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Sample records for aceite combustible residual

  1. Decrease of noxious emissions in the residual fuel oil combustion; Disminucion de emisiones nocivas en la combustion de aceite combustible residual

    Energy Technology Data Exchange (ETDEWEB)

    Mandoki W, Jorge [Econergia S. de R. L. de C. V. Mexico, D. F. (Mexico)

    1994-12-31

    achieved. [Espanol] La combustion de aceite combustible residual emite sustancias nocivas como particulas carbonaceas, oxidos de nitrogeno y trioxido de azufre, a niveles inadmisibles. Agua emulsionada en el combustible reduce sustancialmente dichas emisiones, lograndose ademas, en la mayoria de los casos, un ahorro neto en el consumo de combustible. Se muestran los efectos beneficos de quemar el aceite combustible residual en forma de emulsion, asi como el metodo para producir una emulsion adecuada. La tecnologia del combustible emulsionado ofrece una opcion de bajo costo para reducir la contaminacion atmosferica. La calidad del aceite combustible residual ha estado declinando durante las ultimas decadas debido: 1. Al aumento en la produccion de petroleos crudos pesados generalmente con mayor contenido de asfaltenos y de azufre. 2. A menor disponibilidad de residuos de la destilacion al vacio debido a su conversion a productos de mayor valor. 3. A procesos de conversion mas intensivos, como cracking catalitico, {sup v}isbreaking{sup ,} etc., que aumentan la concentracion de asfaltenos en los fondos, ocasionando problemas de inestabilidad. 4. Al aumento en el contenido de vanadio y de otros metales a medida que aumenta la concentracion de asfaltenos. El uso de aceite combustible emulsionado proporciona un medio eficaz y economico para reducir sustancialmente las emisiones nocivas a la atmosfera. La emulsion contiene particulas de agua de un diametro entre 2 y 20 micras, dispersadas uniformemente dentro del aceite combustible, en una proporcion generalmente enter 5 y 10%; ademas contiene un agente tensioactivo para asegurar una emulsion estable, capaz de resistir los esfuerzos cortantes del sistema de bombeo y distribucion. Cuando las gotas de aceite combustible atomizado llegan a la camara de combustion, el agua esmulsionada en ellas se convierte instantaneamente en vapor de alta presion, ocasionando una violenta atomizacion secundaria. El efecto de esta atomizacion

  2. Decrease of noxious emissions in the residual fuel oil combustion; Disminucion de emisiones nocivas en la combustion de aceite combustible residual

    Energy Technology Data Exchange (ETDEWEB)

    Mandoki W, Jorge [Econergia S. de R. L. de C. V. Mexico, D. F. (Mexico)

    1994-12-31

    achieved. [Espanol] La combustion de aceite combustible residual emite sustancias nocivas como particulas carbonaceas, oxidos de nitrogeno y trioxido de azufre, a niveles inadmisibles. Agua emulsionada en el combustible reduce sustancialmente dichas emisiones, lograndose ademas, en la mayoria de los casos, un ahorro neto en el consumo de combustible. Se muestran los efectos beneficos de quemar el aceite combustible residual en forma de emulsion, asi como el metodo para producir una emulsion adecuada. La tecnologia del combustible emulsionado ofrece una opcion de bajo costo para reducir la contaminacion atmosferica. La calidad del aceite combustible residual ha estado declinando durante las ultimas decadas debido: 1. Al aumento en la produccion de petroleos crudos pesados generalmente con mayor contenido de asfaltenos y de azufre. 2. A menor disponibilidad de residuos de la destilacion al vacio debido a su conversion a productos de mayor valor. 3. A procesos de conversion mas intensivos, como cracking catalitico, {sup v}isbreaking{sup ,} etc., que aumentan la concentracion de asfaltenos en los fondos, ocasionando problemas de inestabilidad. 4. Al aumento en el contenido de vanadio y de otros metales a medida que aumenta la concentracion de asfaltenos. El uso de aceite combustible emulsionado proporciona un medio eficaz y economico para reducir sustancialmente las emisiones nocivas a la atmosfera. La emulsion contiene particulas de agua de un diametro entre 2 y 20 micras, dispersadas uniformemente dentro del aceite combustible, en una proporcion generalmente enter 5 y 10%; ademas contiene un agente tensioactivo para asegurar una emulsion estable, capaz de resistir los esfuerzos cortantes del sistema de bombeo y distribucion. Cuando las gotas de aceite combustible atomizado llegan a la camara de combustion, el agua esmulsionada en ellas se convierte instantaneamente en vapor de alta presion, ocasionando una violenta atomizacion secundaria. El efecto de esta atomizacion

  3. El biodiesel de aceite de higuerilla como combustible alternativo para motores diesel

    Directory of Open Access Journals (Sweden)

    ALIRIO BENAVIDES

    2007-01-01

    Full Text Available En este artículo se presenta un estudio experimental sobre la producción y utilización del biodiesel de aceite de higuerilla. El máximo rendimiento de metilésteres en la reacción de transesterificación del aceite de higuerilla usado se obtiene bajo las siguientes condiciones: temperatura ambiente, una relación molar metanol/aceite de 9 y una concentración de catalizador de 0.8%. El biodiesel de aceite de higuerilla puede ser mezclado con el combustible diesel convencional derivado del petróleo en proporciones hasta del 15%, sin que la mezcla resultante se salga de las especificaciones de calidad estipuladas en los estándares nacionales e internacionales para combustibles diesel. La mayor dificultad para el uso del biodiesel de aceite de higuerilla en motores es su alta viscosidad. Sin embargo este biocombustible presenta excelentes propiedades de flujo a baja temperatura (valores bajos para los puntos de nube y fluidez. Las pruebas en motor con mezclas biodiesel de higuerilla/diesel convencional, en el rango de proporciones de biodiesel ensayadas, muestran que ha medida que se incrementa la proporción de biodiesel en la mezcla aumenta el consumo específico de combustible, disminuye el dosado relativo, la opacidad de humos se disminuye levemente, mientras que el rendimiento efectivo y las emisiones de CO y CO2 prácticamente permanecen constantes

  4. Caracterización de biodiesel obtenido de aceite residual de cocina

    OpenAIRE

    Betselene Murcia Ordoñez; Luis Carlos Chaves; Wilson Rodríguez-Pérez; Miguel Andredy Murcia; Edna Rocío Alvarado

    2013-01-01

    Título corto: Biodiesel de aceite residual de cocina Título en ingles: "Characterization of Biodiesel obtained from waste cooking oil" Resumen Se realizó un análisis físico y químico a cada uno de los siguientes tipos de aceite: desechado proveniente de asaderos de pollo, usado de hogares y fresco adquirido en el mercado local de la ciudad de Florencia, Caquetá (Colombia). Se evaluaron los siguientes parámetros: Peso específico, índice de yodo, índice de saponificación, índice de refracción, ...

  5. Caracterización de biodiesel obtenido de aceite residual de cocina

    Directory of Open Access Journals (Sweden)

    Betselene Murcia Ordoñez

    2013-06-01

    Full Text Available Título corto: Biodiesel de aceite residual de cocina Título en ingles: "Characterization of Biodiesel obtained from waste cooking oil" Resumen Se realizó un análisis físico y químico a cada uno de los siguientes tipos de aceite: desechado proveniente de asaderos de pollo, usado de hogares y fresco adquirido en el mercado local de la ciudad de Florencia, Caquetá (Colombia. Se evaluaron los siguientes parámetros: Peso específico, índice de yodo, índice de saponificación, índice de refracción, humedad y materia volátil, punto de fusión, impurezas insolubles, índice de acidez, coeficiente específico de extinción valores K232 y K270, color y prueba de Kreiss. Igualmente se evaluaron los espectros UV-VIS de los tres tipos de aceite estudiados. Se ensayaron siete diferentes tipos de catalizadores para la reacción de transesterificación manteniendo en todos los casos la proporción de catalizador: aceite 38:190 (v/v, tiempo de reacción (2h y temperatura de reacción (60°C. Se lograron rendimientos de biodiesel de 75.8% de aceite desechado usando KOH 1,269%p/v/MeOH 99%; 87.50% de aceite usado con KOH 0,537%p/v/MeOH 99% y 86.60% de aceite fresco usando KOH 0,457%p/v/MeOH 99%. Al biodiesel obtenido en cada caso se le determinó peso específico, índice de refracción, humedad y materia volátil, cenizas sulfatadas, carbón residual, corrosión a la lámina de cobre y perfil de ácidos grasos. En todos los casos hubo predominio de ácido  palmítico, ácido  oléico y ácido  esteárico en los aceites usados y desechados. Del análisis por cromatografía de gases acoplada a espectrometría de masas se pudo establecer que el contenido total de ésteres metílicos de ácidos  grasos es del 98,38% para el biodiesel de aceite desechado; 99,53% para el biodiesel de aceite usado y 97, 69% para el biodiesel de aceite fresco. Palabras clave: aceite residual de cocina; biodiesel; ácidos grasos; transesterificación Abstract Aphysical and

  6. Biorremediación de un suelo agrícola impactado con aceite residual automotriz

    OpenAIRE

    Pasaye Anaya, Lizbeth

    2011-01-01

    El aceite residual automotriz (ARA) derivado del uso de automotores es una mezcla de hidrocarburos (HC) alifáticos, aromáticos y otros que en el suelo impide la actividad microbiana para el reciclaje de elementos esenciales para la vida. El objetivo de este trabajo fue analizar la biorremediación (BR) por bioestimulación (BS) de un suelo agrícola impactado con ARA. Para ello, el suelo contaminado con la mezcla de HC se biorremedió por BS con una solución mineral (SM), lombricomposta (LC) y ab...

  7. Fluidised-bed combustion of gasification residue

    Energy Technology Data Exchange (ETDEWEB)

    Korpela, T.; Kudjoi, A.; Hippinen, I.; Heinolainen, A.; Suominen, M.; Lu Yong [Helsinki Univ. of Technology (Finland). Lab of Energy Economics and Power Plant Engineering

    1996-12-01

    Partial gasification processes have been presented as possibilities for future power production. In the processes, the solid materials removed from a gasifier (i.e. fly ash and bed material) contain unburnt fuel and the fuel conversion is increased by burning this gasification residue either in an atmospheric or a pressurised fluidised-bed. In this project, which is a part of European JOULE 2 EXTENSION research programme, the main research objectives are the behaviour of calcium and sulphur compounds in solids and the emissions of sulphur dioxide and nitrogen oxides (NO{sub x} and N{sub 2}O) in pressurised fluidised-bed combustion of gasification residues. (author)

  8. Caracterización química del aceite y harina residual de solanum sisymbriifolium lam

    Directory of Open Access Journals (Sweden)

    Wiese, B.

    2001-04-01

    Full Text Available Seeds from Solanum sisymbriifolium Lam harvested at Olavarría (Buenos Aires, Argentine were defatted with hexane and the raw oil obtained with a yield of 20,6 % dry basis. The physicochemical characteristics of crude oil were: refractive index: 1,4610 (at 25ºC, iodine value: 112,8; saponification index: 170,0; unsaponifiable matter: 14,0 % and free fatty acid content: 2,4 (mg KOH/g. The fatty acid composition of seed oil was studied by gas-liquid chromatography. Major fatty acids of seed oil were: linoleic (52,3%, oleic (23,4 % and palmitic acid (16,4 %. The residual seed meal contained moderate level of crude protein (14,75%, dry basis, low level of available lysine (2,25 g/16gN and high content of crude fiber (51,5%, dry basis. Total and phytic acid phosphorous, calcium, ash, sugar and polysaccharides contents are reported.Semillas de Solanum sisymbriifolium Lam cosechadas en Olavarría (prov. de Buenos Aires, Argentina se trataron con hexano (soxhlet obteniéndose el aceite crudo (rendimiento:20,6% y la harina residual de extracción. Las características fisicoquímicas del aceite crudo fueron: Índice de refracción: 1.4610 (a 25ºC; Índice de iodo: 112,8; Índice de saponificación: 170,0; Insaponificable: 14,0%, Índice de acidez: 2,4 (mgKOH/g. Se determinó la composición acídica del aceite por cromatografía gas-líquido. Los ácidos grasos mayoritarios fueron: ácido linoleico (52,3%, ácido oleico (23,4% y ácido palmítico (16,4%. La harina residual de extracción contenía una moderada proporción de proteína cruda (14,75% b.s, baja proporción de lisina disponible (2,25 g/16gN y un alto contenido de fibra cruda (51,5 %b.s. Se informan valores de fósforo total y de ácido fítico, cenizas, calcio e hidratos de carbono.

  9. Aceite(s) remisión de V. expresoria de aceite(s).

    OpenAIRE

    2011-01-01

    [ES] Definición del término Aceite(s) remisión de V. expresoria de aceite(s). en el diccionario Dicter. [EN] Definition of the word Aceite(s) remisión de V. expresoria de aceite(s). in the dictionary Dicter.

  10. Estudios sobre semilla de Hypochaeris variegata L. (Baker: aceite seminal y harina residual de extracción

    Directory of Open Access Journals (Sweden)

    Nolasco, S. M.

    2000-08-01

    Full Text Available Seeds from Hypochaeris variegata L. (Baker harvested at Olavarría (Buenos Aires, Argentine were defatted with hexane and the raw oil obtained with a yield of 24,7% dry basis. The crude oil was examined in their physicochemical characteristics had refractive index of 1,4637 (at 25ºC, iodine value of 125,2, saponification index of 188,4, unsaponifiable matter of 8,5 % and free fatty acid content of 9,7 (mg KOH/g. Gas chromatographic analysis of the oil revealed high levels of linoleic acid (66,2%, appreciable amount of linolenic and erucic acids. The residual seed meal contained 35,49% of crude protein and 35,1% of crude fiber. Total and phytic acid phosphorous, calcium, ash, sugar and polisaccharides (non presence of starch contents are reported.Semillas de Hypochaeris variegata L. (Baker cosechadas en Olavarría (prov. de Buenos Aires, Argentina se extrajeron con hexano (soxhlet obteniéndose el aceite crudo con un rendimiento del 24,7 % (b.s. y la harina residual de extracción. El aceite crudo se examinó en sus características fisicoquímicas (Indice de refracción: 1.4637 (a 25ºC, Indice de iodo: 125,2, Indice de saponificación: 188,4, insaponificable: 8,5%, Indice de acidez: 9,7 (mgKOH/g y composición acídica. El análisis por cromatografía gaseosa de los ésteres metílicos revela un alto porcentaje de ácido linoleico (66,2%, cantidades apreciables de ácido linolénico y erúcico. La harina residual de extracción presentó un 35,49% b.s. de proteína cruda y 35,1% b.s. de fibra cruda. Se informan valores de fósforo total y de ácido fítico, cenizas, calcio e hidratos de carbono.

  11. 75 FR 64974 - Notice of Data Availability on Coal Combustion Residual Surface Impoundments

    Science.gov (United States)

    2010-10-21

    ... Coal Combustion Residual Surface Impoundments AGENCY: Environmental Protection Agency (EPA). ACTION... of Coal Combustion Residuals from Electric Utilities. The Agency is seeking public comment on how, if...; Disposal of Coal Combustion Residuals From Electric Utilities Docket, Attention Docket ID No.,...

  12. Unburned carbon in combustion residues from mainly solid biofuels

    Energy Technology Data Exchange (ETDEWEB)

    Bjurstroem H; Lind B; Lagerkvist A

    2012-02-15

    Unburned carbon in 21 combustion residues from solid biofuels is investigated using several methods of analysis (a.o. LOI and TOC), as well as micro-Raman spectroscopy. The results are used to discuss the distribution of unburned carbon in the residues from the different combustion plants and its nature (organic or elemental). The consequences of the elemental nature of carbon for environmental properties of the residue are noted

  13. Study on combustion characteristics of petroleum coke residual oil slurry

    Energy Technology Data Exchange (ETDEWEB)

    Shou Weiyi; Xu Xiaoming; Cao Xinyu [and others

    1997-07-01

    Petroleum coke residual oil slurry (POS) is one of prospect substitute of oil burned in many industrial boilers and utilities in China. It is a mixture of pulverized petroleum coke, residual oil and slurry oil. We carried out a series of experiments to study its ignition and combustion mechanism. Experimental results show that the ignition temperature of petroleum coke is higher than normal anthracite and meager coal, and it is difficult to be burned in oil-fired furnace directly. The petroleum coke`s combustion property is improved greatly after mixing with residual oil and slurry oil. The combustion process of POS can be divided into three phases: preheating, kindling and homogenous combustion, burning of the petroleum coke residue. The combustion condition of POS is close to bituminous and coal-oil-mixture (COM).

  14. Combustion Analysis of Different Olive Residues

    Directory of Open Access Journals (Sweden)

    Antonio Ruiz

    2008-04-01

    Full Text Available The Thermogravimetric Analysis (TGA techniques and concretely the study of the burning profile provide information that can be used to estimate the behaviour of the combustion of carbonous materials. Commonly, these techniques have been used for the study of carbons, but are also interesting for the analysis of biomass wastes, due to the different species present on the wastes affect directly to its thermal properties. In this work, techniques of thermal analysis have been applied to compare the behaviour of different wastes coming from olive oil mills. From these results, it is remarkable that the Concentrated Olive Mill Waste Water (COMWW presents more unfavourable conditions for its combustion.

  15. Combustion properties of biomass residues rich in phosphorus

    Energy Technology Data Exchange (ETDEWEB)

    Piotrowska, P.

    2012-07-01

    The currently-used sources of biomass are limited so new ones are required in order to meet the European Union target and to satisfy the constantly-increasing demand for energy. This is why energy recovery from residues or waste derived fuels has been given considerable attention over recent years. The residues generated during the production of biofuels for transportation are often the main stream from the production plant. Proper allocation of the residues could significantly improve the sustainability of the production process resulting in high greenhouse gas emission savings and improvement in their profitability. Energy recovery could be one application, among others, for the residues. The objective of this study was to investigate the combustion behaviour of four residues from the production of biofuels for transportation. The residues of interest were: rapeseed cake, palm kernel cake, dried distillers' grains with solubles, and fermented sewage sludge. A wide range of methods of laboratory to semi-industrial scale was applied in order to define the main challenges, related to the fluidized bed combustion of these residues. All residues were characterized by means of laboratory methods. The residues differ substantially in their composition compared to more traditional biomass fuels. Their common property is a high concentration of phosphorus. Until recently, phosphorus was considered a negligible element for ash chemistry due to its low concentrations. Rapeseed cake was further studied, as an example of phosphorus-rich fuel, during bench-scale bubbling fluidized bed (BFB) and semi-industrial scale circulating fluidized bed (CFB) combustion experiments. Rapeseed cake, with phosphorus and alkali metals dominating its ash chemistry, led to defluidization at approximately 800 deg C. Bed sintering during fluidized bed combustion of pure rapeseed cake followed a non-reactive mechanism. This mechanism is controlled by the stickiness of fuel-derived ash

  16. Residual velocities in combustion experiments on board of sounding rockets

    Science.gov (United States)

    Juste, G. L.

    1996-12-01

    Most combustion experiments on microgravity conditions require extensive testing time, thus making necessary the use of sounding rockets, satellites and spatial laboratories. Sounding rockets and satellites offer some advantages over spatial laboratories, i.e. less strict safety requirements than those in manned flights, the cost of the experiment is also lower. In combustion experiments, the gas velocities inside test modules must be smaller than the characteristic velocity of the process. The initial spin stabilization of sounding rockets has been identified as a possible origin of residual velocities inside the aforementioned modules. The object of the present work is to study the gas residual velocity in the module designed by SENER for carrying out of combustion experiments in microgravity conditions in sounding rockets. Particle image velocimetry was used to measure these velocities. The study shows that, after the spin stabilization, a rapid slowing down of such velocities is produced, decreasing by 5 mm/s after 10 s and down to 0.1 mm/s after 40 s.

  17. Thermogravimetric investigation of the co-combustion between the pyrolysis oil distillation residue and lignite.

    Science.gov (United States)

    Li, Hao; Xia, Shuqian; Ma, Peisheng

    2016-10-01

    Co-combustion of lignite with distillation residue derived from rice straw pyrolysis oil was investigated by non-isothermal thermogravimetric analysis (TGA). The addition of distillation residue improved the reactivity and combustion efficiency of lignite, such as increasing the weight loss rate at peak temperature and decreasing the burnout temperature and the total burnout. With increasing distillation residue content in the blended fuels, the synergistic interactions between distillation residue and lignite firstly increased and then decreased during co-combustion stage. Results of XRF, FTIR, (13)C NMR and SEM analysis indicated that chemical structure, mineral components and morphology of samples have great influence on the synergistic interactions. The combustion mechanisms and kinetic parameters were calculated by the Coats Redfern model, suggesting that the lowest apparent activation energy (120.19kJ/mol) for the blended fuels was obtained by blending 60wt.% distillation residue during main co-combustion stage.

  18. FINE PARTICLE EMISSIONS FROM RESIDUAL FUEL OIL COMBUSTION: CHARACTERIZATION AND MECHANISMS OF FORMATION

    Science.gov (United States)

    The paper gives results of a comparison of the characteristics of particulate matter (PM) emitted from residual fuel oil combustion in two types of combustion equipment. A small commercial 732-kW fire-tube boiler yielded a weakly bi-modal particulate size distribution (PSD) with...

  19. Co-combustion of agricultural residues with coal in a fluidized bed combustor.

    Science.gov (United States)

    Ghani, W A W A K; Alias, A B; Savory, R M; Cliffe, K R

    2009-02-01

    Power generation from biomass is an attractive technology that utilizes agricultural residual waste. In order to explain the behavior of biomass-fired fluidized bed incinerator, biomass sources from agricultural residues (rice husk and palm kernel) were co-fired with coal in a 0.15m diameter and 2.3m high fluidized bed combustor. The combustion efficiency and carbon monoxide emissions were studied and compared with those for pure coal combustion. Co-combustion of a mixture of biomass with coal in a fluidized bed combustor designed for coal combustion increased combustion efficiency up to 20% depending upon excess air levels. Observed carbon monoxide levels fluctuated between 200 and 900 ppm with the addition of coal. It is evident from this research that efficient co-firing of biomass with coal can be achieved with minimal modifications to existing coal-fired boilers.

  20. Management of high sulfur coal combustion residues, issues and practices: Proceedings

    Energy Technology Data Exchange (ETDEWEB)

    Chugh, Y.P.; Beasley, G.A. [eds.

    1994-10-01

    Papers presented at the following sessions are included in this proceedings: (1) overview topic; (2) characterization of coal combustion residues; (3) environmental impacts of residues management; (4) materials handling and utilization, Part I; and (5) materials handling and utilization, Part II. Selected paper have been processed separately for inclusion in the Energy Science and Technology Database.

  1. Major leaching processes of combustion residues - Characterisation, modelling and experimental investigation

    Energy Technology Data Exchange (ETDEWEB)

    Yan Jinying

    1998-12-31

    Characterising leaching behaviour provides ample evidence to identify the major leaching processes of combustion residues. Neutralisation and chemical weathering govern the leaching reactions and control the release of elements from combustion residues, and are thus considered to be the major leaching processes. According to experimental investigations and geochemical simulations, the leaching kinetics of buffering materials are key issues for the understanding of the neutralizing processes. The acid neutralizing capacity at different pH levels depends mainly on the mineralogy of the combustion residues. In combustion residues, the dissolution of glass phases is expected to play an important role in a long-term neutralizing process. The neutralizing process in a flow system is significantly different from that in a batch system. The neutralizing ability of a combustion residue may be strongly affected by solute transport and carbonation reactions in a natural leaching environment. The chemical weathering mainly involves the matrix of combustion residues consisting mostly of glass phases. The dissolution kinetics of waste glass and other possible processes involved in the chemical weathering have been investigated and incorporated into a kinetic reactive transport model. Most important processes in the chemical weathering can be simulated simultaneously using this model. The results show that there is a complicated relationship between the factors controlling the long-term chemical weathering. The environmental impact of the glass dissolution cannot be neglected. Although the glass dissolution provides considerable buffering capacity in long-term weathering, the carbonate is usually a dominant buffering mineral in actual weathering processes. The transformation of carbonate should be considered as an important process in the chemical weathering. The formation of secondary minerals may considerably alter the mineralogy of the waste, and thus change the leaching

  2. Characterizing the Leaching Behavior of Coal Combustion Residues using the Leaching Environmental Assessment Framework (LEAF) to Inform Future Management Decisions

    Science.gov (United States)

    Abstract for presentation on Characterizing the Leaching Behavior of Coal Combustion Residues using the Leaching Environmental Assessment Framework (LEAF) to Inform Future Management Decisions. The abstract is attached.

  3. Characterization, leachability and valorization through combustion of residual chars from gasification of coals with pine.

    Science.gov (United States)

    Galhetas, Margarida; Lopes, Helena; Freire, Márcia; Abelha, Pedro; Pinto, Filomena; Gulyurtlu, Ibrahim

    2012-04-01

    This paper presents the study of the combustion of char residues produced during co-gasification of coal with pine with the aim of characterizing them for their potential use for energy. These residues are generally rich in carbon with the presence of other elements, with particular concern for heavy metals and pollutant precursors, depending on the original fuel used. The evaluation of environmental toxicity of the char residues was performed through application of different leaching tests (EN12457-2, US EPA-1311 TCLP and EA NEN 7371:2004). The results showed that the residues present quite low toxicity for some of pollutants. However, depending on the fuel used, possible presence of other pollutants may bring environmental risks. The utilization of these char residues for energy was in this study evaluated, by burning them as a first step pre-treatment prior to landfilling. The thermo-gravimetric analysis and ash fusibility studies revealed an adequate thermochemical behavior, without presenting any major operational risks. Fluidized bed combustion was applied to char residues. Above 700°C, very high carbon conversion ratios were obtained and it seemed that the thermal oxidation of char residues was easier than that of the coals. It was found that the char tendency for releasing SO(2) during its oxidation was lower than for the parent coal, while for NO(X) emissions, the trend was observed to increase NO(X) formation. However, for both pollutants the same control techniques might be applied during char combustion, as for coal. Furthermore, the leachability of ashes resulting from the combustion of char residues appeared to be lower than those produced from direct coal combustion.

  4. Stabilization of Rocky Flats combustible residues contaminated with plutonium metal and organic solvents

    Energy Technology Data Exchange (ETDEWEB)

    Bowen, S.M.; Cisneros, M.R.; Jacobson, L.L.; Schroeder, N.C.; Ames, R.L.

    1998-09-30

    This report describes tests on a proposed flowsheet designed to stabilize combustible residues that were generated at the Rocky Flats Environmental Technology Site (RFETS) during the machining of plutonium metal. Combustible residues are essentially laboratory trash contaminated with halogenated organic solvents and plutonium metal. The proposed flowsheet, designed by RFETS, follows a glovebox procedure that includes (1) the sorting and shredding of materials, (2) a low temperature thermal desorption of solvents from the combustible materials, (3) an oxidation of plutonium metal with steam, and (4) packaging of the stabilized residues. The role of Los Alamos National Laboratory (LANL) in this study was to determine parameters for the low temperature thermal desorption and steam oxidation steps. Thermal desorption of carbon tetrachloride (CCl{sub 4}) was examined using a heated air stream on a Rocky Flats combustible residue surrogate contaminated with CCl{sub 4}. Three types of plutonium metal were oxidized with steam in a LANL glovebox to determine the effectiveness of this procedure for residue stabilization. The results from these LANL experiments are used to recommend parameters for the proposed RFETS stabilization flowsheet.

  5. Emission factors of gaseous carbonaceous species from residential combustion of coal and crop residue briquettes

    Institute of Scientific and Technical Information of China (English)

    Qin WANG; Chunmei GENG; Sihua LU; Wentai CHEN; Min SHAO

    2013-01-01

    Experiments were performed to measure the emission factors (EFs) of gaseous carbonaceous species, such as CO2, CO, CH4, and non-methane volatile organic compounds (NMVOCs), from the combustion of five types of coal of varying organic maturity and two types of biomass briquettes under residential burning conditions. Samples were collected in stainless steel canisters and 2,4- dinitrophenylhydrazine (DNPH) cartridges and were analyzed by GC FID/MS and HPLC, respectively. The EFs from crop residue briquette burning were generally higher than those from coals, with the exception of CO2. The dominant NMVOC species identified in coal smoke were carbonyls (41.7%), followed by C2 unsaturated hydrocarbons (29.1%) and aromatics (12.1%), while C2 unsaturated hydrocarbons were the dominant species (68.9%) emitted from the combustion of crop residue briquettes, followed by aromatics (14.4%). A comparison of burning normal crop residues in stoves and the open field indicated that briquettes emitted a larger proportion of ethene and acetylene. Both combustion efficiency and coal organic maturity had a significant impact on NMVOC EFs from burning coal: NMVOC emissions increased with increasing coal organic maturity but decreased as the combustion efficiency improved. Emissions from the combustion of crop residue briquettes from stoves occurred mainly during the smoldering process, with low combustion efficiency. Therefore, an improved stove design to allow higher combustion efficiency would be beneficial for reducing emissions of carbonaceous air pollutants.

  6. Aceite de Sacha Inchi

    OpenAIRE

    Espol; Pino Avegno, Gustavo Daniel; Urgilés Tapia, Victor Oswaldo; Villacreses León, Paúl Fabricio

    2015-01-01

    El aceite de Sacha Inchi extraído de la palnta del mismo nombre, es utilizado como aceite de aderezo y cuya propiedad mas importante recae sobre su 48% de omega 3, a diferencia del 1% que contiene el tradicional aciete de Oliva. dentro de las propiedades benéficas del Omega 3 se encuentran la reduccion del colesterol malo, reducción de triglicéridos, disminución de riesgo de hipertensión entre otros. Guayaquil Magíster en Administración de Empresas

  7. Clean coal combustion: development of clean combustion technologies for residual fuels

    Energy Technology Data Exchange (ETDEWEB)

    Montiel, M.F. [Electric Research Institute, Cuernavaca (Mexico)

    2003-07-01

    Most of the large quantities of heavy fuel oil (about 4% sulphur-content) produced in Mexican refineries are burned in power plants. More natural gas is being used, and it is estimated that by 2010, about one-third of Mexico's electricity will be produced from natural gas. As petroleum and gas reserves are depleted, power plants will consume more imported coal. To continue combustion of dirty fuels, advanced clean combustion technologies must be developed. Two feasibility projects were conducted over the period 1989-1995 on combustion of Mexican fuels in a bubbling fluidized combustor and in IGCC power plants. More recent feasibility studies for cogeneration plants in refineries are outlined. Solid fuels for IGCC and CFB are among the most important developments. Over the period 2004-2008, projects to study clean combustion of Mexican fuels will be conducted in the following areas: operational problems in IGCC plants, construction of an entrained flow gasifier for synthesis gas production and for feeding of heavy fuels and coal emulsions, and development of CFD (computational fluid dynamics) models.

  8. Effects of fluidized bed combustion residue on pecan seedling growth and nutrient content. [Carya illinoensis

    Energy Technology Data Exchange (ETDEWEB)

    Edwards, J.H.; White, A.W. Jr.; Bennett, O.L.

    1985-01-01

    Fluidized bed combustion residue from a calcitic limestone source (FBCRC), a by-product of scrubbing SO/sub 2/ from fossil fuel fired boilers using the FBC technique was evaluated as a source of calcium for pecan (Carya illinoensis (Wang.) K. Koch) seedlings. Fluidized bed combustion residue produced following injection of calcitic limestone into the combustion chamber was more effective in neutralizing soil acidity and increasing extractable soil Ca levels than agricultural calcitic limestone. The Ca concentration in the pecan leaves was increased linearly by Ca rates for both 12- and 24-week growth periods, but stem and petiole Ca concentration was increased linearly for the second 12-week growth period. Macronutrient concentrations were affected by Ca rates for both 12- and 24-week growth periods, but no effect was observed with Ca source. The primary difference was between the control and all other Ca rates.

  9. Characterization of Coal Combustion Residues from Electric Utilities Using Wet Scrubbers for Multi-Pollutant Control

    Science.gov (United States)

    This report evaluates changes that may occur to coal combustion residues (CCRs) in response to changes in air pollution control technology at coal-fired power plants, which will reduce emissions from the flue gas stack by transferring pollutants to fly ash and other air pollution...

  10. Chemical analysis of solid residue from liquid and solid fuel combustion: Method development and validation

    Energy Technology Data Exchange (ETDEWEB)

    Trkmic, M. [University of Zagreb, Faculty of Mechanical Engineering and Naval Architecturek Zagreb (Croatia); Curkovic, L. [University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb (Croatia); Asperger, D. [HEP-Proizvodnja, Thermal Power Plant Department, Zagreb (Croatia)

    2012-06-15

    This paper deals with the development and validation of methods for identifying the composition of solid residue after liquid and solid fuel combustion in thermal power plant furnaces. The methods were developed for energy dispersive X-ray fluorescence (EDXRF) spectrometer analysis. Due to the fuels used, the different composition and the location of creation of solid residue, it was necessary to develop two methods. The first method is used for identifying solid residue composition after fuel oil combustion (Method 1), while the second method is used for identifying solid residue composition after the combustion of solid fuels, i. e. coal (Method 2). Method calibration was performed on sets of 12 (Method 1) and 6 (Method 2) certified reference materials (CRM). CRMs and analysis test samples were prepared in pellet form using hydraulic press. For the purpose of method validation the linearity, accuracy, precision and specificity were determined, and the measurement uncertainty of methods for each analyte separately was assessed. The methods were applied in the analysis of real furnace residue samples. (Copyright copyright 2012 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

  11. The atomization and the flame structure in the combustion of residual fuel oils; La atomizacion y estructura de flama en la combustion de combustibles residuales

    Energy Technology Data Exchange (ETDEWEB)

    Bolado Estandia, Ramon [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1985-12-31

    In this article a research on the combustion of heavy residual fuel oils is presented. The type of flames studied were obtained by means of the burning of sprays produced by an atomizer designed and calibrated specially for the research purpose. The flame characteristics that were analyzed are its length, its luminosity, the temperature, the distribution of the droplets size and mainly the burning regime of the droplets in the flame. The experimental techniques that were used for these studies were shadow micro-photography, suction pyrometry and of total radiation, laser diffraction, 35 mm photography, and impact push. The analysis of the experimental results, together with the results of the application of a mathematical model, permitted to establish two parameters, that quantitatively related determine the burning regime of the droplets in a flame of sprays of residual heavy fuel oil. [Espanol] En este articulo se presenta una investigacion sobre la combustion de combustibles residuales pesados. El tipo de flamas estudiadas se obtuvieron mediante el quemado de sprays producidos por un atomizador disenado y calibrado especialmente para el proposito de la investigacion. Las caracteristicas de flama que se analizaron son la longitud, la luminosidad, la temperatura, la distribucion de tamano de gotas y, principalmente, el regimen de quemado de gotas en la flama. Las tecnicas experimentales que se usaron para estos estudios fueron microfotografia de sombras, pirometria de succion y de radiacion total, difraccion laser, fotografia de 35 mm y empuje de impacto. El analisis de resultados experimentales, junto con los resultados de la aplicacion de un modelo matematico, permitio establecer dos parametros, que relacionados cuantitativamente, determinan el regimen de quemado de gotas en una flama de sprays de combustible residual pesado.

  12. Solubility analysis and disposal options of combustion residues from plants grown on contaminated mining area.

    Science.gov (United States)

    Kovacs, Helga; Szemmelveisz, Katalin; Palotas, Arpad Bence

    2013-11-01

    Biomass, as a renewable energy source, is an excellent alternative for the partial replacement of fossil fuels in thermal and electric energy production. A new fuel type as biomass for energy utilisation includes ligneous plants with considerable heavy metal content. The combustion process must be controlled during the firing of significant quantities of contaminated biomass grown on brownfield lands. By implementing these measures, air pollution and further soil contamination caused by the disposal of the solid burning residue, the ash, can be prevented. For the test samples from ligneous plants grown on heavy metal-contaminated fields, an ore mine (already closed for 25 years) was chosen. With our focus on the determination of the heavy metal content, we have examined the composition of the soil, the biomass and the combustion by-products (ash, fly ash). Our results confirm that ash resulting from the combustion must be treated as toxic waste and its deposition must take place on hazardous waste disposal sites. Biomass of these characteristics can be burnt in special combustion facility that was equipped with means for the disposal of solid burning residues as well as air pollutants.

  13. Effect of water blending on bioethanol HCCI combustion with forced induction and residual gas trapping

    Energy Technology Data Exchange (ETDEWEB)

    Megaritis, A. [Mechanical Engineering, School of Engineering and Design, Brunel University, West London, Uxbridge UB8 3PH (United Kingdom); Yap, D. [Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, Singapore 638075 (Singapore); Wyszynski, M.L. [Mechanical and Manufacturing Engineering, School of Engineering, University of Birmingham, Birmingham B15 2TT (United Kingdom)

    2007-12-15

    There is increased interest worldwide in renewable engine fuels as well as in new combustion technologies. Bioethanol is one of the alternative fuels that have been used successfully in spark ignition engines. A combustion technology that currently attracts a lot of interest is the homogeneous charge compression ignition (HCCI) combustion, which has shown potential for low nitrogen oxides emissions with no particulate matter formation. The authors have shown previously that applying forced induction to bioethanol HCCI with residual gas trapping results in an extended load range compared to naturally aspirated operation. However, at high boost pressures, high cylinder pressure rise rates develop. Work by other researchers has shown that direct injection of water can be used as a combustion control method. The present work explores water blending as a way that might have an effect on combustion in order to lower the maximum pressure rise rates and further improve emissions. The obtained experimental results show that in contrast to variable rate direct injection of water, fixed rate water-ethanol blending is counterproductive for the reduction of pressure rise rates at higher loads. In addition, increasing the water content in ethanol results in reduction of the effective load range and increased emissions. (author)

  14. Exploitation of a siderurgical waste oil in the sintering process; Aprovechamiento de un aceite residual siderurgico en el proceso de sinterizacion

    Energy Technology Data Exchange (ETDEWEB)

    Cores, A.; Formoso, A.; Moro, A.; Maranon, P. [Centro Nacional de Investigaciones Metalurgicas, CSIC, Madrid (Spain)

    1996-06-01

    The exploitation of a waste oil (tinnol) previously used as a lubricant in the rolling process is studied. This waste oil, together with propane, is used as a fuel for the ignition in a sintering pilot plant. Tinnol and propane are simultaneously injected through separate feed lines and the combustion process is monitored by analysis of the levels of O{sub 2} CO and unburnt particles in the gases produced during the first three minutes of sintering. The combustion of tinnol is considered to be effective and its energy contribution to the process is demonstrated by a reduction in the consumption of propane as the rate at which tinnol is injected increases. (Author) 5 refs.

  15. Disposal of residue from sifting of combustible waste; Avsaettning av siktrest fraan foerbehandling av braennbart avfall

    Energy Technology Data Exchange (ETDEWEB)

    Niklasson, Fredrik

    2012-11-01

    In waste to energy plants, unwanted species in the fuel may cause corrosion, deposits, agglomeration in the fuel bed, and emissions of pollutants. Countermeasures to such problems are often costly. For at least some of the waste, the fuel properties can be improved by introducing a pretreatment system in which the fine fraction is separated from the waste by sifting. This method has been studied in an earlier Waste Refinery project, WR-06. That study pointed at advantages in performance of the boiler plant and a rough economical analysis indicated substantial benefits. The drawback of the pretreatment was that the residue (the fine fraction) showed as high content of total organic carbon (TOC) as 37 %, by weight. Such a waste fraction is not allowed to be landfilled in Sweden. High TOC content is also a limiting factor for usage as a secondary construction material. To become an applicable pretreatment method, it is necessary to find an appropriate disposal method for the residue material. Present work investigates different possibilities to handle the sifting residue, assuming it has the same properties as in previous study. The residue from sifting needs further treatment, preferably with energy recovery. There are some alternatives, such as combustion, gasification, anaerobic or aerobic digestion. To reduce problems associated by combustion, the waste may be burnt in another more suitable furnace. An alternative is gasification, but that treatment method is not yet an established process for waste fuels. Another option is treatment by anaerobic or aerobic digestion. The high concentrations of metals, however, limit the use of the biologically treated waste to landfilling sites, where it may be utilized as a construction material. The high metal concentrations in the sifting residue imply that it must be kept separate from other biodegradable wastes which are used to produce fertilizers. Thus, this treatment alternative will likely require substantial new

  16. 可燃药筒对模块装药燃烧残渣的影响%Influence of Combustible Case on Combustion Residue of Modular Charges

    Institute of Scientific and Technical Information of China (English)

    乔丽洁; 堵平; 廖昕; 王泽山

    2011-01-01

    针对某外贸型号火炮模块装药射击时存在燃烧残渣,影响后续装药和连续射击的问题,采用密闭爆发器定容燃烧模拟试验,对模块装药中两种可燃药筒燃烧(缓燃、速燃)后的残渣量进行了测试;同时以药包装药系统为参照系,研究了靶场射击中模块装药可燃药筒的燃烧残渣量,并对试验结果进行了比对.结果表明:近2/3的燃烧残渣是由可燃药筒产生的;增加可燃药筒中的硝化纤维素的含量,减少合成树脂粘合剂和纤维增强材料后,进行靶场射击试验,结果表明模块装药的燃烧残渣总量降低了2/3,基本消除了模块装药的射击残渣问题.%For the problem of combustion residue produced from some modular charge during firing, the residue amounts of two kinds of combustible cases ( slow burning and fast burning) after burning were measured through the closed bomb test. The combustion residue amounts of two combustible cases were also tested in the firing range by taking a bag propelling charge as a reference, and the two residue a-mounts were compared. The results show that near two-thirds combustion residue comes from the combustible case, and the total amount of combustion residue of the modular charge during firing is reduced by two-thirds after the synthetic resin binder and fiber reinforced material are reduced and the nitrocellulose is increased in the improved combustible case. Thus, the combustion residue of modular charge during firing is basically eliminated.

  17. Análisis de calidad de los biogasoleos de aceite de palma e higuerilla.

    OpenAIRE

    Benjumea, Pedronel; Agudelo, Jhon Jairo; Benjamidez, Alirio Yovany

    2011-01-01

    El biodisel es un combustible obtenido a partir de materias primas de base renovable como los aceites vegetales. El objetivo de este trabajo es realizar un análisis de calidad de dos tipos de biodisel obtenidos a partir de materias primas disponibles en Colombia como es el caso de los aceites de palma e higuerilla. El biodisel de aceite de palma cumple con la mayoría de las especificaciones contempladas en las normas ASTM D- 975 y D-6751. La principal deficiencia técnica de este biodisel es e...

  18. Separador de agua y aceite

    OpenAIRE

    Gracia Pérez, Antonio

    2007-01-01

    Este proyecto pretende responder a la demanda actual existente, en relación al reciclaje y la reutilización de los residuos generados por los seres humanos, concretamente para éste caso, el aceite usado (uso doméstico). Actualmente existen máquinas de separación de agua y aceite, pero únicamente de uso industrial. Igualmente existen contenedores de recogida de aceite de uso doméstico, pero éstos no realizan ningún tipo de discriminación entre la naturaleza de las mezclas que se vierten, p...

  19. Geochemistry of Permian Coal and Its Combustion Residues in Huainan Coalfield, China

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    INAA (instrumental neutron activation analysis) was used to determine the contents of trace elements in coal samples from 11 workable Permian coal seams in Huainan coalfield. With XRFS (X-ray fluorescence spectrometry), the geochemical composition of its combustion residues from Tianjiaan Power Plant and Luohe Power Plant was analyzed. In addition, the electron microprobe was employed to study the chemical composition of some fly ashes and bottom ashes. Compared with those of the coals around the world, most trace elements of the Huainan coal are characterized by a normal abundance.Like most coals worldwide, the elements Se, S, As, Sb, Br, U and Cl are enriched in Huainan coal according to Clarks value, while the other elements tend to be diluted. The large fluctuation in the contents of trace elements in this kind of coal demonstrates great differences in coal seams. On the other hand, the contents of these elements are very similar in different bottom and fly ash samples. The elements with low organic affinity tend to concentrate in fly and bottom ash than in coal, especially those elements associated with Fe. However, the elements with strong organic affinity tend to be volatile during the combustion. Moreover, the abundance of the elements in fly ash and bottom ash changes with different densities and with different particle sizes. The bottom and fly ashes consist of glass, lime,mullite, coal residues and ferrite minerals. Some residual chars contain higher contents of volatile elements, such as S, P, Cl and As, indicating that the ash containing more residual chars has a strong adsorption of some hazardous elements, suggesting a possible utilization of power plant ash in the field of water cleaning.

  20. Size distributions of major elements in residual ash particles from coal combustion

    Institute of Scientific and Technical Information of China (English)

    YU DunXi; XU MingHou; YAO Hong; LIU XiaoWei

    2009-01-01

    Combustion experiments for three coals of different ranks were conducted in an electrically-heated drop tube furnace. The size distributions of major elements in the residual ash particles (>0.4μm) such as AI, Si, S, P, Na, Mg, K, Ca and Fe were investigated. The experimental results showed that the concentrations of AI and Si in the residual ash particles decreased with decreasing particle size, while the concentrations of S and P increased with decreasing particle size. No consistent size distributions were obtained for Na, Mg, K, Ca and Fe. The established deposition model accounting for trace element distributions was demonstrated to be applicable to some major elements as well. The modeling results indicated that the size distributions of the refractory elements, AI and Si, were mainly influenced by the deposition of vaporized elements on particle surfaces. A dominant fraction of S and P vaporized during coal combustion. Their size distributions were determined by surface condensation, reaction or adsorption. The partitioning mechanisms of Na, Mg, K, Ca and Fe were more complex.

  1. Combustion reaction kinetics of guarana seed residue applying isoconversional methods and consecutive reaction scheme.

    Science.gov (United States)

    Lopes, Fernanda Cristina Rezende; Tannous, Katia; Rueda-Ordóñez, Yesid Javier

    2016-11-01

    This work aims the study of decomposition kinetics of guarana seed residue using thermogravimetric analyzer under synthetic air atmosphere applying heating rates of 5, 10, and 15°C/min, from room temperature to 900°C. Three thermal decomposition stages were identified: dehydration (25.1-160°C), oxidative pyrolysis (240-370°C), and combustion (350-650°C). The activation energies, reaction model, and pre-exponential factor were determined through four isoconversional methods, master plots, and linearization of the conversion rate equation, respectively. A scheme of two-consecutive reactions was applied validating the kinetic parameters of first-order reaction and two-dimensional diffusion models for the oxidative pyrolysis stage (149.57kJ/mol, 6.97×10(10)1/s) and for combustion stage (77.98kJ/mol, 98.611/s), respectively. The comparison between theoretical and experimental conversion and conversion rate showed good agreement with average deviation lower than 2%, indicating that these results could be used for modeling of guarana seed residue.

  2. Physical and chemical characterisation of crude meat and bone meal combustion residue: "waste or raw material?".

    Science.gov (United States)

    Deydier, Eric; Guilet, Richard; Sarda, Stéphanie; Sharrock, Patrick

    2005-05-20

    As a result of the recent bovine spongiform encephalopathy (BSE) crisis in the European beef industry, the use of animal by-product is now severely controlled. Meat and bone meal (MBM) production can no longer be used to feed cattle and must be safely disposed of or transformed. Main disposal option is incineration, producing huge amounts of ashes the valorisation of which becomes a major concern. The aim of this work is to characterise MBM combustion residue in order to evaluate their physical and chemical properties to propose new valorisation avenues. The thermal behaviour of crude meat and bone meal was followed by thermogravimetric analysis (TGA) and (24 wt.%) inorganic residue was collected. The resulting ashes were characterised by powder X-ray diffraction (XRD), particle size distribution, specific surface area (BET), scanning electron microscopy (SEM) couple with energy disperse X-ray analysis (EDX). Elemental analysis revealed the presence of chloride, sodium, potassium, magnesium with high level of phosphate (56 wt.%) and calcium (31 wt.%), two major constituents of bone, mainly as a mixture of Ca10(PO4)6(OH)2 and Ca3(PO4)2 phases. The impact of combustion temperature (from 550 to 1000 degrees C) on the constitution of ashes was followed by TGA, XRD and specific surface measurements. We observed a strong decrease of surface area for the ashes with crystallisation of calcium phosphates phases without major changes of chemical composition.

  3. Thermal behavior of the major constituents of some agricultural biomass residues during pyrolysis and combustion

    Energy Technology Data Exchange (ETDEWEB)

    Yaman, S.; Haykiri-Acma, H. [Istanbul Technical Univ., Istanbul (Turkey). Dept. of Chemical Engineering, Chemical and Metallurgical Engineering Faculty

    2006-07-01

    The importance of woody agricultural waste as a renewable energy source was discussed with reference to its low cost, abundance, and carbon dioxide neutrality. Direct combustion of biomass waste fuels is not recommended due to its low density, high moisture content and low calorific energy. Rather, thermal conversion processes such as pyrolysis, gasification or carbonization are preferred for biomass. The performance and the energy recovery potentials of these processes depend on the process conditions as well as the physical and chemical properties of the biomass species. Therefore, the structure and components of biomass must be known. In this study, agricultural biomass samples of almond shell, walnut shell, hazelnut shell, rapeseed, olive residue, and tobacco waste were first analytically treated to remove extractive matter to obtain extractive-free samples. Specific analytic procedures were then applied to biomass samples in order to isolate their individual biomass constituents such as lignin and holocellulose. Untreated biomass samples and their isolated constituents were exposed to non-isothermal pyrolysis and combustion processes in a thermogravimetric analyzer. Pyrolysis experiments were conducted under dynamic nitrogen atmospheres of 40 mL-min, while dynamic dry air atmosphere with the same flow rate was applied in the combustion experiments. The study showed that the pyrolysis and combustion characteristics of the biomass samples differed depending on their properties. Aliphatic and oxygen rich holocellulose and cellulose were found to be the reactive components in biomass. Lignin was more stable during thermal processes. When extractive matter from the biomass samples was removed, pyrolysis at lower temperatures was terminated. 10 refs., 4 tabs., 3 figs.

  4. Combustion

    CERN Document Server

    Glassman, Irvin

    1987-01-01

    Combustion, Second Edition focuses on the underlying principles of combustion and covers topics ranging from chemical thermodynamics and flame temperatures to chemical kinetics, detonation, ignition, and oxidation characteristics of fuels. Diffusion flames, flame phenomena in premixed combustible gases, and combustion of nonvolatile fuels are also discussed. This book consists of nine chapters and begins by introducing the reader to heats of reaction and formation, free energy and the equilibrium constants, and flame temperature calculations. The next chapter explores the rates of reactio

  5. Efficiency and emission of crop residues combustion facilities in Serbia: Status and needed measures for improvement

    Directory of Open Access Journals (Sweden)

    Martinov Milan

    2006-01-01

    Full Text Available Use of crop residues as fuel has a long tradition in rural areas of Serbia. Numerous biomass-fueled facilities were built during the 80s. Among those were small facilities for household heating, with thermal power from 5 to 50 kW, medium-size facilities for farm and greenhouses, with thermal power 50 to 1000 kW, and large facilities for processing of agricultural products, with thermal powers higher than 1000 kW. The results showed that the level of biomass combustion facilities is in general very low. This is especially the case for heating facilities used for house-hold heating. The measures for improvement were proposed. .

  6. The impact of coal combustion residue effluent on water resources: a North Carolina example.

    Science.gov (United States)

    Ruhl, Laura; Vengosh, Avner; Dwyer, Gary S; Hsu-Kim, Heileen; Schwartz, Grace; Romanski, Autumn; Smith, S Daniel

    2012-11-06

    The combustion of coal to generate electricity produces about 130 million tons of coal combustion residues (CCRs) each year in the United States; yet their environmental implications are not well constrained. This study systematically documents the quality of effluents discharged from CCR settling ponds or cooling water at ten sites and the impact on associated waterways in North Carolina, compared to a reference lake. We measured the concentrations of major and trace elements in over 300 samples from CCR effluents, surface water from lakes and rivers at different downstream and upstream points, and pore water extracted from lake sediments. The data show that CCR effluents contain high levels of contaminants that in several cases exceed the U.S. EPA guidelines for drinking water and ecological effects. This investigation demonstrates the quality of receiving waters in North Carolina depends on (1) the ratio between effluent flux and freshwater resource volumes and (2) recycling of trace elements through adsorption on suspended particles and release to deep surface water or pore water in bottom sediments during periods of thermal water stratification and anoxic conditions. The impact of CCRs is long-term, which influences contaminant accumulation and the health of aquatic life in water associated with coal-fired power plants.

  7. Analysis of household ignitable liquids and their post-combustion weathered residues using compound-specific gas chromatography-combustion-isotope ratio mass spectrometry.

    Science.gov (United States)

    Schwartz, Zeland; An, Yan; Konstantynova, Kateryna I; Jackson, Glen P

    2013-12-10

    The continuing rise in home and vehicular arson cases involving the use of ignitable liquids continues to be an area of concern for criminal and civil investigators. In this study, the compound-specific δ(13)C values of various components of four flammable household chemicals were measured using a single quadrupole mass spectrometer and an isotope ratio mass spectrometer as simultaneous detectors for a gas chromatograph. Whereas compound-specific carbon isotope ratios were able to discriminate between different sources of neat (pre-combustion) ignitable liquids, analyses of the post-combustion residues were problematic. Weathering caused by combustion resulted in a significant increase in the (13)C content of specific peaks relative to the neat liquids (i.e. less negative delta values) such that the isotopic comparison of pre- and post-combustion residues resulted in fractionation ranging from 0 to +10‰. Because of the current lack of understanding of isotopic fractionation during combustion, and because of problems encountered with co-elution in the more complex samples, compound-specific IRMS does not appear to be suitable for fire debris analysis. The comparison of non-combusted or non-weathered ignitable liquids is much more reliable, especially for relatively simple mixtures, and is best suited for exclusionary purposes until such time as a comprehensive database of samples is developed. Without a measure of the population variance, one cannot presently predict the false positive identification rate for the comparison of two ignitable liquids; i.e. the probability that two random ignitable liquid samples have indistinguishable isotope ratios.

  8. CHARACTERIZATION OF MERCURY-ENRICHED COAL COMBUSTION RESIDUES FROM ELECTRIC UTILITIES USING ENHANCED SORBENTS FOR MERCURY CONTROL

    Science.gov (United States)

    Leaching of mercury and other constituents of potential concern during land disposal or beneficial use of coal combustion residues (CCRs) is the environmental impact pathway evaluated in this report. The specific objectives of the research was to: (1) evaluate mercury, arsenic an...

  9. COMPARISON OF PARTICLE SIZE DISTRIBUTIONS AND ELEMENTAL PARTITIONING FROM THE COMBUSTION OF PULVERIZED COAL AND RESIDUAL FUEL OIL

    Science.gov (United States)

    The paper gives results of experimental efforts in which three coals and a residual fuel oil were combusted in three different systems simulating process and utility boilers. Particloe size distributions (PSDs) were determined using atmospheric and low-pressure impaction, electr...

  10. Aceites esenciales: mitos y realidades

    OpenAIRE

    García García, Pablo

    2014-01-01

    Los aceites esenciales son mezclas complejas de compuestos volátiles extraídos de plantas olorosas. Estos compuestos son utilizados por las plantas para su desarrollo, reproducción o protección. Los aceites esenciales han sido utilizados desde la antigüedad con fines bactericidas, antiparasitarios, insecticidas, medicinales y cosméticos y en la actualidad se usan en la industria farmacéutica, cosmética, agrícola y alimentaria.

  11. Naturally Occurring Radioactive Materials in Coals and Coal Combustion Residuals in the United States.

    Science.gov (United States)

    Lauer, Nancy E; Hower, James C; Hsu-Kim, Heileen; Taggart, Ross K; Vengosh, Avner

    2015-09-15

    The distribution and enrichment of naturally occurring radioactive materials (NORM) in coal combustion residuals (CCRs) from different coal source basins have not been fully characterized in the United States. Here we provide a systematic analysis of the occurrence of NORM ((232)Th, (228)Ra, (238)U, (226)Ra, and (210)Pb) in coals and associated CCRs from the Illinois, Appalachian, and Powder River Basins. Illinois CCRs had the highest total Ra ((228)Ra + (226)Ra = 297 ± 46 Bq/kg) and the lowest (228)Ra/(226)Ra activity ratio (0.31 ± 0.09), followed by Appalachian CCRs (283 ± 34 Bq/kg; 0.67 ± 0.09), and Powder River CCRs (213 ± 21 Bq/kg; 0.79 ± 0.10). Total Ra and (228)Ra/(226)Ra variations in CCRs correspond to the U and Th concentrations and ash contents of their feed coals, and we show that these relationships can be used to predict total NORM concentrations in CCRs. We observed differential NORM volatility during combustion that results in (210)Pb enrichment and (210)Pb/(226)Ra ratios greater than 1 in most fly-ash samples. Overall, total NORM activities in CCRs are 7-10- and 3-5-fold higher than NORM activities in parent coals and average U.S. soil, respectively. This study lays the groundwork for future research related to the environmental and human health implications of CCR disposal and accidental release to the environment in the context of this elevated radioactivity.

  12. Detección de adulteraciones y/o contaminaciones del aceite de oliva virgen extra con aceites de semillas y aceite de orujo de oliva

    Directory of Open Access Journals (Sweden)

    Franco, I.

    2008-06-01

    Full Text Available The objective of this work was to determine the contents of fatty acids, squalen and triglycerides and the values of some spectrophotometric parameters in a representative number of samples of refined seed oil (sunflower and soybean, refined olive pomace oil and extra virgin olive oil and to attempt the detection of possible contaminations and/or adulterations of the virgin olive oil with seed oils or residue olive oil from the differentiating parameters of each oil type was carried out. The K270 value and the sum of the percentages of the trans-linoleic and trans-linolenic isomers allow for detection of the presence of 10% refined residue olive oil in extra virgin olive oil. The detection of 1% and 2% sunflower and soybean oils respectively, in extra virgin olive oil was possible through theΔECN42 values and the percentages of the sum of the isomeric trans-linoleic and trans-linolenic. The three adulterations made (1%, 2% and 10% refined sunflower oil, refined soybean oil and refined olive pomace oil, respectively, in extra virgin olive oil were correctly differentiated by applying discriminant analysis techniques using ΔECN42, ΔK and the sum of the translinoleic and trans-linolenic isomers as variables.El objetivo de este trabajo ha sido determinar en un número representativo de muestras de aceite de oliva virgen, orujo de oliva y de semillas (girasol y soja el contenido en ácidos grasos, escualeno y triglicéridos, y los valores de parámetros espectrofotométricos; asimismo, y en función de los parámetros diferenciadores de cada tipo de aceite, se intentó detectar posibles contaminaciones y/o adulteraciones del aceite de oliva virgen con aceites de semillas y orujo de oliva. El valor de K270 y la suma de los porcentajes de los isómeros trans-linoleico y trans-linolénico permitió detectar una presencia del 10% de aceite de orujo refinado en aceite de oliva virgen extra. Los valores de ΔECN42 y los porcentajes de la suma de

  13. Boron and strontium isotopic characterization of coal combustion residuals: validation of new environmental tracers.

    Science.gov (United States)

    Ruhl, Laura S; Dwyer, Gary S; Hsu-Kim, Heileen; Hower, James C; Vengosh, Avner

    2014-12-16

    In the U.S., coal fired power plants produce over 136 million tons of coal combustion residuals (CCRs) annually. CCRs are enriched in toxic elements, and their leachates can have significant impacts on water quality. Here we report the boron and strontium isotopic ratios of leaching experiments on CCRs from a variety of coal sources (Appalachian, Illinois, and Powder River Basins). CCR leachates had a mostly negative δ(11)B, ranging from -17.6 to +6.3‰, and (87)Sr/(86)Sr ranging from 0.70975 to 0.71251. Additionally, we utilized these isotopic ratios for tracing CCR contaminants in different environments: (1) the 2008 Tennessee Valley Authority (TVA) coal ash spill affected waters; (2) CCR effluents from power plants in Tennessee and North Carolina; (3) lakes and rivers affected by CCR effluents in North Carolina; and (4) porewater extracted from sediments in lakes affected by CCRs. The boron isotopes measured in these environments had a distinctive negative δ(11)B signature relative to background waters. In contrast (87)Sr/(86)Sr ratios in CCRs were not always exclusively different from background, limiting their use as a CCR tracer. This investigation demonstrates the validity of the combined geochemical and isotopic approach as a unique and practical identification method for delineating and evaluating the environmental impact of CCRs.

  14. Material and energy recovery from Automotive Shredded Residues (ASR) via sequential gasification and combustion.

    Science.gov (United States)

    Viganò, F; Consonni, S; Grosso, M; Rigamonti, L

    2010-01-01

    Shredding is the common end-of-life treatment in Europe for dismantled car wrecks. It produces the so-called Automotive Shredded Residue (ASR), usually disposed of in landfill. This paper summarizes the outcome of a study carried out by Politecnico di Milano and LEAP with the support of Actelios SpA on the prospects of a technology based on sequential gasification and combustion of this specific waste stream. Its application to the treatment of ASR allows the recovery of large fractions of metals as non-oxidized, easily marketable secondary raw materials, the vitrification of most of the ash content and the production of power via a steam cycle. Results show that despite the unfavourable characteristics of ASR, the proposed technology can reach appealing energy performances. Three of four environmental impact indicators and the cumulative energy demand index are favourable, the main positive contributes being electricity production and metal recovery (mainly aluminium and copper). The only unfavourable indicator is the global warming index because, since most of the carbon in ASR comes from fossil sources, the carbon dioxide emissions at the stack of the thermal treatment plant are mainly non-renewable and, at the same time, the avoided biogas production from the alternative disposal route of landfilling is minor.

  15. Selenium Ecotoxicology in Freshwater Lakes Receiving Coal Combustion Residual Effluents: A North Carolina Example.

    Science.gov (United States)

    Brandt, Jessica E; Bernhardt, Emily S; Dwyer, Gary S; Di Giulio, Richard T

    2017-02-21

    Anthropogenic activities resulting in releases of selenium-laden waste streams threaten freshwater ecosystems. Lake ecosystems demand special consideration because they are characterized by prolonged retention of selenium and continuous cycling of the element through the food chain, through which it becomes available to toxicologically susceptible egg-laying vertebrates. This study documents the current selenium burden of lakes in North Carolina (NC) with historic selenium inputs from nearby coal-fired power plants. We measured selenium concentrations in surface waters, sediment pore waters, and resident fish species from coal combustion residual (CCR)-impacted lakes and paired reference lakes. The data are related to levels of recent selenium inputs and analyzed in the context of recently updated federal criteria for the protection of aquatic life. We show that the Se content of fish from lakes with the highest selenium inputs regularly exceed these criteria and are comparable to those measured during historic fish extirpation events in the United States. Large legacy depositions of CCRs within reservoir sediments are likely to sustain Se toxicity for many years despite recent laws to limit CCR discharge into surface waters in NC. Importantly, the widespread use of high-selenium coals for electricity generation extends the potential risk for aquatic ecosystem impacts beyond U.S. borders.

  16. Properties of Chemically Combusted Calcium Carbide Residue and Its Influence on Cement Properties

    Directory of Open Access Journals (Sweden)

    Hongfang Sun

    2015-02-01

    Full Text Available Calcium carbide residue (CCR is a waste by-product from acetylene gas production. The main component of CCR is Ca(OH2, which can react with siliceous materials through pozzolanic reactions, resulting in a product similar to those obtained from the cement hydration process. Thus, it is possible to use CCR as a substitute for Portland cement in concrete. In this research, we synthesized CCR and silica fume through a chemical combustion technique to produce a new reactive cementitious powder (RCP. The properties of paste and mortar in fresh and hardened states (setting time, shrinkage, and compressive strength with 5% cement replacement by RCP were evaluated. The hydration of RCP and OPC (Ordinary Portland Cement pastes was also examined through SEM (scanning electron microscope. Test results showed that in comparison to control OPC mix, the hydration products for the RCP mix took longer to formulate. The initial and final setting times were prolonged, while the drying shrinkage was significantly reduced. The compressive strength at the age of 45 days for RCP mortar mix was found to be higher than that of OPC mortar and OPC mortar with silica fume mix by 10% and 8%, respectively. Therefore, the synthesized RCP was proved to be a sustainable active cementitious powder for the strength enhanced of building materials, which will result in the diversion of significant quantities of this by-product from landfills.

  17. Characteristics variation of coal combustion residues in an Indian ash pond.

    Science.gov (United States)

    Asokan, Pappu; Saxena, Mohini; Aparna, Asokan; Asolekar, Shyam R; Asoletar, Shyam R

    2004-08-01

    Coal-fired power plants all over the world are cited as one of the major sources that generate huge quantities of coal combustion residues (CCRs) as solid wastes. Most frequently CCRs are collected through electrostatic precipitators, mixed with bottom ash by hydraulic systems and deposited in ash ponds. The quality of the CCRs at different locations in one of the ash ponds in Central India was evaluated to understand the variation in characteristics with a view to effective utilization. Results revealed that the presence of fine particles (distance from the ash slurry inlet zone in the ash pond. Wide variations in the bulk density (800-980 kg m(-3)), porosity (45-57%) and water-holding capacity (57.5-75.7%) of CCRs were recorded. With increasing distance the pH of the CCRs decreased (from 9.0 to 8.2) and electrical conductivity increased (from 0.25 to 0.65 dS m(-3)). The presence of almost all the heavy metals in CCRs exhibited an increase with distance from the ash slurry discharge zone due to the increase in surface area (from 0.1038 to 2.3076 m2 g(-1)) of CCRs particles. The present paper describes the variation of characteristics of CCRs deposited in the ash pond and their potential applications.

  18. Analysis of naturally-occurring radionuclides in coal combustion fly ash, gypsum, and scrubber residue samples.

    Science.gov (United States)

    Roper, Angela R; Stabin, Michael G; Delapp, Rossane C; Kosson, David S

    2013-03-01

    Coal combustion residues from coal-fired power plants can be advantageous for use in building and construction materials. These by-products contain trace quantities of naturally occurring radionuclides from the uranium and thorium series, as well as other naturally occurring radionuclides such as K. Analysis was performed on samples of coal fly ash, flue gas desulfurization, gypsum and scrubber sludges, fixated scrubber sludges, and waste water filter cakes sampled from multiple coal-fired power plants in the United States. The radioactive content of U and Th decay series nuclides was determined using gamma photopeaks from progeny Pb at 352 keV and Tl at 583 keV, respectively; K specific activities were determined using the 1,461 keV photopeak. The samples were hermetically sealed to allow for secular equilibrium between the radium parents and the radon and subsequent progeny. Samples were analyzed in a common geometry using two high purity germanium photon detectors with low energy detection capabilities. The specific activities (Bq kg) were compared to results from literature studies including different building materials and fly ash specific activities. Fly ash from bituminous and subbituminous coals had U specific activities varying from 30-217 Bq kg (mean + 1 s.d. 119 ± 45 Bq kg) and 72-209 Bq kg (115 ± 40 Bq kg), respectively; Th specific activities from 10-120 Bq kg (73 ± 26 Bq kg) and 53-110 Bq kg (81 ± 18 Bq kg), respectively; and K specific activities from 177 to 928 Bq kg (569 ± 184 Bq kg) and 87-303 Bq kg (171 ± 69 Bq kg), respectively. Gypsum samples had U, Th, and K specific activities approximately one order of magnitude less than measured for fly ash samples.

  19. Short-term influence of coal mine reclamation using coal combustion residues on groundwater quality.

    Science.gov (United States)

    Cheng, Chin-Min; Amaya, Maria; Butalia, Tarunjit; Baker, Robert; Walker, Harold W; Massey-Norton, John; Wolfe, William

    2016-11-15

    Two full-scale coal mine reclamation projects using coal combustion residues (CCRs) were recently carried out at highwall pit complexes near the Conesville and Cardinal coal-fired power plants owned by American Electric Power. The environment impacts of the reclamation projects were examined by regularly monitoring the leaching characteristics of the backfilling CCRs and the water quality of the uppermost aquifers underlying the sites. With over five years of field monitoring, it shows that the water quality at both demonstration sites had changed since the reclamation began. By analyzing the change of the hydrogeochemical properties, it was concluded that the water quality impact observed at the Conesville Five Points site was unlikely due to the seepage of FGD material leachates. Reclamation activities, such as logging, grading, and dewatering changed the hydrogeological conditions and resulted in the observed water quality changes. The same hydrogeological effect on water quality was also found at the Cardinal Star Ridge site during the early stage of the reclamation (approximately the first 22months). Subsequent measurements showed the water quality to be strongly influenced by the water in the reclaimed highwall pit. Despite the changes to the water quality, the impacts are insignificant and temporary. None of the constitutes showed concentration levels higher than the regulatory leaching limits set by the Ohio Department of Natural Resources' Division of Mineral Resources Management for utilizing CCRs in mined land reclamation. Compared to the local aquifers, the concentrations of eleven selected constituents remained at comparable levels throughout the study period. There are four constituents (i.e., As, Be, Sb, and Tl) that exceeded their respective MCLs after the reclamation began. These detections were found shortly (i.e., within 2years) after the reclamation began and decreased to the levels either lower than the respective detection limits or similar to

  20. Elemental analysis of ash residue from combustion of CCA treated wood waste before and after electrodialytic extraction

    DEFF Research Database (Denmark)

    Pedersen, Anne Juul; Ottosen, Lisbeth M.

    2006-01-01

    Element distribution in a combined fly ash and bottom ash from combustion of copper chromate arsenate (CCA) treated wood waste was investigated by scanning electron microscopy (SEM/EDX) before and after electrodialytic extraction. The untreated ash contained various particles, including pieces...... treatment. Instead particles rich in Ca and S were now found, indicating precipitation of Ca-sulphates due to addition of sulphuric acid in connection with the electrodialytic treatment. Cu and Cr were still found associated with incompletely combusted wood particles and incorporated in matrix particles....... Chemical analyses of untreated and treated ash confirmed that most As, but only smaller amounts of Cu and Cr was removed due to the electrodialytic extraction. Overall metal contents in the original ash residue were: 1.4 g As, 2.76 g Cu and 2.48 g Cr, after electrodialytic extraction these amounts were...

  1. Comparison of the carbon-sequestering abilities of pineapple leaf residue chars produced by controlled combustion and by field burning.

    Science.gov (United States)

    Leng, L Y; Husni, M H A; Samsuri, A W

    2011-11-01

    This study was undertaken to compare the chemical properties and yields of pineapple leaf residue (PLR) char produced by field burning (CF) with that produced by a partial combustion of air-dried PLR at 340 °C for 3 h in a furnace (CL). Higher total C, lignin content, and yield from CL as well as the presence of aromatic compounds in the Fourier Transform Infrared spectra of the char produced from CL suggest that the CL process was better in sequestering C than was the CF process. Although the C/N ratio of char produced from CL was low indicating a high N content of the char, the C in the char produced from CL was dominated by lignin suggesting that the decomposition of char produced from CL would be slow. To sequester C by char application, the PLR should be combusted in a controlled process rather than by burning in the field.

  2. Beneficial use of meat and bone meal combustion residue: "an efficient low cost material to remove lead from aqueous effluent".

    Science.gov (United States)

    Deydier, Eric; Guilet, Richard; Sharrock, Patrick

    2003-07-04

    Meat and bone meal (MBM) combustion residues, a natural apatite-rich substance, was evaluated as a low cost substitute for hydroxyapatite in lead sequestration from water effluents. The thermal behaviour of crude meat and bone meal was followed by TGA and 24% inorganic residue was collected. The resulting ashes were characterised by powder X-ray diffraction (XRD), particle size distribution, specific surface area (BET), and elemental analysis confirming apatite contents, with high level of phosphate (56.3%) and calcium (36.8%). Mechanism and kinetics of lead removal by this bioinorganic material were investigated and compared to mechanisms and kinetics involved with synthetic apatite. Batch metal removal experiments were carried out with 500 and 1500ppm (mg/kg) Pb(2+) solutions. Lead concentration, calcium and pH were monitored. We observed that the mechanism is similar to that occurring for pure apatite, and involved both surface complexation and calcium hydroyapatite (CaHA), Ca(10)(PO(4))(6)(OH)(2), dissolution followed by less soluble Pb(10)(PO(4))(6)(OH)(2) precipitation, as confirmed by XRD analysis of ashes after incubation with lead solution. Our results show that this natural apatite-rich material removes in a few minutes a large quantity of lead (275mg/g capacity) which remains however lower than the theoretical maximum capacity (if calcium were totally substituted by lead). Meat and bone meal combustion residues represent a valuable alternative apatite source for environmental application.

  3. Low NO/x/ combustion systems for burning heavy residual fuels and high-fuel-bound nitrogen fuels

    Science.gov (United States)

    White, D. J.; Batakis, A.; Lecren, R. T.; Yacobucci, H. G.

    1981-01-01

    Design concepts are presented for lean-lean and staged rich-lean combustors. The combustors are designed for the dry reduction of thermal NO(x), control of NO(x) from fuels containing high levels of organic nitrogen, and control of smoke from low hydrogen content fuels. The combustor concepts are tested with a wide variety of fuels including a middle distillate, a petroleum based heavy residual, a coal derived synthetic, and ratios of blends of these fuels. The configurations of the lean-lean and rich-lean combustion systems are provided along with a description of the test rig and test procedure.

  4. Vitamina E y aceites vegetales

    Directory of Open Access Journals (Sweden)

    Morales, M. T.

    2007-03-01

    Full Text Available An interest in vitamin E has increased in recent years due to its potent antioxidant properties and its role in preventing age-related diseases, cardiovascular diseases or Alzheimer. This work describes the biogenesis, bioavailability, nutritional requirements, activity and properties of vitamin E. Vegetable oils constitute one of the main sources of vitamin E dietary intake and an extensive bibliographic revision of this vitamin in vegetable oils is carried out from four points of view: antioxidant properties, health benefits, effects of external agents and effects of processing on vitamin E content and analytical techniques used for its analysis.El interés por la vitamina E ha aumentado en los últimos años debido a su potente poder antioxidante y a su papel frente a enfermedades relacionadas con la edad, trastornos cardiovasculares o Alzheimer. En este trabajo se detallan la biogénesis, biodisponibilidad, requerimientos nutricionales, actividad y propiedades de la vitamina E. Los aceites vegetales constituyen una de las fuentes principales de aporte de vitamina E a través de la dieta, por lo que se lleva a cabo una amplia revisión bibliográfica desde cuatro puntos de vista: vitamina E y propiedades antioxidantes, beneficios para la salud debidos a la ingestión de aceites vegetales, efecto de agentes externos y procesado sobre el contenido de vitamina E y técnicas analíticas utilizadas para su análisis.

  5. Physical and chemical characterisation of crude meat and bone meal combustion residue: 'waste or raw material?'

    Energy Technology Data Exchange (ETDEWEB)

    Deydier, Eric [Laboratoire de Chimie Inorganique et Sante, Universite Paul Sabatier, IUT A, Avenue Georges Pompidou, 81100 Castres (France)]. E-mail: eric.deydier@iut-tlse3.fr; Guilet, Richard [Laboratoire de Chimie Inorganique et Sante, Universite Paul Sabatier, IUT A, Avenue Georges Pompidou, 81100 Castres (France); Sarda, Stephanie [Laboratoire de Chimie Inorganique et Sante, Universite Paul Sabatier, IUT A, Avenue Georges Pompidou, 81100 Castres (France); Sharrock, Patrick [LCBM, Universite Paul Sabatier, Avenue Georges Pompidou, 81100 Castres (France)

    2005-05-20

    As a result of the recent bovine spongiform encephalopathy (BSE) crisis in the European beef industry, the use of animal by-product is now severely controlled. Meat and bone meal (MBM) production can no longer be used to feed cattle and must be safely disposed of or transformed. Main disposal option is incineration, producing huge amounts of ashes the valorisation of which becomes a major concern. The aim of this work is to characterise MBM combustion residue in order to evaluate their physical and chemical properties to propose new valorisation avenues. The thermal behaviour of crude meat and bone meal was followed by thermogravimetric analysis (TGA) and (24 wt.%) inorganic residue was collected. The resulting ashes were characterised by powder X-ray diffraction (XRD), particle size distribution, specific surface area (BET), scanning electron microscopy (SEM) couple with energy disperse X-ray analysis (EDX). Elemental analysis revealed the presence of chloride, sodium, potassium, magnesium with high level of phosphate (56 wt.%) and calcium (31 wt.%), two major constituents of bone, mainly as a mixture of Ca{sub 10}(PO{sub 4}){sub 6}(OH){sub 2} and Ca{sub 3}(PO{sub 4}){sub 2} phases. The impact of combustion temperature (from 550 to 1000 deg. C) on the constitution of ashes was followed by TGA, XRD and specific surface measurements. We observed a strong decrease of surface area for the ashes with crystallisation of calcium phosphates phases without major changes of chemical composition.

  6. Experimental Investigation on NOx Reduction by Primary Measures in Biomass Combustion: Straw, Peat, Sewage Sludge, Forest Residues and Wood Pellets

    Directory of Open Access Journals (Sweden)

    Øyvind Skreiberg

    2012-02-01

    Full Text Available An experimental investigation was carried out to study the NOx formation and reduction by primary measures for five types of biomass (straw, peat, sewage sludge, forest residues/Grot, and wood pellets and their mixtures. To minimize the NOx level in biomass-fired boilers, combustion experiments were performed in a laboratory scale multifuel fixed grate reactor using staged air combustion. Flue gas was extracted to measure final levels of CO, CO2, CxHy, O2, NO, NO2, N2O, and other species. The fuel gas compositions between the first and second stage were also monitored. The experiments showed good combustion quality with very low concentrations of unburnt species in the flue gas. Under optimum conditions, a NOx reduction of 50–80% was achieved, where the highest reduction represents the case with the highest fuel-N content. The NOx emission levels were very sensitive to the primary excess air ratio and an optimum value for primary excess air ratio was seen at about 0.9. Conversion of fuel nitrogen to NOx showed great dependency on the initial fuel-N content, where the blend with the highest nitrogen content had lowest conversion rate. Between 1–25% of the fuel-N content is converted to NOx depending on the fuel blend and excess air ratio. Sewage sludge is suggested as a favorable fuel to be blended with straw. It resulted in a higher NOx reduction and low fuel-N conversion to NOx. Tops and branches did not show desirable NOx reduction and made the combustion also more unstable. N2O emissions were very low, typically below 5 ppm at 11% O2 in the dry flue gas, except for mixtures with high nitrogen content, where values up to 20 ppm were observed. The presented results are part of a larger study on problematic fuels, also considering ash content and corrosive compounds which have been discussed elsewhere.

  7. PROPUESTA DE MINIMIZACIÓN DEL IMPACTO AMBIENTAL PRODUCIDO POR VERTIDOS DE ACEITES VEGETALES USADOS

    Directory of Open Access Journals (Sweden)

    Héctor Chamorro

    2006-04-01

    Full Text Available Este artículo Desarrolla una propuesta para minimizar el impacto ambiental producido por los vertidos de los aceites vegetales usados (AVU a las redes de aguas de desecho municipales, vertederos, rellenos sanitarios, cuerpos de aguas naturales. . Se determinó y cuantificó el universo de potenciales suplidores de aceites vegetales usados en la ciudad de Puerto Ordaz, Con los AVU se producirá un combustible ecológico, a través de la transesterificación de esteres. Se diseño y construyo una planta piloto para estudiar las reacciones químicas involucradas en el proceso y la producción del combustible ecológico (BIODIESEL, que podrá ser utilizado en cualquier motor Diesel.

  8. Effects of retorting factors on combustion properties of shale char. 3. Distribution of residual organic matters.

    Science.gov (United States)

    Han, Xiangxin; Jiang, Xiumin; Cui, Zhigang; Liu, Jianguo; Yan, Junwei

    2010-03-15

    Shale char, formed in retort furnaces of oil shale, is classified as a dangerous waste containing several toxic compounds. In order to retort oil shale to produce shale oil as well as treat shale char efficiently and in an environmentally friendly way, a novel kind of comprehensive utilization system was developed to use oil shale for shale oil production, electricity generation (shale char fired) and the extensive application of oil shale ash. For exploring the combustion properties of shale char further, in this paper organic matters within shale chars obtained under different retorting conditions were extracted and identified using a gas chromatography-mass spectrometry (GC-MS) method. Subsequently, the effects of retorting factors, including retorting temperature, residence time, particle size and heating rate, were analyzed in detail. As a result, a retorting condition with a retorting temperature of 460-490 degrees C, residence time of circulating fluidized bed technology with fractional combustion.

  9. Thermal Degradation Characteristics and Kinetics of Oxy Combustion of Corn Residues

    Directory of Open Access Journals (Sweden)

    Poramate Sittisun

    2015-01-01

    Full Text Available Thermogravimetric analysis was used to investigate oxy combustion of corncob and stover. The biomass samples were heated from ambient temperature to 900°C at different heating rates of 10, 30, and 50 K/min. Both biomass samples showed similar weight loss patterns with three zones, corresponding to dehydration, devolatilization, and char combustion, but displayed different degradation temperatures. Increasing heating rate was found to shift the degradation patterns to higher temperatures. Decomposition rates of cob and stover may have been influenced by their lignocellulosic composition. The kinetic parameters of the thermal degradation process were also determined and compared using the Flynn-Wall-Ozawa and Kissinger-Akahira-Sunose methods. Both methods were found to give similar values and patterns of activation energy against conversion fraction. The average values were found to be in similar magnitude to those reported in the literature, around 170 and 148 kJ/mol for cob and stover, respectively.

  10. Recovery of Trace and Heavy Metals from Coal Combustion Residues for Reuse and Safe Disposal: A Review

    Science.gov (United States)

    Kumar, Ashvani; Samadder, Sukha Ranjan; Elumalai, Suresh Pandian

    2016-09-01

    The safe disposal of coal combustion residues (CCRs) will remain a major public issue as long as coal is used as a fuel for energy production. Both dry and wet disposal methods of CCRs create serious environmental problems. The dry disposal method creates air pollution initially, and the wet disposal method creates water pollution as a result of the presence of trace and heavy metals. These leached heavy metals from fly ash may become more hazardous when they form toxic compounds such as arsenic sulfite (As2S3) and lead nitrate (N2O6Pb). The available studies on trace and heavy metals present in CCRs cannot ensure environmentally safe utilization. In this work, a novel approach has been offered for the retrieval of trace and heavy metals from CCRs. If the proposed method becomes successful, then the recovered trace and heavy metals may become a resource and environmentally safe use of CCRs may be possible.

  11. Desarrollo y validación de una metodología para la determinación de residuos de orto-fenilfenol en aceite esencial de frutas cítricas en Tucumán, R. Argentina Development and validation of a methodology for determining orto-phenylphenol residues in citrus essential oil in Tucumán, Argentina

    Directory of Open Access Journals (Sweden)

    Norma Kamiya

    Full Text Available Los aceites esenciales de frutas cítricas constituyen mezclas complejas de compuestos orgánicos que interfieren en la cuantificación de residuos de plaguicidas. Siendo escasa la bibliografía encontrada para la determinación de orto-fenilfenol (OPP en estas matrices, este trabajo apunta a adaptar, desarrollar, validar y acreditar bajo Norma IRAM 301 (ISO/IEC 17025:2005, un método sencillo y de menor costo. Para dicha cuantificación, se tomaron como punto de partida metodologías aplicadas al análisis de frutas cítricas y se aprovechó el carácter ácido del OPP para separarlo mediante una extracción ácido-base. Posteriormente, fue detectado y cuantificado por cromatografía gaseosa (CG con detector de ionización de llama (FID. Se obtuvieron recuperaciones promedio de 89% a 104%, en el rango de 0,1 a 100 mg/kg, para aceite esencial de limón (AEL; de 93% a 103 % y de 90% a 114% entre 0,2 mg/kg y 10 mg/kg de OPP para aceite esencial de pomelo (AEP blanco y rosado, respectivamente. Los límites de detección fueron 0,05 mg/kg para AEL y 0,1 mg/kg para AEP blanco y rosado. Los límites de cuantificación fueron 0,1 mg/kg para AEL y 0,2 mg/kg para AEP. Además, se observaron una linealidad aceptable en los rangos evaluados e incertidumbres relativas de 24% para AEL, 14% para AEP blanco y 23% para AEP rosado.The essential oils of citric fruits constitute complex mixtures of organic compounds which interfere with pesticide residues quantitation. As there exists scarce bibliography on ortho-phenylphenol (OPP determination in this commodity, the present work aims to adapt, develop and validate a simple and cheaper method for determining phenylphenol residues in citrus essential oil, while certifying it under IRAM 301 standard (ISO/IEC 17025:2005. Citrus fruit analysis methods were used, taking advantage of OPP acidity for its extraction from the commodity by simple acid-base extraction. Later, gas chromatography with flame ionization detector

  12. Effects of water treatment residuals and coal combustion byproduct amendments on properties of a sandy soil and impact on crop production – A pot experiment

    Science.gov (United States)

    Byproducts of coal combustion (such as fly ash: FA), livestock industry (such as chicken manure: CM, or animal manure, etc), or water treatment residuals (such as sewage sludge: SS, or incinerated sewage sludge: ISS) can be used as amendments to agricultural soils, provided that these byproducts (ap...

  13. Evaluating the thermal stability of mercury and other metals in coal combustion residues used in the production of cement clinker, asphalt, and wallboard

    Science.gov (United States)

    Research is underway by the U.S. Environmental Protection Agency (EPA) to document any changes that may occur to coal combustion residues (CCRs) as a result of implementation of mercury and multiipollutant control technology at coal-fired power plants. This work was cited as a pr...

  14. [Emission inventory of greenhouse gases from agricultural residues combustion: a case study of Jiangsu Province].

    Science.gov (United States)

    Liu, Li-hua; Jiang, Jing-yan; Zong, Liang-gang

    2011-05-01

    Burning of agricultural crop residues was a major source greenhouse gases. In this study, the proportion of crop straws (rice, wheat, maize, oil rape, cotton and soja) in Jiangsu used as household fuel and direct open burning in different periods (1990-1995, 1996-2000, 2001-2005 and 2006-2008) was estimated through questionnaire. The emission factors of CO2, CO, CH4 and NO20 from the above six types of crop straws were calculated by the simulated burning experiment. Thus the emission inventory of greenhouse gases from crop straws burning was established according to above the burning percentages and emission factors, ratios of dry residues to production and crop productions of different periods in Jiangsu province. Results indicated that emission factors of CO2, CO, CH4 and N2O depended on crop straw type. The emission factors of CO2 and CH4 were higher for oil rape straw than the other straws, while the maize and the rice straw had the higher N2O and CO emission factor. Emission inventory of greenhouse gases from agricultural residues burning in Jiangsu province showed, the annual average global warming potential (GWP) of six tested crop straws were estimated to be 9.18 (rice straw), 4.35 (wheat straw), 2.55 (maize straw), 1.63 (oil rape straw), 0.55 (cotton straw) and 0. 39 (soja straw) Tg CO2 equivalent, respectively. Among the four study periods, the annual average GWP had no obvious difference between the 1990-1995 and 2006-2008 periods, while the maximal annual average GWP (23.83 Tg CO2 equivalent) happened in the 1996-2000 period, and the minimum (20.30 Tg CO2 equivalent) in 1996-2000 period.

  15. Computational fluid dynamics (CFD) analysis of the combustion process of a leather residuals gasification fuel gas: influence of fuel moisture content

    Energy Technology Data Exchange (ETDEWEB)

    Antonietti, Anderson Jose; Beskow, Arthur Bortolin; Silva, Cristiano Vitorino da [Universidade Regional Integrada do Alto Uruguai e das Missoes (URI), Erechim, RS (Brazil)], E-mails: arthur@uricer.edu.br, mlsperb@unisinos.br; Indrusiak, Maria Luiza Sperb [Universidade do Vale do Rio dos Sinos (UNISINOS), Sao Leopoldo, RS (Brazil)], E-mail: cristiano@uricer.edu.br

    2010-07-01

    This work presents a numerical study of the combustion process of leather residuals gasification gas, aiming the improvement of the process efficiency, considering different concentrations of water on the gas. The heating produced in this combustion process can be used to generation of thermal and/or electrical energy, for use at the leather industrial plant. However, the direct burning of this leather-residual-gas into the chambers is not straightforward. The alternative in development consists in processing this leather residuals by gasification or pyrolysis, separating the volatiles and products of incomplete combustion, for after use as fuel in a boiler. At these processes, different quantities of water can be used, resulting at different levels of moisture content in this fuel gas. This humidity can affect significantly the burning of this fuel, producing unburnt gases, as the carbon monoxide, or toxic gases as NOx, which must have their production minimized on the process, with the purpose of reducing the emission of pollutants to the atmosphere. Other environment-harmful-gases, remaining of the chemical treatment employed at leather manufacture, as cyanide, and hydrocarbons as toluene, must burn too, and the moisture content has influence on it. At this way, to increase understanding of the influence of moisture in the combustion process, it was made a numerical investigation study of reacting flow in the furnace, evaluating the temperature field, the chemical species concentration fields, flow mechanics and heat transfer at the process. The commercial CFD code CFX Ansys Inc. was used. Considering different moisture contents in the fuel used on the combustion process, with this study was possible to achieve the most efficient burning operation parameters, with improvement of combustion efficiency, and reduction of environmental harmful gases emissions. It was verified that the different moisture contents in the fuel gas demand different operation conditions

  16. Effects of alternate fuels. Report No. 6. Analysis of low-alumina castable refractory degraded by residual oil combustion products

    Energy Technology Data Exchange (ETDEWEB)

    Wei, G. C.; Tennery, V. J.

    1978-07-01

    This is the sixth of a series of reports on analyses of several types of refractories used in industrial furnaces with fuels considered alternate to natural gas. Analyses were performed on a low-alumina castable used for only two months in the roof of a residual-oil-fired boiler. The maximum hot-face temperature during operation was about 1530/sup 0/K. The original microstructure of the castable, which consisted of mullite aggregate bonded with iron-containing gehlenite (2 CaO . Al/sub 2/O/sub 3/ . SiO/sub 2/), quartz and cristobalite, was totally altered during service in regions close to the hot face. At room temperature the altered microstructure consisted of corundum and gehlenite in a new oxide glass phase containing the elements Na, K, Ca, Fe, Ti, Al, Ni, and Si. The reactions of the fuel oil impurities Na, Fe, and Ni with mullite, quartz, and cristobalite in the original castable refractory caused the rapid degradation at the hot face during service in the boiler. Increasing the Al/sub 2/O/sub 3/ content of the castable by replacing mullite aggregate with alumina aggregate and using gehlenite with less iron impurity as the bonding material should improve the performance of this castable refractory or retard reactions of the castable with fuel oil combustion products including Na, Fe, and Ni.

  17. Empleo de aceites esenciales como antioxidantes naturales

    Directory of Open Access Journals (Sweden)

    Zydgalo, J. A.

    1995-10-01

    Full Text Available The aims of this study were to determine and compare the antioxidant effect of essential oils from Thymus vulgaris, Laurus nobilis, Foeniculum vulgare, Eucalyptus globules, Tagetes minuta, Satureja parvifolia and Lippia polystachya in soybean oil. The concentrations of volatile oils in soybean oil were 0.1% and 0.02%. The antioxidant activity was measured by peroxide values. Thymus vulgaris and L. nobilis essential oils exhibited a significant antioxidant activity, followed by F. vulgare and E. globules in a decreasing order. Tagetes minuta, S. parvifolia and L. polystachya had not effect, and their contribution to the stability of soybean oil was negligible.

    Los objetivos de este estudio fueron determinar y comparar el efecto antioxidante de los aceites esenciales de Thymus vulgaris, Laurus nobilis, Foeniculum vulgare, Eucalyptus globulus, Tagetes minuta, Satureja parvifolia y Lippia polystachya en el aceite de soja. Las concentraciones de las esencias en el aceite de soja fueron 0.1% y 0.02%. La actividad antioxidante fue medida por los valores de peróxido. Los aceites esenciales de T. vulgaris y L nobilis exhibieron una significativa acción antioxidante seguidos, en orden decreciente, por F. vulgare y E. globulus. Las esencias de T. minuta, S. parvifolia y L polystachya no mostraron efecto antioxidante y su contribución a la estabilidad oxidativa del aceite de soja fue despreciable.

  18. Persistent free radicals, heavy metals and PAHs generated in particulate soot emissions and residue ash from controlled combustion of common types of plastic.

    Science.gov (United States)

    Valavanidis, Athanasios; Iliopoulos, Nikiforos; Gotsis, George; Fiotakis, Konstantinos

    2008-08-15

    The production and use of polymeric materials worldwide has reached levels of 150 million tonnes per year, and the majority of plastic materials are discarded in waste landfills where are burned generating toxic emissions. In the present study we conducted laboratory experiments for batch combustion/burning of commercial polymeric materials, simulating conditions of open fire combustion, with the purpose to analyze their emissions for chemical characteristics of toxicological importance. We used common types of plastic materials: poly(vinyl chloride) (PVC), low and high density poly(ethylene) (LDPE, HDPE), poly(styrene) (PS), poly(propylene) (PP) and poly(ethylene terephthalate) (PET). Samples of particulate smoke (soot) collected on filters and residue solid ash produced by controlled burning conditions at 600-750 degrees C are used for analysis. Emissions of particulate matter, persistent free radicals embedded in the carbonaceous polymeric matrix, heavy metals, other elements and PAHs were determined in both types of samples. Results showed that all plastics burned easily generating charred residue solid ash and black airborne particulate smoke. Persistent carbon- and oxygen-centered radicals, known for their toxic effects in inhalable airborne particles, were detected in both particulate smoke emissions and residue solid ash. Concentrations of heavy metals and other elements (determined by Inductively Coupled Plasma Emission Spectrometry, ICP, method) were measured in the airborne soot and residue ash. Toxic heavy metals, such as Pb, Zn, Cr, Ni, and Cd were relatively at were found at low concentrations. High concentrations were found for some lithophilic elements, such as Na, Ca, Mg, Si and Al in particulate soot and residue solid ash. Measurements of PAHs showed that low molecular weight PAHs were at higher concentrations in the airborne particulate soot than in the residue solid ash for all types of plastic. Higher-ringed PAHs were detected at higher

  19. An exploratory screening of organic substances in combustion residues; En orienterande screening av organiska aemnen i askor

    Energy Technology Data Exchange (ETDEWEB)

    Larsson, Lennart; Lind, Bo (Swedish Geotechnical Inst., Linkoeping (Sweden)); Bjurstroem, Henrik (AaF-Process, Stockholm (Sweden))

    2008-09-15

    Ash consists of the inorganic incombustible part of fuels, but it also always contains a small amount of organic matter, occurring as trace substances with concentrations in the order of mg/kg and lower. A few types of compounds are analysed comparatively frequently, e.g. PCDD/F (the so-called dioxins), but knowledge about the other organic substances is far from exhaustive. In this investigation, three ash samples have been subjected to a semi-quantitative GC/MS screening of semi-volatile substances. In this method of analysis the substances are extracted, separated in a gas chromatograph and identified as well as quantified using a mass spectrometer. Even if this type of analysis can be performed by researchers at universities, we chose to let commercial analytical laboratories do it in order to assess results from a nearly routine work. Residues from woody biofuels (recovered wood, virgin wood and bark) were chosen in order to complement the information that has previously been obtained on ash from municipal solid waste incineration. The GC/MS screening was carried out on both non-derivatised samples (non-polar compounds) and derivatised samples (polar compounds). The investigation aimed also at assessing the potential and the limitations of the screening method. In addition, the potentially hazardous properties of each identified substance were examined. Screening without and with derivatization is a cost-effective method to chart the content of semi-volatile organic substances. The results are relevant, but the method commercially available in Sweden is at present not mature enough for the use considered. It must be further developed before it can be included in e.g. regulatory texts. Limitations may be found in several steps of the method, principally: - Extraction and derivatisation, as the internal standard added is recovered only to a small extent for some ash samples, indicating that not everything has been found - Detection, i.e. both the sensitivity of

  20. Elaboración integral de las aceitunas con autogeneración de electricidad, comparada con el sistema actual de obtención del aceite de oliva virgen

    Directory of Open Access Journals (Sweden)

    Cruz Peragón, F.

    2004-09-01

    Full Text Available A future solution for treatment of the olive and obtaining olive virgin oil is presented. The energy demands for which are supplied by a generation system, that also feeds other phases of manufacture of by-products, such as "orujos" drying or extraction of the residual oil contained in them. For this purpose gasifier equipment is needed, whose major fuel is plain olive stone, although "orujos" with 20% humidity could also be used. This system produces a gas which is introduced in a combustion engine connected to a generator, harnessing the electricity created to supply the plant itself. The thermal energy surplus serves to generate and sell electrical energy to distribution grid.Se pretende plantear una solución de futuro para el proceso de elaboración de las aceitunas y obtención del aceite de oliva virgen, donde se generaría la energía eléctrica consumida en la propia planta, así como en las demás fases de elaboración completa de los subproductos, como el secado de los orujos y la extracción del aceite residual contenido en los mismos.Para esto se dimensiona un equipo gasificador del hueso, separado en el proceso de obtención indicado, con el que se abastece de energía térmica a un motor de gas que acciona un generador eléctrico, que abastece todas las necesidades de la planta integral, más el excedente de energía térmica del hueso y del orujillo resultante, generando una energía con posibilidad de venta a la red de distribución eléctrica de la zona.

  1. Beneficios para la combustión y el medio ambiente, con el uso de aceite vegetal

    Directory of Open Access Journals (Sweden)

    Melvis Betancourt Pérez

    2010-01-01

    Full Text Available El Centro Nacional de Electromagnetismo Aplicado (CNEA consiente de la necesidad de buscar nuevas alternativas de combustibles de origen vegetal (Biocombustible para reemplazar el combustible fósil, cuenta con un proyecto territorial de investigación básica, en el programa Desarrollo Energético Sostenible, con el titulo ¿Evaluación Energética del Biocombustible con y sin tratamiento magnético a partir de Aceite de Semilla de Jatrópha Curcas en Calderas de Baja Capacidad¿, como parte del mencionado proyecto, en este trabajo, se presentan los resultados obtenidos de la caracterización del aceite de la Jatrópha Curcas L, cosechada en la provincia de Guantánamo, realizándose un análisis de diferentes propiedades físicas del aceite de esta semilla para su posible utilización como combustible , ya sea de forma directa o mediante mezcla con fuel oil, además, se realizó una comparación de los parámetros medidos (viscosidad cinemática, carbón Conradson, punto de inflamación y otros parámetros, comparándose con los del fuel oil, los análisis fueron realizados en los laboratorios de la refinería, Hermanos Díaz Santiago de Cuba y en los laboratorios de Cubalub de Santiago de Cuba. Se debe destacar que la calidad de este aceite vegetal está dada principalmente por el contenido menor de agua, cenizas, azufre, vanadio y residuos carbonosos y por los valores mas bajos de la viscosidad cinemática, siendo estos adecuados para este tipo de compuesto, llegándose a la conclusión de que a pesar de su alto punto de inflamación este aceite puede ser utilizado como combustible y satisfacer las necesidades de energía, en calderas de baja capacidad.

  2. Combustion demonstration plant in circulant fluidized bed of residual coal; Planta de Demostracion de Combustion en Lecho Fluido Circulante de Carbones Residuales

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1998-12-31

    This report incorporates a summary of the operation results during the period of demonstration after started up. The report pretend to give an overview of the operation conditions along of the first year: Running hours, availability, electricity production, shooting downs, incidences, efficiency, fuel characteristics influence, pollutants emissions and standards comparations, etc. The main operation conclusions are: High availability, great number of running hours at full equivalent load; some months even over 100% regarding time scheduled. High reduction of gaseous emissions, really very low respecting the required by the applicable standards. It has been developed the engineering of a prototype project, by 30MW, using mixtures of solid fuels, residues and coals. (Author)

  3. Extracción de Grasas y Aceites en los Efluentes de una Industria Automotriz

    Directory of Open Access Journals (Sweden)

    Amelia Vidales Olivo

    2010-01-01

    Full Text Available En el presente trabajo se exponen los resultados obtenidos de una investigación realizada en los periodos comprendidos de Agosto-Diciembre 2006 a Enero-Junio 2007, la cual consistió en un estudio experimental en el que se determinó la cantidad de grasas y aceites que fueron separados del agua residual de la industria automotriz Moto Diesel Mexicana (MDM. El objetivo fue demostrar cuál de los tres métodos aplicados (A, B y C resultaba el más eficiente.

  4. Enterotoxinas y enzimas estafilococcicas en presencia de aceites esenciales

    OpenAIRE

    N????ez, L.; Moro, A; d'Aquino, M.

    2007-01-01

    Nuestro objetivo fue investigar el efecto de concentraciones subinhibitorias de clavo, canela, y tomillo en el crecimiento de S aureus y en la producci??n de coagulasa, termonucleasa y enterotoxina. Con ese fi n se agregaron diferentes concentraciones de los aceites esenciales a Caldo Cerebro Coraz??n. La producci??n de enterotoxina en presencia y en ausencia de los aceites esenciales se determin?? por la t??cnica de enzimoinmunoensayo (ELISA). Nuestros resultados indican que baja...

  5. El aceite de aguacate y sus propiedades nutricionales

    Directory of Open Access Journals (Sweden)

    R. Pérez Rosales

    2005-01-01

    Full Text Available El aceite de aguacate, por su composición de ácidos grasos, cumple con las recomendaciones nutricionales que se enfocan a reducir la cantidad de grasa saturada en la dieta. Se caracteriza por contener una baja proporción de ácidos grasos saturados (entre un 10 y 19 por ciento, depende de la variedad y el estado de madurez, una elevada cantidad de ácido oleico (puede llegar hasta un 80 por ciento, un nivel aceptable de ácidos grasos poliinsaturados (11-15 por ciento y nada de colesterol. Se ha demostrado que las dietas enriquecidas con aceite de aguacate son tan efectivas como aquellas que contienen aceite de maíz, aceite de soya o de girasol, para reducir colesterol total, colesterol LDL (lipoproteína de baja densidad y triglicéridos del plasma, tanto en individuos hipercolesterolémicos como con diabetes mellitus tipo 2, lo cual se refleja en una disminución de los riesgos cardiovasculares. El consumo de aceite de aguacate también eleva el porcentaje de colesterol HDL (lipoproteína de alta densidad del plasma, en modelos animales. Además, el aceite de aguacate posee un grado de aterogenicidad comparable al aceite de maíz o de oliva. La efectividad del aceite de aguacate en reducir colesterol total y colesterol LDL del plasma y su bajo nivel de aterogenicidad, indican que éste puede tener un papel benéfico dentro de una dieta nutritiva

  6. Scale-up study on combustibility and emission formation with two biomass fuels (B quality wood and pepper plant residue) under BFB conditions

    Energy Technology Data Exchange (ETDEWEB)

    Khan, Atif Ahmed; de Jong, Wiebren; Jansens, Peter Johannes [Department of Process and Energy, Section Energy Technology, Faculty 3ME, Delft University of Technology, Leeghwaterstraat 44, NL-2628 CA, Delft (Netherlands); Aho, Martti; Vainikka, Pasi [VTT Processes, P.O. Box 1603, 40101 Jyvaeskylae (Finland); Spliethoff, Hartmut [TU Munich, Lehrstuhl fuer Thermische Kraftanlagen, Boltzmannstrasse 15, D-85748 Garching (Germany)

    2008-12-15

    Combustion of two biomass fuels: demolition wood (DW) and pepper plant residue (PPR), was investigated from an emission viewpoint in a 20 kW{sub th} fluidized bubbling bed reactor and a 1 MW{sub th} fluidized bubbling bed test boiler. Fluidization velocity and boiler output were varied in the larger facility whereas they were kept constant in the smaller reactor. Traditional flue gases were analyzed. In addition, impactor measurements were carried out to determine the mass flow of the finest fly ash and toxic elements. These measurements were compared with EU emission directives for biomass co-incineration. It was possible to combust DW without operational problems. However, the DW was contaminated with lead, which tended to get strongly enriched in the fine fly ash. Pb tends to be adsorbed on the measurement line surfaces stronger than many other toxic elements and therefore proved difficult to collect and measure. Enrichment of Pb in the fine fly ash can be weakened by co-firing DW with PPR. Increasing the share of PPR up to 50% markedly reduces the toxic metal concentration in the finest fly ash. This, however, leads to increased mass flow of fine fly ash and increases the potential risks of operational problems such as bed agglomeration and fouling. (author)

  7. Characterization of fine and carbonaceous particles emissions from pelletized biomass-coal blends combustion: Implications on residential crop residue utilization in China

    Science.gov (United States)

    Xu, Yue; Wang, Yan; Chen, Yingjun; Tian, Chongguo; Feng, Yanli; Li, Jun; Zhang, Gan

    2016-09-01

    Bulk biofuel, biomass pellets and pelletized biomass-coal blends were combusted in a typical rural conventional household stove and a high-efficiency stove. Reductions in PM2.5, organic carbon (OC) and elemental carbon (EC) emissions were evaluated by comparing emission factors (EFs) among 19 combinations of biofuel/residential stove types measured using a dilution sampling system. In the low-efficiency stove, the average EFs of PM2.5, OC, and EC of biomass pellets were 2.64 ± 1.56, 0.42 ± 0.36, and 0.30 ± 0.11 g/kg, respectively, significantly lower than those burned in bulk form. EFPM2.5 and EFOC of pelletized biomass combustion in the high-efficiency stove were lower than those of the same biofuel burned in the low-efficiency stove. Furthermore, pelletized corn residue and coal blends burned in the high-efficiency stove could significantly decrease emissions. Compared with the bulk material burned in the low-efficiency stove, the reduction rates of PM2.5, OC and EC from pelletized blends in the high-efficiency stove can reach 84%, 96% and 93%, respectively. If the annually produced corn residues in 2010 had been blended with 10% anthracite coal powder and burnt as pellets, it would have reduced about 82% of PM2.5, 90-96% of OC and 81-92% of EC emission in comparison with burning raw materials in conventional household stoves. Given the low cost, high health benefit and reduction effect on atmospheric pollutants, pelletized blends could be a promising alternative to fossil fuel resources or traditional bulk biofuel.

  8. Spatial distribution of polycyclic aromatic hydrocarbons in soil, sediment, and combusted residue at an e-waste processing site in southeast China.

    Science.gov (United States)

    Leung, Anna O W; Cheung, Kwai Chung; Wong, Ming Hung

    2015-06-01

    The environmental pollution and health impacts caused by the primitive and crude recycling of e-waste have become urgent global issues. Guiyu, China is a major hotspot of e-waste recycling. In this study, the levels and distribution of polycyclic aromatic hydrocarbons in soil in Guiyu were determined to investigate the effect of e-waste activities on the environment and to identify possible sources of these pollutants. Sediment samples from a local duck pond, water gullies, a river tributary, and combusted residue from e-waste burning sites were also investigated. The general trend found in soil (Σ16 PAHs) was acid leaching site > duck pond > rice field > printer roller dump site > reservoir (control site) and ranged from 95.2 ± 54.2 to 5,210 ± 89.6 ng/g (dry wt). The highest average total PAH concentrations were found in combusted residues of wires, cables, and other computer electrical components located at two e-waste open burning sites (18,600 and 10,800 ± 3,940 ng/g). These were 195- and 113-fold higher than the PAH concentrations of soil at the control site. Sediment PAH concentrations ranged from 37.2 ± 6 to 534 ± 271 ng/g. Results of this study provide further evidence of significant input of PAHs to the environment attributed to crude e-waste recycling.

  9. BIODIESEL A PARTIR DE BIOETANOL Y ACEITE DE PALMA. ESTUDIO TECNOECONÓMICO

    Directory of Open Access Journals (Sweden)

    JENNYFER RAMOS-ABRIL

    2010-01-01

    Full Text Available El biodiesel representa una alternativa tecnológica para disminuir el consumo de combustibles fósiles. La transesterificación de aceites vegetales con metanol es la ruta más utilizada industrialmente por presentar alta conversión de triglicéridos y por la disponibilidad y precio de este alcohol. El metanol proviene fundamentalmente de metano, un insumo fósil, mientras que el bioetanol es renovable por lo que su uso representaría una mejor opción ambiental. Se analizó la prefactibilidad técnicoeconómica de la producción de biodiesel utilizando bioetanol y aceite de palma como materias primas. Se analizaron dos procesos (catálisis básica y ácida con ayuda del simulador Aspen Plus TM . Se simuló el biodiesel tomando como molécula representativa el oleato de etilo y se establecieron las propiedades de la mezcla ajustando el modelo NRTL a partir de datos experimentales del equilibrio líquidolíquido. El proceso resultaría rentable implementando la ruta catalítica ácida homogénea (H2SO4 siempre que la conversión sea superior a 95%.

  10. Kinetics of gasification and combustion of residues, biomass and coal in a bubbling fluidized bed; Die Kinetik der Vergasung und Verbrennung unterschiedlicher Abfaelle, Biomassen und Kohlen in der blasenbildenden Wirbelschicht

    Energy Technology Data Exchange (ETDEWEB)

    Hamel, S.; Krumm, W. [Siegen Univ. (Gesamthochschule) (Germany). Lehrstuhl fuer Energie- und Umweltverfahrenstechnik

    1998-09-01

    The combustion and gasification characteristics of Rhenish brown coal, domestic waste, waste plastics, wood and sewage sludge were investigated in a bubbling atmospheric fluidized bed in the laboratory scale. The materials were pyrolyzed in the fluidized bed in a nitrogen atmosphere. The residual coke was combuted in the presence of oxygen with varying operating parameters or else gasified in the presence of carbon dioxide. The different materials were characterized by global combustion rates, and kinetic parameters were determined for residual coke combustion. (orig.) [Deutsch] Das Verbrennungs- und Vergasungsverhalten von Rheinischer Braunkohle, Hausmuell, Restkunststoff, Holz und Klaerschlamm wurde in einer blasenbildenden, atmosphaerischen Laborwirbelschicht untersucht. Die Einsatzstoffe wurden in der mit Stickstoff fluidisierten Wirbelschicht pyrolysiert. Der verbleibende Restkoks wurde anschliessend unter Variation der Betriebsparameter mit Sauerstoff verbrannt oder mit Kohlendioxid vergast. Die unterschiedlichen Einsatzstoffe wurden durch globale Vebrennungsraten charakterisiert. Fuer die Restkoksverbrennung wurden kinetische Parameter ermittelt. (orig.)

  11. Case study of an MBT plant producing SRF for cement kiln co-combustion, coupled with a bioreactor landfill for process residues.

    Science.gov (United States)

    Grosso, Mario; Dellavedova, Stefano; Rigamonti, Lucia; Scotti, Sergio

    2016-01-01

    The paper describes the performances of the energy recovery pathway from the residual waste based on the production of a Solid Recovered Fuel (SRF) to be exploited via co-combustion in a cement kiln. The SRF is produced in a single stream Mechanical-Biological Treatment plant, where bio-drying of the waste is followed by mechanical refining in order to fulfil the quality requirements by the cement kilns. Peculiar of this MBT is the fact that sorting residues are disposed in a nearby landfill, managed according to a bioreactor approach, where landfill gas is collected for electric energy recovery. A detailed mass and energy balance of the system is presented based on one year operational data, followed by its Life Cycle Assessment. Results show that the system is energetically and environmentally effective, with most of the impacts being more than compensated by the savings of materials and energy. Major role in determining such outcome is the displacement of petcoke in the cement kiln, both in terms of its fossil CO2 emissions and of its life cycle impacts, including the trans-oceanic transport. To check the robustness of the results, two sensitivity analyses are performed on the landfill gas collection efficiency and on the avoided electric energy mix.

  12. Gasification and combustion technologies of agro-residues and their application to rural electric power systems in India

    Science.gov (United States)

    Bharadwaj, Anshu

    Biomass based power generation has the potential to add up to 20,000 MW of distributed capacity in India close to the rural load centers. However, the present production of biomass-based electricity is modest, contributing a mere 300 MW of installed capacity. In this thesis, we shall examine some of the scientific, technological and policy issues concerned with the generation and commercial viability of biomass-based electric power. We first consider the present status of biomass-based power in India and make an attempt to understand the reasons for low utilization. Our analysis suggests that the small-scale biomass power plants (Factor (PLF) that adversely affects their economic viability. Medium Scale units (0.5 MW--5 MW) do not appear attractive because of the costs involved in the biomass transportation. There is thus a merit in considering power plants that use biomass available in large quantities in agro-processing centers such as rice or sugar mills where power plants of capacities in excess of 5 MW are possible without biomass transportation. We then simulate a biomass gasification combustion cycle using a naturally aspirated spark ignition engine since it can run totally on biomass gas. The gasifier and engine are modeled using the chemical equilibrium approach. The simulation is used to study the impact of fuel moisture and the performance of different biomass feedstock. Biomass power plants when used for decentralized power generation; close to the rural load centers can solve some of the problems of rural power supply: provide voltage support, reactive power and peak shaving. We consider an innovative option of setting up a rural electricity micro-grid using a decentralized biomass power plant and selected a rural feeder in Tumkur district, Karnataka for three-phase AC load flow studies. Our results suggest that this option significantly reduces the distribution losses and improves the voltage profiles. We examine a few innovative policy options for

  13. Influence by physical properties of coal combustion residues (CCRs on dry root productivity of Withania somnifera grown in black cotton soil

    Directory of Open Access Journals (Sweden)

    Bhisham Yadav

    2013-05-01

    Full Text Available In India, presently ~40% Coal Combustion Residues (CCRs generated by burning of pulverized coal at Thermal Power Station is being used for cement, bricks, land reclamation etc. Now a day it has also been considered for agriculture applications. This study, an attempt was made to use of CCRs as soil modifier and micro fertilizer for cultivation of Withania somnifera under two cropping. Results revealed that production of dry root yields of Withania somnifera was found higher in T5 treatment (35.545g and 39.002g per plant as compared to control treatment (T1. It is showed significant (p<0.001% from all the treatments in both the years. The essential elements like Cu, Zn, Fe and Mn were found increasing trends in dry root of Withania somnifera with increase the concentration of CCRs application. This study is found the bulk utilization of CCRs for cultivation of Withania somnifera improved their root yield and chemical quality.

  14. Evaluation of laboratory and industrial meat and bone meal combustion residue as cadmium immobilizing material for remediation of polluted aqueous solutions: "chemical and ecotoxicological studies".

    Science.gov (United States)

    Coutand, M; Deydier, E; Cyr, M; Mouchet, F; Gauthier, L; Guilet, R; Savaete, L Bernues; Cren, S; Clastres, P

    2009-07-30

    Meat and Bone Meals (MBM) combustion residues (ashes) are calcium and phosphate-rich materials. The aim of this work is to evaluate ashes efficiency for remediation of cadmium-contaminated aqueous solutions, and to assess the bioavailability of cadmium on Xenopus laevis larvae. In this study both industrial (MBM-BA) and laboratory (MBM-LA) ashes are compared regarding their efficiency. Kinetic investigations reveal that cadmium ions are quickly immobilized, with a maximum cadmium uptake at 57 mg Cd(2+)/g of ashes for MBM-LA, two times higher than metal uptake quantity of MBM-BA, in our experimental conditions. Chemical and X-ray diffraction analysis (XRD) reveal that Cd(2+) is mainly immobilized as Ca(10-x)Cd(x)(PO(4))(6)(OH)(2) by both ashes, whereas otavite, Cd(CO(3)), is also involved for MBM-LA in cadmium uptake. Otavite formation could be explained by the presence of carbonates in MBM-LA, as observed by IR. Genotoxicity of cadmium solution on Xenopus larvae is observed at 0.02, 0.2 and 2mg Cd(2+)/L. However addition of only 0.1g/L MBM-LA inhibits these effects for the above concentration values whereas Cd(2+) bioaccumulation in larvae's liver is similar for both experiments, with and without ashes.

  15. Tratamiento de los aceites vegetales usados, como materia prima para la elaboración de biodiésel en la ciudad de Arequipa

    OpenAIRE

    Sotomayor Zúñiga, Rosa María; Huaco Álamo, Hortencia Elena; Cuentas Machicao, Rafael

    2006-01-01

    Las hipótesis de la investigación son: a) Se puede obtener combustible ecológico (biodiésel) a partir de aceites usados, mediante la transesterificación, usando alcohol etílico, y b) Se puede disminuir el grado de contaminación de las aguas efluentes de los principales restaurantes de Arequipa, mediante el tratamiento de los aceites usados que se generan y a través de asesoramiento técnico correspondiente en la separación de este desecho.Para la investigación se tomaron en cuenta las siguient...

  16. Actividad antioxidante de compuestos aislados del residuo no-volátil del aceite esencial de naranja.

    Directory of Open Access Journals (Sweden)

    Vargas-Arispuro, L.

    1998-04-01

    Full Text Available There has been a growing interest in the food industry and in preventive medicine to search for «natural antioxidants». Therefore the objetive of this study was to evaluate the antioxidant activity of the non-volatile residue of essential orange oil in the oxidation of unrefined and freshly extracted olive oil. Essential orange oil was distilled to obtain a non-volatile residue and fracctionated on a Silica Gel 60 column. The antioxidant activity was determined by measuring peroxide value obtained after heating olive oil at 70 °C for 48 h. Six compounds were isolated and purified, four of these had antioxidant activity, α-tocopherol and three methoxylated flavones were identified using spectroscopic methods. This study confirmed that non-volatile fractions of essential orange oil contain natural antioxidants diferent from α-tocopherol.

    Existe un creciente interés en la industria alimentaria y en la medicina preventiva por la búsqueda de «antioxidantes naturales», por lo que nos planteamos evaluar la actividad antioxidante del residuo no volátil del aceite esencial de naranja contra la oxidación del aceite de oliva sin retinar y de reciente extracción. Mediante destilación del aceite esencial de naranja se obtuvo el residuo no-volátil, el cual se fraccionó en columna de silica gel 60. La actividad antioxidante fue medida por el valor de peróxidos producidos por el aceite de oliva al provocar la oxidación por calentamiento a 70 °C durante 48 h. Se aislaron seis compuestos mediante HPLC preparativo de los cuales cuatro tuvieron actividad antioxidante. Usando métodos espectroscópicos se identificaron α-tocoferol y tres flavonas metoxiladas. Con este estudio se confirmó que la fracción no volátil del aceite esencial de naranja contiene antioxidantes naturales diferentes al α-tocoferol.

  17. Romania's experience in using woody residues as a combustible for central heating; L'experience roumaine de l'utilisation des residus ligneux comme combustible pour le chauffage central

    Energy Technology Data Exchange (ETDEWEB)

    Lavrov, G. [Inst. des Etudes et des Projets Energetiques (Romania)

    2004-06-01

    Romania's national policy for renewable resources promotes the use of clean and renewable energy. The national policy is intended to increase the national contribution of renewable energy sources and to develop non-conventional technologies for exploiting renewable resources. This paper described two examples where woody residues are used as a combustible for central heating. The first example describes a local industry in Campeni, a village of 10,000 people located near the Aires River, which produces 54,000 tons of ligneous waste each year. A central heating plant was modernized to accept this waste as a fuel. Two old boilers were replaced with two modern, Romanian-made boilers that produce a calorific output of 8,790 kJ/kg. The efficiency of the new boilers is 83 per cent. The benefits of this modernization have been a significant reduction in pollution of the Aires River by reducing the number of ligneous waste dumped into the river. Carbon dioxide and SOx emissions have also been reduced by replacing fossil fuel with biomass. The thermal comfort of the buildings served by the heating plant has also improved because the new boilers produce 88 per cent more heat. The second example focuses on the village of Tasca in Moldavia, a forest rich region of Romania where the wood dust from local saw mills has polluted the Bicaz and Damuc Rivers. A project was launched to develop an urban district heating system by installing a new 2.5 MW boiler fueled by sawdust and ligneous waste. Consumers were connected to the thermal energy distribution system. A separate system was created to collect waste from the sawmills. The benefits of this project have been a significant reduction in the pollution of the rivers, increased comfort levels in houses and a significant reduction in air pollution because the old individual and inefficient heating systems were replaced with an efficient central heating system. 1 tab.

  18. El uso de fluidos supercríticos en la industria de aceites alimentarios

    Directory of Open Access Journals (Sweden)

    Esquível, M.

    1993-02-01

    Full Text Available Residual olive oil extraction experiments were made with carbon dioxide under pressures of 12 and 15 MPa and 308.15, 313.15 and 318.15 K of temperature. We may conclude through the experiments, that under these pressures and temperature of 313.15 K there is no selected extraction of fatty acids, and higher recovery rates can be obtained in a short period of time.

    Se han realizado experiencias de extracción de aceite de orujo con dióxido de carbono a presiones de 12 y 15 MPa y a las temperaturas de 308.15, 313.15 y 318.15 K. Las pruebas efectuadas permiten concluir que en esta gama de presiones y a la temperatura de 313.15 K no existe extracción selectiva de los ácidos grasos y que se obtienen rendimientos elevados en relativamente poco tiempo.

  19. Bioaccumulation and effects of metals and trace elements from aquatic disposal of coal combustion residues: recent advances and recommendations for further study.

    Science.gov (United States)

    Rowe, Christopher L

    2014-07-01

    Advances have been made recently in assessing accumulation and effects of coal combustion residues (CCR). I provide a brief review of recent advancements, provide a tabulated summary of results of recent work, and put forth recommendations for future studies. One advancement is that mercury accumulation has begun to receive (limited) attention, whereas it had rarely been considered in the past. Additionally, some constituents of CCR have been shown to be accumulated by adults and transferred to offspring, sometimes compromising offspring health. Studies have demonstrated that amphibians, possessing complex life cycles, may accumulate and transfer some contaminants to terrestrial systems. Some study has been given to molecular and cellular effects of CCR exposure, although these studies have been limited to invertebrates. Population models have also been applied to CCR affected systems and have shown that CCR may affect animal populations under some conditions. In light of these advancements, there are several topics that require further assessment. First, more attention to Hg and its dynamics in CCR affected systems is warranted. Hg can be highly accumulative and toxic under some conditions and may interact with other components of CCR (notably Se), perhaps altering accumulation and effects of the contaminant mixtures. Second, further investigation of maternal transfer and effects of CCR contaminants need to be conducted. These studies could benefit from incorporation of quantitative models to project impacts on populations. Finally, more attention to the organic constituents of CCR (PAHs) is required, as a focus on inorganic compounds only may restrict our knowledge of contaminant dynamics and effects as a whole. While further studies will shed light on some chemical and biological nuances of exposure and effect, information available to date from numerous study sites implicates CCR as a bulk effluent that presents risks of bioaccumulation and effects on organisms

  20. User`s guide for the Augmented Computer Exercise for Inspection Training (ACE-IT) software

    Energy Technology Data Exchange (ETDEWEB)

    Dobranich, P.R. [Sandia National Labs., Albuquerque, NM (United States). Cooperative Monitoring Center and Regional Security; Horak, K.E.; Hagan, D.; Evanko, D.; Nelson, J.; Ryder, C.; Hedlund, D. [Ogden Environmental and Energy Services, Inc., Albuquerque, NM (United States)

    1997-09-01

    The on-site inspection provisions in many current and proposed arms control agreements require extensive preparation and training on the part of both the Inspection Teams (inspectors) and Inspected Parties (host). Current training techniques include table-top inspections and practice inspections. The Augmented Computer Exercise for Inspection Training (ACE-IT), an interactive computer training tool, increases the utility of table-top inspections. ACE-IT has been designed to provide training for challenge inspections under the Chemical Weapons Convention (CWC); however, this training tool can be modified for other inspection regimes. Although ACE-IT provides training from notification of an inspection through post-inspection activities, the primary emphasis of ACE-IT is in the inspection itself--particularly with the concept of managed access. ACE-IT also demonstrates how inspection provisions impact compliance determination and the protection of sensitive information. This User`s Guide describes the use of the ACE-IT training software.

  1. Assessment of lead ecotoxicity in water using the amphibian larvae (Xenopus laevis) and preliminary study of its immobilization in meat and bone meal combustion residues.

    Science.gov (United States)

    Mouchet, F; Cren, S; Cunienq, C; Deydier, E; Guilet, R; Gauthier, L

    2007-04-01

    Lead (Pb) is a major chemical pollutant of the environment. It has been associated with human activities for the last 6000 years. Quite rightly, it remains a public health concern today. The present investigation evaluates the toxic potential of Pb in larvae of the toad Xenopus laevis after 12 days exposure in lab conditions. Acute toxicity, genotoxicity and Pb bioaccumulation were analyzed. The genotoxic effects were analyzed in the circulating blood from the levels of micronucleus induction according to the French standard micronucleus assay (AFNOR 2000 Association française de normalization. Norme NFT 90-325. Qualité de l'Eau. Evaluation de la génotoxicité au moyen de larves d'amphibien (Xenopus laevis, Pleurodeles waltl)). Lead bioaccumulation was analyzed in the liver of larvae at the end of exposure. Moreover, the toxic potential of lead, in aquatic media, was investigated in the presence of meat and bone meal combustion residues (MBMCR) known to be rich in phosphates and a potential immobiliser of lead. Previously, acute toxicity and genotoxicity of MBMCR alone were evaluated using Xenopus larvae. The results obtained in the present study demonstrated: (i) that lead is acutely toxic and genotoxic to amphibian larvae from 1 mg Pb/l and its bioaccumulation is significant in the liver of larvae from the lowest concentration of exposure (1 microg Pb/l), (ii) MBMCR were not acutely toxic nor genotoxic in Xenopus larvae, (iii) lead in presence of MBMCR induced inhibition or reduction of the toxic and genotoxic potential of lead in water at concentrations that do not exceed the capacity of MBMCR of Pb-binding (iv) Pb accumulation in larvae exposed to lead with MBMCR in water was lower than Pb-accumulation in larvae exposed to lead alone except at the concentration of 0.01 mg Pb/l suggesting complex mechanisms of MBMCR interaction in organisms. The results confirm the high toxicity and genotoxicity of lead in the aquatic compartment and suggest the potential

  2. Obtención de los alcoholes de aceite de jojoba utilizando óxido de calcio derivado de fuentes naturales

    OpenAIRE

    Sánchez Rodríguez, Marcos

    2015-01-01

    Actualmente, una gran parte de la investigación está relacionada con la generación de productos con un alto valor añadido a partir de materias primas renovables que sean rentables económicamente y que no dañen al medio ambiente. Por otra parte, los biocombustibles se presentan como una fuente de energía que puede sustituir en gran medida a los combustibles fósiles. En esta tesis, se han aunado estos dos conceptos para la concepción de una biorefinería a partir de aceite de jojoba usando óxido...

  3. Determinación de hidrocarburos en lodos residuales del tanque de almacenamiento de aceites usados de Etapa EP., posterior al tratamiento con Ecosoil, Sphag Sorb y compostaje

    OpenAIRE

    2014-01-01

    La Empresa Municipal Pública de Telecomunicaciones, Agua Potable, Alcantarillado y Saneamiento, ETAPA EP., preocupada por la mala disposición que se da a los hidrocarburos: lubricantes y combustibles, lleva adelante, el “Programa de Recolección de Aceites Minerales Usados”, con el propósito de recolectarlos para disponer de ellos de una manera ambientalmente segura, lo que ha originado el inconveniente de la generación de lodos contaminados con hidrocarburos como resultado de la sedimentación...

  4. Experimental findings on thermal use of residues and biofuels in circulating fluidized bed combustion systems; Experimentelle Ergebnisse zur thermischen Nutzung von Rest- und Biobrennstoffen in zirkulierenden Wirbelschichtfeuerungen

    Energy Technology Data Exchange (ETDEWEB)

    Bernstein, W.; Brunne, T.; Girndt, H. [Technische Univ. Dresden (Germany); Albrecht, J. [Lurgi Lentjes Babcock, Frankfurt am Main (Germany); Youssef, M. [Minia Univ. (Egypt)

    1996-12-31

    The energy Engineering Institute of Dresden Technical University investigated the combustion and emission characteristics of a number of combustion systems, including a circulating fluidized bed system with a capacity of 0.3 MW{sub th}. Egypt`s sugar cane industry produces large volumes of bagasse. The conbustion and emission characteristics of this biofuel in a circulating fludized bed combustion systems were investigated in a joint research project of the University of Minia and Dresden Technical University. (orig.) [Deutsch] Am Institut fuer Energietechnik der TU Dresden wird das Verbrennungs- und Emissionsverhalten verschiedenster Brennstoffe in unterschiedlichen Feuerungssystemen untersucht. Neben anderen Pilotanlagen steht eine zirkulierende Wirbelschichtfeuerung (ZWFS) mit einer Leistung von 0.3 MW{sub th} zur Verfuegung. In der Zuckerrohrindustrie Aegyptens fallen grosse Mengen von Bagasse an. In einer gemeinsamen Forschungsarbeit zwischen der Universitaet Minia und der TU Dresden sollte das Verbrennungs- und Emissionsverhalten dieses Biobrennstoffes in einer ZWSF untersucht werden. (orig)

  5. Developments in the technology for the combustion of water emulsions in Mexican fuel oil; Desarrollos en la tecnologia para la combustion de emulsiones agua en combustoleo mexicano

    Energy Technology Data Exchange (ETDEWEB)

    Diego, Antonio Marin; Martinez Flores, Marco A.; Tamayo Flores, Gustavo; Alarcon Quiroz, Ernesto; Melendez Cervantes, Carlos [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico)

    2001-07-01

    The residual petroleum oil (fuel oil) is the most used fuel in boilers of electrical and industrial power stations. Nevertheless, the use of this fuel can generate diverse problems such as the elevated particle emissions, that affect the boiler efficiency, darken the visibility by the smoke that leaves the chimneys and is emitted to the Environment. In addition, sulfur trioxide is produced, which reacts with the water present in the combustion gases, forming sulfuric acid that, when emitted, also affects the visibility of the plume and can be condensed, originating corrosion and increased accumulation of deposits in the boilers. The experimental research was made in a comparative base, between combustion tests of fuel oil, with emulsions where the water concentration and the size of the drops of this one was varied. A diagram of the supply of fuel and preparation of emulsions in a pilot furnace is shown. The article contains graphs of the effect of the water concentration of the emulsions in the particulate emission. The article contains figures of the cenospheres produced by the fuel oil combustion (500 x) and the ones produced by the combustion with 5% of water (500 x). Also shows graphs of the effect of the water drop size of emulsions in the particulate emission, of the reduction of the sulfur trioxide with soluble magnesium products in the water of emulsions, and of the free particle acidity with neutralizers of water emulsions of soluble magnesium. [Spanish] El aceite residual de petroleo (combustoleo) es el combustible mas utilizado en calderas de centrales electricas e industriales. Sin embargo, el uso de este combustible puede generar diverso problemas como las emisiones elevadas de particulas, que afectan la eficiencia de una caldera, obscurecen la visibilidad pero el humo que sale de las chimeneas y se emiten al medio ambiente. Ademas se produce trioxido de azufre, el cual reacciona con el vapor de agua presente en los gases de combustion, formado acido

  6. The effect of low-NOx combustion on residual carbon in fly ash and its adsorption capacity for air entrainment admixtures in concrete

    DEFF Research Database (Denmark)

    Pedersen, Kim Hougaard; Jensen, Anker Degn; Dam-Johansen, Kim

    2010-01-01

    been combusted in an entrained flow reactor to test the impact of changes in operating conditions and fuel type on the AEA adsorption of ash and NOx formation. Increased oxidizing conditions, obtained by improved fuel-air mixing or higher excess air, decreased the AEA requirements of the produced ash...

  7. Fraccionamiento térmico de aceite de pollo

    Directory of Open Access Journals (Sweden)

    Grompone, María A.

    1994-12-01

    Full Text Available Properties of chicken oil industrially obtained in Uruguay are studied.
    Dry fractionation of neutralized and degummed chicken oil is carried out at laboratory employing two different temperature programmes. The oleine obtained at the final temperature of 13°C (yield of 79.2%, remains clear at 0°C during 20 minutes, and the one obtained at 9°C (yield of 76.3% during 240 minutes. The latter could be used as a substitute of neatsfoot oil.
    Melting points of stearines vary from 39.5°C to 41.5°C. Therefore, and given their composition, they could be used in food industry.

    Se estudian las propiedades del aceite de pollo obtenido industrialmente en el Uruguay.
    Se realizan, a nivel de laboratorio, fraccionamientos térmicos en seco de aceite de pollo neutralizado y desgomado, empleando dos programas de temperatura diferentes. La oleína obtenida a la temperatura final de 13°C (con un rendimiento del 79,2% permanece límpida a la temperatura de 0°C durante 20 minutos y la obtenida a 9°C (con un rendimiento del 76,3%, durante 240 minutos. Esta última podría ser utilizada como sustituto del aceite de patas de vacuno.
    Las estearinas obtenidas tienen puntos de fusión entre 39,5°C y 41,5°C. Por ello y por su composición podrían ser empleadas en productos alimenticios.

  8. Estudio comparativo de las características físico-químicas del aceite de sacha inchi (Plukenetia volubilis l., aceite de oliva (Olea europaea y aceite crudo de pescado

    Directory of Open Access Journals (Sweden)

    Luz María Paucar-Menacho

    2015-01-01

    Full Text Available Los aceites vegetales tales como el aceite de sacha inchi (ASI y oliva (AO contienen ácidos grasos mono-insaturados (omega-9 y poliinsaturados (omega-6, y pequeñas cantidades de omega-3. Por el contrario, los aceites de origen marino como el aceite crudo de pescado (ACP se caracterizan por su alto contenido en omega-3. El objetivo de la presente investigación fue determinar y comparar las características físico-químicas de estos tres aceites a fin de establecer cuál es el mejor para el uso alimentario. El Índice de acidez, índice de refracción y densidad relativa se determinó por métodos oficiales AOAC, y el tiempo de vida útil por el método Rancimat, a tres temperaturas (100 °C; 120 °C y 150 °C, extrapolando los resultados a 25 °C.Los resultados obtenidos en la caracterización fisicoquímica indican que estos aceites son significativamente diferentes. Los índices de acidez en % de ácido oleico fueron de 1,08, 1,14 y 1,561 para ASI, AO y ACP respectivamente. Los índices de refracción (20 °C fueron 1,475, 1,469 y 1,481 para ASI, AO y ACP respectivamente, la densidad relativa fue 0,9283, 0,9152 y 0,9308 para ASI, AO y ACP respectivamente. La vida útil para ASI, AO y ACP fue de 93, 137 y 2 días respectivamente. La composición de ácidos grasos tanto en los aceites de origen vegetal y marino además de su vida útil, imparte gran importancia desde el punto de vista nutricional, ya que están contenidos significativamente en los aceites estudiados. Los resultados indican la importancia de este tipo de aceites en la alimentación humana.

  9. An Evaluation of the Automated Cost Estimating Integrated Tools (ACEIT) System

    Science.gov (United States)

    1989-09-01

    C~4p DTIC S ELECTE fl JAN12 19 .1R ~OF S%. B -U AN EVALUATION OF THE AUTOMATED COST ESTIMATING INTEGRATED TOOLS ( ACEIT ) SYSTEM THESIS Caroline L...Ohio go 91 022 AFIT/GCA/LSQ/89S-5 AN EVALUATION OF THE AUTOMATED COST ESTIMATING INTEGRATED TOOLS ( ACEIT ) SYSTEM THESIS Caroline L. Hanson Major, USAF...Department of Defense. AFIT/GCA/LSQ/89S-5 AN EVALUATION OF THE AUTOMATED COST ESTIMATING INTEGRATED TOOLS ( ACEIT ) SYSTEM THESIS Presented to the

  10. Calidad del aceite de las brásicas cultivadas en Galicia

    OpenAIRE

    Cartea González, María Elena; Vilar, Marta; Francisco Candeira, Marta; Haro, Antonio de

    2009-01-01

    Los cultivos de brásicas utilizados para la obtención de aceite son la colza (Brassica napus), la nabina (B. rapa) y las mostazas (B.carinata y B. juncea). Entre todos ellos, el cultivo de colza es el más importante. Estas especies son a nivel mundial una de las fuentes más importantes de aceites vegetales, tanto para uso alimenticio como industrial. La calidad del aceite depende fundamentalmente de su contenido cualitativo y cuantitativo en los ácidos grasos que lo componen. En este senti...

  11. Contenido de plomo y cadmio en aceites de girasol

    Directory of Open Access Journals (Sweden)

    López Martínez, M. C.

    2001-08-01

    Full Text Available We have studied the lead and cadmium content in 21 samples of sunflower oil from Andalucía (Southern Spain. These elements are toxicological importance and the sunflower oil is widely consumed in Spain. Samples were mineralized with nitric acid and vanadium pentoxide as catalyst, and ana lyzed using electrothermal atomization atomic absorption spectroscopy. The temperature-time programme for the graphite furnace was optimized for each element, and the accuracy, precision, sensitivity and detection limit of the method were evaluated. Concentrations of lead ranged from not detectable to 167.58 μg/kg and cadmium concentrations ranged from 0.87 to 8.30 μg/kg. The data obtained are not excessive and similar to those mentioned by other authors; however, one sample of the total analyzed surpassed the limit of 0.1 ppm of lead proposed by the Spanish and European Legislation. A statistical significative correlation has been established between Pb and Cd levels (p Se ha determinado el contenido de plomo y cadmio en 21 muestras de aceite de girasol, todas ellas producidas en Andalucía (Sur de España. Ambos elementos tienen una gran importancia toxicológica y el aceite de girasol es muy consumido en España. Las muestras han sido mineralizadas con ácido nítrico, utilizando pentóxido de vanadio como catalizador, y analizadas mediante espectroscopia de absorción atómica con atomización electrotérmica. Se ha optimizado el programa temperatura-tiempo del horno de grafito para cada elemento y se ha evaluado la exactitud, precisión, sensibilidad y límite de detección del método. Las concentraciones de plomo han oscilado entre no detectables y 167.58 μg/kg y las concentraciones de cadmio entre 0.87 y 8.30 μg/kg. Estos datos no resultan excesivos y concuerdan con los aportados por otros autores; no obstante, una de las muestras analizadas supera el límite máximo de 0.1 ppm de Pb establecido en las Legislaciones Española y Europea. Se

  12. Kinetic models for pyrolysis and combustion of sewage sludge[Held jointly with the 4. Canadian organic residuals and biosolids managment conference

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez, R.; Udaquiola, S. [Univ. Nacional de San Juan, San Juan (Argentina). Lab. Tec. Amb., Inst. de Ing. Qca; Gauthier, D; Flamant, G. [PROMES-CNRS, Font-Romeu Odeillo (France); Mazza, G. [Univ. Nacional Del Comahue, Neuquen (Argentina). Dept. de Quimica; Martinez, O. [Univ. Nacional de la Plata, La Plata (Argentina). CINDECA-CONICET

    2007-07-01

    In thermochemical conversion processes that produce energy, the kinetics of waste decomposition must be considered. The rate of mass loss due to thermal decomposition determines the available fuel on the fire triangle of heat, fuel and oxygen. Heating rates in thermobalance experiments are low, and are often used to study the primary reactions in the decomposition of solids since their cracking is negligible. Thermogravimetry is an option for determining the decomposition profile of a solid in terms of its temperature versus the kinetics of its decomposition. This paper presented the thermal analysis and results of a study that used thermogravimetric analyses on dry samples of sewage sludge from San Juan, Argentina in an inert and oxidative atmosphere. Three peaks were observed in all differential thermogravimetric curves during the organic matter decomposition. In order to explain the experimental data, various reaction schemes were set up. The first two schemes considered 3 fractions decomposing in parallel during pyrolysis, with oxidative pyrolysis of all fractions during combustion or only two. The third scheme considered the decomposition of 2 fractions only but with dissymmetrical behavior during the whole pyrolysis and combustion phenomenon. It was concluded that the simulations were a good agreement with the experimental data for the first 2 schemes only, and overall, the fit was better with the second scheme. 11 refs., 4 figs.

  13. Propiedades mecánicas de aceites y grasas vegetales

    Directory of Open Access Journals (Sweden)

    de Dios Alvarado, Juan

    1995-10-01

    Full Text Available Data of mechanical properties are presented for crude oils from avocado pulp, lupin grain, peanuts, soybean, sesame, cotton, castor-oil, linseed and passion fruit seeds; refined oils from sunflower, corn, peanut, olive and soybean; and cocoa, coconut, palm-oil and kernel palm-oil fats.
    Correlation equations which describe the effect of temperature on the refractive index, density, viscosity and surface tension are obtained, and values of coefficient of expansion and activation energy for flow are calculated.

    Se presentan los valores de las principales propiedades mecánicas determinadas en aceites crudos extraídos de pulpa de aguacate, granos o semillas de sésamo, algodón, altramuz o chocho, ricino, linaza, maní o cacahuete, maracuyá y soja; aceites refinados provenientes de semillas de girasol, germen de maíz, maní, oliva y soja; grasas extraídas de cacao, copra de coco, pulpa de palma africana y almendras de palma africana.
    Con los datos experimentales se establecen ecuaciones de correlación que describen el efecto de la temperatura sobre el índice de refracción, la densidad, la viscosidad y la tensión superficial. En cada producto, con los datos de la densidad se calcula el coeficiente volumétrico de expansión térmica y con los de la viscosidad la energía de activación.

  14. TRANSESTERIFICACIÓN DE ACEITE DE HIGUERILLA CRUDO UTILIZANDO CATALIZADORES HETEROGÉNEOS - ESTUDIO PRELIMINAR

    Directory of Open Access Journals (Sweden)

    GINA HINCAPIÉ

    2011-01-01

    Full Text Available Se estudió la producción de biodiesel mediante transesterificación de aceite de higuerilla crudo con etanol y metanol usando catalizadores heterogéneos. Los catalizadores utilizados fueron el óxido de calcio, carbonato de sodio y de potasio y un silicato de zinc con estructura tipo hemimorfita. La formación de alquil-ésteres fue cuantificada mediante cromatografía de gases. Las mayores conversiones fueron obtenidas con carbonato de potasio en etanol y con la hemimorfita en metanol a una concentración de 3% con respecto al peso de aceite, usando una relación molar de alcohol a aceite de 60 y luego de la pre-esterificación del aceite crudo. Bajo estas condiciones la conversión con carbonato de potasio fue 74.9% y con la hemimorfita fue 66.2%.

  15. Extracción de aceite de aguacate: Un experimento industrial

    Directory of Open Access Journals (Sweden)

    Martínez Nieto, L.

    1992-02-01

    Full Text Available The results of an industrial experiment to obtain avocado oil by continuous process similar to that for obtaining olive oil are analyzed. Possible ways of improving the method and thus the yield are pointed out.

    Se analizan los resultados obtenidos en un experimento industrial de obtención de aceite de aguacate por un proceso continuo similar al de obtención de aceite de oliva, indicando las posibles modificaciones para mejorar el rendimiento.

  16. Aceite esencial de tomillo como antioxidante y conservador de hamburguesas funcionales

    OpenAIRE

    Medina, Rosa; Dupertuis, Liliana; Amadio, Claudia; Dip, Gladys; Zimmermann, Mónica; Espejo, Cecilia; Raimondo, Emilia

    2003-01-01

    Para determinar el poder antioxidante y conservante del aceite esencial de tomillo mendocino (Acantholippia seriphioides) en hamburguesas funcionales, conservadas a 4 ± 0.5 °C, se elaboraron medallones utilizando: 83 % carne vacuna 5 % grasa vacuna 5 % salvado de avena 5 % texturizado de soja 2 % sustituto graso 0.08 g NaCl/kg aceite esencial de tomillo (AET) 106 ufc/g ...

  17. Technical manual for the Augmented Computer Exercise for Inspection Training (ACE-IT) software

    Energy Technology Data Exchange (ETDEWEB)

    Dobranich, P.R. [Sandia National Labs., Albuquerque, NM (United States). Cooperative Monitoring Center and Regional Security; Horak, K.E.; Hagan, D.; Evanko, D.; Nelson, J.; Ryder, C.; Hedlund, D. [Ogden Environmental and Energy Services, Inc., Albuquerque, NM (United States)

    1997-09-01

    The on-site inspection provisions in many current and proposed arms control agreements require extensive preparation and training on the part of both the Inspection Teams (inspectors) and Inspected Parties (host). Current training techniques include table-top inspections and practice inspections. The Augmented Computer Exercise for Inspection Training (ACE-IT), an interactive computer training tool, increases the utility of table-top inspections. ACE-IT has been designed to provide training for challenge inspections under the Chemical Weapons Convention (CWC); however, this training tool can be modified for other inspection regimes. Although ACE-IT provides training from notification of an inspection through post-inspection activities, the primary emphasis of ACE-IT is in the inspection itself--particularly with the concept of managed access. ACE-IT also demonstrates how inspection provisions impact compliance determination and the protection of sensitive information. This Technical Manual describes many of the technical aspects of the ACE-IT training software.

  18. Exercise manual for the Augmented Computer Exercise for Inspection Training (ACE-IT) software

    Energy Technology Data Exchange (ETDEWEB)

    Dobranich, P.R.; Widney, T.W.; Goolsby, P.T. [Sandia National Labs., Albuquerque, NM (United States). Cooperative Monitoring Center and Regional Security; Nelson, J.D.; Evanko, D.A. [Ogden Environmental and Energy Services, Inc., Albuquerque, NM (United States)

    1997-09-01

    The on-site inspection provisions in many current and proposed arms control agreements require extensive preparation and training on the part of both the Inspected Party and the Inspection Team. Current training techniques include table-top inspections and practice inspections. The Augmented Computer Exercise for Inspection Training (ACE-IT), an interactive computer training tool, increases the utility of table-top inspections. ACE-IT has been designed to provide training for a hypothetical challenge inspection under the Chemical Weapons Convention (CWC); however, this training tool can be modified for other inspection regimes. Although ACE-IT provides training from notification of an inspection through post-inspection activities, the primary emphasis of ACE-IT is in the inspection itself--particularly with the concept of managed access. ACE-IT also demonstrates how inspection provisions impact compliance determination and the protection of sensitive information. The Exercise Manual supplements the ACE-IT software by providing general information on on-site inspections and detailed information for the CWC challenge inspection exercise. The detailed information includes the pre-inspection briefing, maps, list of sensitive items, medical records, and shipping records.

  19. Computational Combustion

    Energy Technology Data Exchange (ETDEWEB)

    Westbrook, C K; Mizobuchi, Y; Poinsot, T J; Smith, P J; Warnatz, J

    2004-08-26

    Progress in the field of computational combustion over the past 50 years is reviewed. Particular attention is given to those classes of models that are common to most system modeling efforts, including fluid dynamics, chemical kinetics, liquid sprays, and turbulent flame models. The developments in combustion modeling are placed into the time-dependent context of the accompanying exponential growth in computer capabilities and Moore's Law. Superimposed on this steady growth, the occasional sudden advances in modeling capabilities are identified and their impacts are discussed. Integration of submodels into system models for spark ignition, diesel and homogeneous charge, compression ignition engines, surface and catalytic combustion, pulse combustion, and detonations are described. Finally, the current state of combustion modeling is illustrated by descriptions of a very large jet lifted 3D turbulent hydrogen flame with direct numerical simulation and 3D large eddy simulations of practical gas burner combustion devices.

  20. Métodos de monitorización de la reacción de transesterificación de aceite de girasol para la obtención de biodiésel

    OpenAIRE

    Villares Asiain, Javier

    2010-01-01

    El biodiesel consiste en una mezcla de los ésteres metílicos de los ácidos grasos contenidos en los triglicéridos que constituyen la base de los aceites vegetales o las grasas de origen animal. En España, el producto debe cumplir las especificaciones de la norma UNE-EN 14214, que establece los rangos de valores para una serie de propiedades físicas y químicas del biodiesel con el fin de que resulte apto para su empleo como combustible de automoción [25]. La producción industrial d...

  1. Evaluación oxidativa de las mezclas de aceites de leguminosas del Desierto de Sonora con aceites de maíz y soja durante su almacenamiento

    Directory of Open Access Journals (Sweden)

    Vázquez-Moreno, L.

    2001-12-01

    Full Text Available During storage, oils from seeds of wild legumes of the Sonoran Desert have shown greater stability than oils derived from conventional sources. In this work, oxidation process was evaluated during the storage (122 day of mixtures of oils: Mezquite Prosopis juliflora, Gatuña Mimosa grahamii, Palo fierro Olneya tesota, Vino rama Acacia constricta, Palo de brea Cercidium praecox and Palo verde Parkinsonia aculeata with oils from soy and maize. Ratios were 1:1, 2:1 and 3:1. Evaluated parameters included: Peroxides (P.V., Iodine (I.V., Acid (A.V., p-Anisidine (p-A values. Results showed that mixtures containing wild and maize oil showed 2-4 meq/Kg as initial values of iodine, while after 122 days of storage the value was 4-7 meq/Kg. Mixtures containing soy oil presented 3-6 meq-Kg initially, and 8-15 meq-Kg were detected at the end experiment. No differences were observed in I.V. and A.V. values in maize mixtures. On the contrary, mixtures containing soy oil presented increments in I.V. Also, A.V. presented a slight increment in 1:1 mixtures. p-Anisidine values presented and small increment in maize mixtures (3:1 ratio while this increment was larger in mixtures containing soy oils and Gatuña or Palo fierro oil. These latter oils when were mixed with maize oils presented the lowest increments in all evaluated indexes.The oils of palo fierro and blended gatuña with oil of corn didn’t present changes in their concentration in the palmitic and araquidic acid during the storage. The concentration of the oleic acid in the mezquite oils (3:1, gatuña (1:1, 2:1 and 3:1, vinorama (3:1, as well as the linoleic and erucic acids in gatuña in their three mixtures didn’t present changes neither alteration during the storage, for what you are considered the oils of palo fierro, gatuña and vinorama the most stable in the present study.Los aceites de semillas de leguminosas silvestres han mostrado mayor estabilidad que algunos aceites convencionales

  2. Field determination of biomass burning emission ratios and factors via open-path FTIR spectroscopy and fire radiative power assessment: headfire, backfire and residual smouldering combustion in African savannahs

    Directory of Open Access Journals (Sweden)

    M. J. Wooster

    2011-02-01

    Full Text Available Biomass burning emissions factors are vital to quantifying trace gases releases from vegetation fires. Here we evaluate emissions factors for a series of savannah fires in Kruger National Park (KNP, South Africa using ground-based open path Fourier transform infrared (FTIR spectroscopy and an infrared lamp separated by 150–250 m distance. Molecular abundances along the extended open path are retrieved using a spectral forward model coupled to a non-linear least squares fitting approach. We demonstrate derivation of trace gas column amounts for horizontal paths transecting the width of the advected plume, and find, for example, that CO mixing ratio changes of ~0.001 μmol mol−1 (~10 ppbv can be detected across the relatively long optical paths used here. We focus analysis on five key compounds whose production is preferential during the pyrolysis (CH2O, flaming (CO2 and smoldering (CO, CH4, NH3 fire phases. We demonstrate that well constrained emissions ratios for these gases to both CO2 and CO can be derived for the backfire, headfire and residual smouldering combustion stages of these savannah fires, from which stage-specific emission factors can then be calculated. Headfires and backfires in general show similar emission ratios and emission factors, but those of the residual smouldering combustion stage can differ substantially (e.g., ERCH4/CO2 up to ~7 times higher than for the flaming stages. The timing of each fire stage was identified via airborne optical and thermal IR imagery and ground-observer reports, with the airborne IR imagery also used to derive estimates of fire radiative energy, thus allowing the relative amount of fuel burned in each stage to be calculated and the "fire averaged" emission ratios and emission factors to be determined. The derived "fire averaged" emission ratios are dominated by the headfire contribution, since

  3. Creación de una empresa de recogida selectiva y gestión de aceite vegetal usado

    OpenAIRE

    Iribarren García, Iñigo

    2010-01-01

    Este proyecto trata sobre la creación de una empresa donde todo va a girar en torno a un producto principal: el aceite vegetal usado. A partir de ahí, en la empresa aparecen cuatro líneas de negocio independientes y a la vez relacionadas, que directa o indirectamente están ligadas con el aceite usado. Las cuatro líneas de trabajo van a ser una parte referente al servicio de recogida del aceite, actuación de la cual derivan otras dos de las cuatro líneas de negocio, como son la venta del aceit...

  4. Influencia de las concentraciones de aceite y emulsionante en las propiedades reológicas de emulsiones aceite en agua del tipo salsa fina

    Directory of Open Access Journals (Sweden)

    Franco, José María

    1995-04-01

    Full Text Available The viscous and viscoelastic behaviour of food emulsions containing a mixture of egg yolk and sucrose stearate as a function of oil and sucrose stearate concentrations were studied. Oil concentrations ranged between 40- 55% w/w for emulsions containing 5% w/w sucrose stearate and sucrose ester concentrations varied between 0-10% w/w for emulsions containing 50% w/w oil. steady flow, linear oscillatory shear tests and droplet size distribution measurements were carried out. An increase in oil or emulsifier concentration produced an increase in both the steady-state viscosity and in the viscoelastic functions. The results have been explained on the basis of the relationship between the structural parameters and the rheology of the emulsions studied.

    Se ha estudiado la influencia que ejercen las concentraciones de aceite y emulsionante sobre el comportamiento viscoso y viscoelástico de emulsiones alimentarias con bajo contenido en aceite estabilizadas por una mezcla de yema de huevo y estearato de sacarosa. Se han preparado emulsiones variando la concentración de aceite entre el 40 y el 55% p/p en emulsiones con un 5% p/p en sucroéster y la concentración de sucroéster entre el 0 y el 10% p/p manteniendo un 50% p/p en aceite. Se han realizado medidas reológicas en cizalla oscilatoria dentro del intervalo de viscoelasticidad lineal, representativas de un estado imperturbado, y medidas en cizalla estacionaria, que causan una gran destrucción estructural. También se han determinado las distribuciones de tamaños de gota. Un aumento en el contenido de aceite o emulsionante produce un aumento de las funciones viscoelásticas dinámicas y de la viscosidad estacionaria. Estos resultados se explican en función de los parámetros estructurales de las emulsiones.

  5. EXTRACCIÓN DEL ACEITE DE LA SEMILLA DE PATILLA (Citrullus vulgaris POR LIXIVIACIÓN

    Directory of Open Access Journals (Sweden)

    Peggy Londoño

    2014-01-01

    Full Text Available L a extracción del aceite de la semilla de patilla c onsistió inicialmente en un estudio fisicoquímico de la semilla , con la finalidad de conocer su contenido nutricional mediante la realización de diferentes análisis como humedad, cenizas, grasas, fósforo, proteínas y carbohidratos . Posteriormente se procedió con la extracción del aceite utilizando el equipo de extracci ón sólido - líquido S oxhlet, empleando hexano como solvente mediante el diseño factorial del t ipo 2 3 . Luego de esto se realizó la caracterización del aceite crudo y ref inado siguiendo la metodologí a descrita por las normas COVENI N , donde el aceite presentó propiedades que le confieren gran potencial en la industria cosmética en la elaboración de ja bones. Por último se hizo un perfil lipídico por medio de una cromatografía de gases , arrojando un alto contenido de ácidos grasos insaturados (linoléico y oleíco que le dan la potencialidad de ser aplicado como un aceite apto para consumo humano de excelentes propiedades y calidad.

  6. Influencia del tratamiento enzimático en la calidad de aceites vegetales

    Directory of Open Access Journals (Sweden)

    Sineiro, J.

    1998-04-01

    Full Text Available In this paper the effects of the enzymatic treatment on the quality and composition of vegetable edible oils are revised. Stability and refinability related aspects of oils from seeds, olive and other fruits are presented, so as an organoleptic valoration of the olive oil. Oils from enzyme aided processes show composition and characteristics similar to the ones from oils obtained from raw materials.

    En este estudio se revisan los efectos del tratamiento enzimático, aplicado con el fin de mejorar la extractabilidad del aceite, sobre la calidad y pureza de aceites comestibles extraídos de vegetales. Se presentan aspectos relativos a la estabilidad y refinabilidad de aceites de semillas y de aceite de oliva y otros frutos, así como la valoración organoléptica de este último. Los aceites obtenidos por aplicación de tecnología enzimática muestran composición y características similares a los obtenidos de materiales sin tratar.

  7. Combining mechanical-biological residual waste treatment plants with the carbonisation-combustion process; Kombination MBA mit dem Schwel-Brenn-Verfahren

    Energy Technology Data Exchange (ETDEWEB)

    Diekmann, J.; Wiehn, G. [Siemens AG Unternehmensbereich KWU, Erlangen (Germany). Bereich Energieerzeugung

    1998-09-01

    The disposal market for household waste is strongly influenced by the legal framework governing it. A further factor that makes it difficult for the authorities responsible for disposal to decide on residual waste disposal by means of thermal or mechanical-biological treatment plants is the downward pressure on disposal prices from inexpensive, underused landfills. This makes it all the more important for a future-oriented waste management to develop a both economically and ecologically optimised waste disposal concept. In this situation there is much in favour of adopting a concept consisting of a combination of mechanical, mechanical-biological, and thermal treatment which takes due account of waste disposal concepts at the regional and supraregional scale. [Deutsch] Der Entsorgungsmarkt fuer Siedlungsabfaelle wird stark durch die Entwicklung der rechtlichen Rahmenbedingungen beeinflusst. Hinzu kommt, dass der Entscheidungsprozess der oeffentlichen Entsorgungstraeger zur Restabfallentsorgung mittels thermischer oder mechanisch-biologischer Anlagen durch den Druck auf die Entsorgungspreise aufgrund der kostenguenstigen, nicht ausgelasteten Deponien erschwert wird. Umso mehr muss das Ziel einer zukunftsorientierten Abfallwirtschaft sein, unter oekonomischen und oekologischen Gesichtspunkten ein optimiertes Abfallkonzept aufzubauen. Hier kann es sehr hilfreich sein, sich eines Konzeptes, bestehend aus der Kombination von mechanischer, mechanisch-biologischer und thermischer Behandlung unter Beruecksichtigung des regionalen und ueberregionalen Abfallkonzeptes zu bedienen. (orig./SR)

  8. Evaluation of laboratory and industrial meat and bone meal combustion residue as cadmium immobilizing material for remediation of polluted aqueous solutions: 'Chemical and ecotoxicological studies'

    Energy Technology Data Exchange (ETDEWEB)

    Coutand, M., E-mail: marie.coutand@iut-tlse3.fr [Universite de Toulouse (France); UPS, INSA (France); LMDC - Laboratoire Materiaux et Durabilite des Constructions, 135, avenue de Rangueil, F-31 077 Toulouse Cedex 04 (France); Deydier, E., E-mail: eric.deydier@iut-tlse3.fr [Universite de Toulouse, Laboratoire de Chimie de Coordination du CNRS (UPR 8241), lie par convention a l' Universite Paul Sabatier - IUT A, Avenue Georges Pompidou, BP258, 81104 Castres (France); Cyr, M. [Universite de Toulouse (France); UPS, INSA (France); LMDC - Laboratoire Materiaux et Durabilite des Constructions, 135, avenue de Rangueil, F-31 077 Toulouse Cedex 04 (France); and others

    2009-07-30

    Meat and Bone Meals (MBM) combustion residues (ashes) are calcium and phosphate-rich materials. The aim of this work is to evaluate ashes efficiency for remediation of cadmium-contaminated aqueous solutions, and to assess the bioavailability of cadmium on Xenopuslaevis larvae. In this study both industrial (MBM-BA) and laboratory (MBM-LA) ashes are compared regarding their efficiency. Kinetic investigations reveal that cadmium ions are quickly immobilized, with a maximum cadmium uptake at 57 mg Cd{sup 2+}/g of ashes for MBM-LA, two times higher than metal uptake quantity of MBM-BA, in our experimental conditions. Chemical and X-ray diffraction analysis (XRD) reveal that Cd{sup 2+} is mainly immobilized as Ca{sub 10-x}Cd{sub x}(PO{sub 4}){sub 6}(OH){sub 2} by both ashes, whereas otavite, Cd(CO{sub 3}), is also involved for MBM-LA in cadmium uptake. Otavite formation could be explained by the presence of carbonates in MBM-LA, as observed by IR. Genotoxicity of cadmium solution on Xenopus larvae is observed at 0.02, 0.2 and 2 mg Cd{sup 2+}/L. However addition of only 0.1 g/L MBM-LA inhibits these effects for the above concentration values whereas Cd{sup 2+} bioaccumulation in larvae's liver is similar for both experiments, with and without ashes.

  9. Trace gas emissions from combustion of peat, crop residue, biofuels, grasses, and other fuels: configuration and FTIR component of the fourth Fire Lab at Missoula Experiment (FLAME-4

    Directory of Open Access Journals (Sweden)

    C. E. Stockwell

    2014-04-01

    Full Text Available During the fourth Fire Lab at Missoula Experiment (FLAME-4, October–November~2012 a~large variety of regionally and globally significant biomass fuels was burned at the US Forest Service Fire Sciences Laboratory in Missoula, Montana. The particle emissions were characterized by an extensive suite of instrumentation that measured aerosol chemistry, size distribution, optical properties, and cloud-nucleating properties. The trace gas measurements included high resolution mass spectrometry, one- and two-dimensional gas chromatography, and open-path Fourier transform infrared (OP-FTIR spectroscopy. This paper summarizes the overall experimental design for FLAME-4 including the fuel properties, the nature of the burn simulations, the instrumentation employed, and then focuses on the OP-FTIR results. The OP-FTIR was used to measure the initial emissions of 20 trace gases: CO2, CO, CH4, C2H2, C2H4, C3H6, HCHO, HCOOH, CH3OH, CH3COOH, glycolaldehyde, furan, H2O, NO, NO2, HONO, NH3, HCN, HCl, and SO2. These species include most of the major trace gases emitted by biomass burning and for several of these compounds it is the first time their emissions are reported for important fuel types. The main fuel types included: African grasses, Asian rice straw, cooking fires (open (3-stone, rocket, and gasifier stoves, Indonesian and extratropical peat, temperate and boreal coniferous canopy fuels, US crop residue, shredded tires, and trash. Comparisons of the OP-FTIR emission factors (EF and emission ratios (ER to field measurements of biomass burning verify that the large body of FLAME-4 results can be used to enhance the understanding of global biomass burning and its representation in atmospheric chemistry models.

  10. Applied combustion

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1993-12-31

    From the title, the reader is led to expect a broad practical treatise on combustion and combustion devices. Remarkably, for a book of modest dimension, the author is able to deliver. The text is organized into 12 Chapters, broadly treating three major areas: combustion fundamentals -- introduction (Ch. 1), thermodynamics (Ch. 2), fluid mechanics (Ch. 7), and kinetics (Ch. 8); fuels -- coal, municipal solid waste, and other solid fuels (Ch. 4), liquid (Ch. 5) and gaseous (Ch. 6) fuels; and combustion devices -- fuel cells (Ch. 3), boilers (Ch. 4), Otto (Ch. 10), diesel (Ch. 11), and Wankel (Ch. 10) engines and gas turbines (Ch. 12). Although each topic could warrant a complete text on its own, the author addresses each of these major themes with reasonable thoroughness. Also, the book is well documented with a bibliography, references, a good index, and many helpful tables and appendices. In short, Applied Combustion does admirably fulfill the author`s goal for a wide engineering science introduction to the general subject of combustion.

  11. Biorremediación de lodos contaminados con aceites lubricantes usados

    Directory of Open Access Journals (Sweden)

    María Cristina Vásquez

    2010-06-01

    ón, biopilas, aceites usados, hidrocarburos totales del petróleo, microorganismos nativos. ABSTRACT: The sludge contaminated with residues of used lubricating oils produce large negative environmental impact by not being handled properly. We proposed Biorremediation to decreasethe concentration of these polltants. The trials were conducted on the waste water treatment plant (WWTP Río Frío (Girón, Santander, Colombia ,we evaluate native microbial associations, and subsequently they were added to biopiles, made up of dried sludge the waste water treatment (source of organic mater sludge from washing cars and sewage sludge from the industrial area of the city Bucaramanga (Colombia. Several pilot test were completed and we isolated, identified and retained microbial atrains with ability to degrading total petroleum hydrocarbons (TPH such as Pseudomonas spp., Escherichia coli, Citrobacter spp., Bacillus brevis, Micrococcus spp., among others. We inoculated each pilot assembly with a bacterial concentration of 3x108 UFC/ml and fungal microorganisms like Aspergillus spp., Fusarium spp., Trichoderma spp. in a concentration of 1x106 Spores/ml. Parameters such as temperature, pH, humidity, oxygenation were monitoring frequently. Two trials were completed to verify the behabior and results of treatment, we analized continuously the concentration of TPH using linear mixed models approach in a randomized complete blocks, which revealed significant differences between control biopile (without microorganism consortia and biopiles under test, obtaining removal percentages to 94% of TPH in 120 days, and 84% in 40 days, reflecting a positive effect on the use of consortia of microorganisms under test in the decontamination of domestic sewage sludge and industrial sludge and sludge the car wash. Key words: Bioremediation, biopiles, used lubricating oils, Total Petroleum Hydrocarbons, native microorganisms

  12. Índices de oxidación en aceites de algunas leguminosas del desierto sonorense

    Directory of Open Access Journals (Sweden)

    Vázquez-Moreno, L.

    2001-02-01

    Full Text Available The oxidation process of crude and refined oils from wild leguminous seeds: Prosopis juliflora (mezquite, Mimosa grahamii (gatuña, Acacia constricta, (vinorama Olneya tesota, (palo fierro Cercidium praecox (palo de brea and Parkinsonia aculeata (palo verde were evaluated during storage for 122 days, using corn and soybean oils as controls. Peroxide, Iodine, Acid and p-Anisidine values were determinated during 122 days of storage at room temperature. The wild leguminous raw oils showed results similar to those for the corn raw oil and lower than those of soybean raw oil. This behavior was similar for refinated oils. The rancid odor was detected after 5 days of storage in soybean oil and 40 days in vinorama oil, on the contrary, mezquite, palo verde and palo of brea oils presented this odor after 62 days, and for gatuña’s oil needed 135 days. Our results indicate that legume seed of Sonoran Desert could be a good alternative as source of oil.El proceso de oxidación fue evaluado durante el almacenamiento de los aceites crudos y refinados de las semillas de leguminosas silvestres: Prosopis juliflora (mezquite, Mimosa grahamii (gatuña, Acacia constricta (vinorama, Olneya tesota (palo fierro, Cercidium praecox (palo de brea y Parkinsonia aculeata (palo verde. Los aceites de maíz y soja fueron empleados como controles. Se determinó el índice de peróxido (I.P., de Yodo (I.I., de acidez (I.A, y valor de p-Anisidina (p-A durante 122 días de almacenamiento a temperatura ambiente. Los aceites crudos de leguminosas silvestres mostraron valores de estos índices similares a los del aceite de maíz crudo y menores que los del aceite de soja crudo. Este comportamiento también fue observado para los aceites refinados. El olor a rancio se presentó en el aceite de soja a los 5 días de almacenamiento, en el de vinorama a los 40 días, en el de mezquite, palo verde y palo de brea a los 62 días y en el de gatuña a los 135 días. Los valores

  13. Gestión sostenible de los residuos de la construcción. Aceites usados

    OpenAIRE

    Berhamovic Breko, Kemal

    2015-01-01

    El principal objetivo de este trabajo es calcular el impacto ambiental generado por los aceites minerales usados en una obra y proponer medidas para su reducción. Para la elaboración del mismo se plantearon cuatro objetivos específicos: 1) identificar un listado completo de los residuos peligrosos que intervienen en la fase constructiva de una obra; 2) presentar toda la legislación que afecta a estos residuos; 3) calcular el impacto ambiental de los aceites residuales producido...

  14. Derivados de tomate y aceite de oliva virgen extra: calidad, compuestos bioactivos y alegaciones de salud

    OpenAIRE

    Fernández Redondo, Delia

    2016-01-01

    Dada la importancia del tomate y del aceite de oliva en la dieta mediterránea por su composición nutricional, por los efectos beneficiosos sobre la salud humana y por su repercusión económica en nuestro país, esta Tesis Doctoral que lleva por título Derivados de tomate y aceite de oliva virgen extra. Calidad, compuestos bioactivos y alegaciones de salud, plantea los siguientes objetivos: evaluación del contenido de licopeno en derivados de tomate y de compuestos fenólicos y parámetros de cali...

  15. Purificación de biodiesel obtenido de aceite de ricinus

    OpenAIRE

    T. del N. J. García-Cota; V. M. de la Cruz-Gonzalez; I. Nájera-Martínez; O. Sanchez-Daza; Y. Reyes-Ortega; T. López-Arenas

    2009-01-01

    El aceite de ricino representa una materia prima viable para la producción de biodiesel. Sin embargo, la presencia de un grupo hidroxilo en la estructura del ácido ricinoleico provee de características especiales al aceite de ricino y a sus derivados. Debido a esto no hay una separación de fases biodiesel-glicerina formadas durante la reacción de transesterificación. El presente trabajo se enfocó en la generación de una metodología experimental para resolver tal problema de purificación. Res...

  16. OBTENCIÓN DE FRACCIONES ENRIQUECIDAS DURANTE LA EXTRACCIÓN DE ACEITES ESENCIALES CRUDOS

    OpenAIRE

    María S Guala; Gustavo A. Pérez; Lorena P. Barducco; Alejandro R. Marsó; Heriberto V Elder

    2012-01-01

    La destilación por arrastre con vapor es uno de los métodos más utilizados para la obtención de aceite esencial crudo (AEC). Muchas aplicaciones requieren fracciones de AEC, enriquecidas en un componente o grupo de ellos, para lo cual se utiliza destilación al vacío. En este trabajo se propone realizar un fraccionamiento del aceite esencial crudo (AEC) durante el proceso de extracción por destilación con arrastre de vapor, para lo cual se colectaron distintos cortes, en lugar de una única mez...

  17. Diseño de un proceso de fraccionamiento de aceites de fusel

    OpenAIRE

    Navarrete González, Irene

    2004-01-01

    El proceso que se diseña en el presente proyecto tiene como finalidad la obtención de tres fracciones alcohólicas para su aplicación en la industria alimentaria a través de un proceso de destilación discontinua o batch, partiendo de una determinada mezcla de aceites de fusel. El proceso se diseña con capacidad para destilar anualmente 50.000 litros de aceites de fusel por cargas.

  18. Actividad antimicrobiana de aceite esencial de Origanum vulgare L. ante bacterias aisladas en leche de bovino

    OpenAIRE

    Oyarzabal, Marta Elaine Bastos; Schuch, Luiz Filipe Damé; Prestes,Luciana de Souza; Schiavon,Diane Bender Almeida; Rodrigues,Maria Regina Alves; Mello, Joao Roberto Braga de

    2011-01-01

    Introducción: la mastitis bovina es el mayor problema en la producción lechera, causada principalmente por bacterias grampositivas. La búsqueda de principios activos que actúen en esos microrganismos es creciente, sobre todo por la ocurrencia de multirresistencia bacteriana. Objetivos: evaluar la concentración bactericida mínima del aceite esencial de Origanum vulgare L. (orégano) frente a bacterias aisladas de leche mastítica. Métodos: se evaluó la actividad antimicrobiana del aceite esencia...

  19. Ingesta y evolución ponderal de ratas alimentadas con diferentes aceites crudos y fritos

    Directory of Open Access Journals (Sweden)

    Pérez-Granados, A. M.

    1998-04-01

    Full Text Available Olive oil, sunflower oil and palm olein, unused or used in repeated potato frying until the oils reached the limit of 25% of polar compounds (PC were used. Wistar rats were fed over 28 days diets containing 8% of: olive oil, olive oil from 48 fryings, olive oil from 69 fryings (25% PC, sunflower oil, sunflower oil from 48 fryings (25% PC, palm olein and palm olein from 80 fryings (25% PC Body weight and food intake were monitored weekly and food efficiency was calculated. At the end of the experiment the animals were sacrificed to separate the liver and calculate the hepatosomatic index. The consumption of frying oils did not modify food Intake, body weight food efficiency nor liver weight but hepatosomatic index was higher in rats consuming frying palm olein compared to unused palm olein.

    Se utilizaron aceites de oliva, girasol y oleína de palma, crudos o procedentes de frituras repetidas de patatas sin reposición de aceite hasta alcanzar el límite del 25% de compuestos polares (CP. Ratas Wistar se alimentaron durante 28 días con dietas que contenían un 8% de: aceite de oliva, aceite de oliva de 48 frituras, aceite de oliva de 69 frituras (25% CP, aceite de girasol, aceite de girasol de 48 frituras (25% CP, oleína de palma y oleína de palma de 80 frituras (25% CP. Peso e ingesta se controlaron semanalmente y se calculó el coeficiente de eficacia alimentaria. Al final del experimento los animales se sacrificaron para extraer los hígados y determinar el índice hepatosomático. El consumo de los aceites empleados en fritura no modificó la ingesta, peso, coeficiente de eficacia alimentaria ni el peso de los hígados, observándose únicamente un incremento del índice hepatosomático en los animales que ingirieron la oleína de palma frita frente a la cruda.

  20. Caracterización de las aguas residuales de la planta refinadora de aceites comestibles ERASOL

    Directory of Open Access Journals (Sweden)

    Arelis Abalos

    2007-01-01

    regulaciones de la Norma Cubana para el vertido en cuerpos receptores marinos. Los análisis demostraron que la bahía recibe la descarga de aguas residuales de ERASOL con un pH de 9,7 unidades, 40232,50 mg/L de materia orgánica, 18537,13 g/L de aceites y 0,2 mL/L de sólidos sedimentables. Estos resultados evidenciaron que las aguas residuales de la planta de aceites ERASOL no cumplen con las especificaciones de la norma de vertido en cuerpos marinos.

  1. EXTRACCIÓN DEL ACEITE DE LA SEMILLA DE PATILLA (Citrullus vulgaris) POR LIXIVIACIÓN

    OpenAIRE

    2014-01-01

    L a extracción del aceite de la semilla de patilla c onsistió inicialmente en un estudio fisicoquímico de la semilla , con la finalidad de conocer su contenido nutricional mediante la realización de diferentes análisis como humedad, cenizas, grasas, fósforo, proteínas y carbohidratos . Posteriormente se procedió con la extracción del aceite utilizando el equipo de extracci ón sólido - líquido S oxhlet, empleando hexano como solvente mediante el diseño factorial del t ipo 2 3 . Luego de esto s...

  2. Análisis Químico de Mezclas Biodiesel de Aceite de Cocina Usado y Diesel por Espectroscopia Infrarroja Chemical Analysis of Mixtures of Biodiesel from Used Cooking Oil and Diesel by Infrared Spectroscopy

    Directory of Open Access Journals (Sweden)

    Jennifer J Lafont

    2011-01-01

    Full Text Available Se propone un método eficiente para determinar los porcentajes óptimos de mezclas biodiesel de aceite usado y diesel, para uso automotor. El procedimiento consiste en recolección del aceite usado, limpieza de residuos, y obtención del biodiesel mediante una reacción de transesterificación, con diferentes proporciones molares metanol/aceite . Las muestras fueron analizadas por espectroscopia infrarroja. Se encontró que una proporción metanol/aceite de 1:8 presentó mayor rendimiento en la obtención de biodiesel. Los espectros de infrarrojo mostraron el incremento del máximo de carbonilo de los esteres metílicos al aumentar las concentraciones de biodiesel en las mezcla biodiesel+diesel. Se concluye que la técnica usada cumple con la ley de Beer-Lambert y es adecuada para cuantificar este tipo de mezclas.An efficient method to determine the optimum percentages of blends biodiesel from used oil and diesel for automotive use, is proposed. The procedure consists of recollection of used frying oil, residue cleaning and synthesis of biodiesel by a transesterification reaction with different molar proportions of methanol/oil. The samples were analyzed by infrared spectroscopy. It was found that a ratio methanol/oil of 1:8 showed higher performance in the production of biodiesel. The infrared spectra showed an increase in the carbonyl peak of the methyl esters with the increase of the concentration of biodiesel in the mixtures biodiesel+diesel. It is concluded that proposed technique complies with the Beer-Lambert law and it is a good method to quantify these types of mixtures.

  3. Influencia de dos aceites ricos en ácido oleico sobre el transporte e incorporación tisular de los trigliceridos

    OpenAIRE

    Perona, Javier S.

    2001-01-01

    Existe una sobrada evidencia de que la denominada Dieta Mediterránea está asociada con una disminución de la incidencia de enfermedades cardiovasculares. Este efecto ha sido tradicionalmente atribuido al acido oleico, procedente del aceite de oliva. Sin embargo, el aceite d ... e oliva virgen, pero no otro aceite muy rico en acido oleico, como es el aceite de girasol alto-oleico, reduce la presión arterial en sujetos sanos y pacientes hipertensos. Entre estos dos aceites destacan las diferenc...

  4. Field determination of biomass burning emission ratios and factors via open-path FTIR spectroscopy and fire radiative power assessment: headfire, backfire and residual smouldering combustion in African savannahs

    Directory of Open Access Journals (Sweden)

    M. J. Wooster

    2011-11-01

    Full Text Available Biomass burning emissions factors are vital to quantifying trace gas release from vegetation fires. Here we evaluate emissions factors for a series of savannah fires in Kruger National Park (KNP, South Africa using ground-based open path Fourier transform infrared (FTIR spectroscopy and an IR source separated by 150–250 m distance. Molecular abundances along the extended open path are retrieved using a spectral forward model coupled to a non-linear least squares fitting approach. We demonstrate derivation of trace gas column amounts for horizontal paths transecting the width of the advected plume, and find for example that CO mixing ratio changes of ~0.01 μmol mol−1 [10 ppbv] can be detected across the relatively long optical paths used here. Though FTIR spectroscopy can detect dozens of different chemical species present in vegetation fire smoke, we focus our analysis on five key combustion products released preferentially during the pyrolysis (CH2O, flaming (CO2 and smoldering (CO, CH4, NH3 processes. We demonstrate that well constrained emissions ratios for these gases to both CO2 and CO can be derived for the backfire, headfire and residual smouldering combustion (RSC stages of these savannah fires, from which stage-specific emission factors can then be calculated. Headfires and backfires often show similar emission ratios and emission factors, but those of the RSC stage can differ substantially. The timing of each fire stage was identified via airborne optical and thermal IR imagery and ground-observer reports, with the airborne IR imagery also used to derive estimates of fire radiative energy (FRE, allowing the relative amount of fuel burned in each stage to be calculated and "fire averaged" emission ratios and emission factors to be determined. These "fire averaged" metrics are dominated by the headfire contribution, since the FRE data indicate that the vast majority

  5. Field determination of biomass burning emission ratios and factors via open-path FTIR spectroscopy and fire radiative power assessment: headfire, backfire and residual smouldering combustion in African savannahs

    Science.gov (United States)

    Wooster, M. J.; Freeborn, P. H.; Archibald, S.; Oppenheimer, C.; Roberts, G. J.; Smith, T. E. L.; Govender, N.; Burton, M.; Palumbo, I.

    2011-11-01

    Biomass burning emissions factors are vital to quantifying trace gas release from vegetation fires. Here we evaluate emissions factors for a series of savannah fires in Kruger National Park (KNP), South Africa using ground-based open path Fourier transform infrared (FTIR) spectroscopy and an IR source separated by 150-250 m distance. Molecular abundances along the extended open path are retrieved using a spectral forward model coupled to a non-linear least squares fitting approach. We demonstrate derivation of trace gas column amounts for horizontal paths transecting the width of the advected plume, and find for example that CO mixing ratio changes of ~0.01 μmol mol-1 [10 ppbv] can be detected across the relatively long optical paths used here. Though FTIR spectroscopy can detect dozens of different chemical species present in vegetation fire smoke, we focus our analysis on five key combustion products released preferentially during the pyrolysis (CH2O), flaming (CO2) and smoldering (CO, CH4, NH3) processes. We demonstrate that well constrained emissions ratios for these gases to both CO2 and CO can be derived for the backfire, headfire and residual smouldering combustion (RSC) stages of these savannah fires, from which stage-specific emission factors can then be calculated. Headfires and backfires often show similar emission ratios and emission factors, but those of the RSC stage can differ substantially. The timing of each fire stage was identified via airborne optical and thermal IR imagery and ground-observer reports, with the airborne IR imagery also used to derive estimates of fire radiative energy (FRE), allowing the relative amount of fuel burned in each stage to be calculated and "fire averaged" emission ratios and emission factors to be determined. These "fire averaged" metrics are dominated by the headfire contribution, since the FRE data indicate that the vast majority of the fuel is burned in this stage. Our fire averaged emission ratios and factors

  6. Efectos secundarios de la aplicación tópica de un aceite de esencial: dermatitis alérgica de contacto a aceite de árbol de té

    Directory of Open Access Journals (Sweden)

    R. Santesteban Muruzábal

    2015-04-01

    Full Text Available Fundamento. El aceite de árbol de té es un aceite esencial, cuyo uso está aumentando en nuestro medio, tanto por sus supuestos efectos medicinales, como por sus propiedades aromáticas. Se describe nuestra experiencia en dermatitis alérgica de contacto tras la aplicación de este aceite. Material y Métodos. Cinco pacientes en los últimos 5 años (0,4% de todos los pacientes estudiados en consulta especializada reaccionaron a una concentración de 5% de aceite de árbol de té en vaselina. Resultados. Todos los pacientes presentaron reacciones fuertes, y en todos los casos éstas fueron consideradas relevantes. Tres de ellos reaccionaron también a d-limoneno oxidado, uno de los componentes del aceite de árbol de té, que está presente en nuestra serie estándar. Conclusiones. Se han descrito diversos casos en la literatura de dermatitis alérgica de contacto al aceite de árbol de té, pero hasta hace poco ha sido infrecuente en nuestro medio. Con el aumento de popularidad de terapias alternativas y naturales hemos sido testigos de varios casos de sensibilización a este aceite esencial, que había sido utilizado para tratar varias enfermedades de la piel supuestamente "infecciosas", pero que eran muy probablemente diferentes formas de dermatitis.

  7. La diosa de Galera, fuente de aceite perfumado

    Directory of Open Access Journals (Sweden)

    Almagro-Gorbea, Martín

    2009-12-01

    Full Text Available The Goddess from Galera was found in a tomb of the Iberian cemetery of Tutugi (Granada dated c. 450 BC with a structure similar to the royal tomb of Pozo Moro. The Galera-Goddess is an alabaster sculpture dated in the VIII BC. from a Syrio-Phoenician workshop. It was a sacred vase for perfumed oil, devoted to the ritual anoint of god sculptures and sacred kings. The vase represents the goddess Astart, seated in her throne between two sphinxes and conceived as the Tree of Life. From her breasts come out the sacred perfumed oil which give life to the King, protect him magically and give him the Everlasting Life, as shown in oriental texts and iconography. Thereafter, it was not a keimélion brought trough Phoenicians trade, but a sacred object arrived to the Far West from a Nord-Syrian royal context trough the koiné of the Phoenician colonisation. As it was found in an Iberian royal tomb, it documents the origin of the ideology and ritual from the Tartessian and Iberian kings in the Orientalaizing Period.La llamada Diosa de Galera apareció en una tumba real de la necrópolis ibérica de Tutugi (Granada, comparable a la de Pozo Moro, aunque de mediados del siglo V a.C. Es una escultura de alabastro labrada en un taller áulico sirio-fenicio del siglo VIII a.C. para servir como vaso sagrado de aceite perfumado destinado en exclusiva a la unción ritual de estatuas de divinidad y/o de reyes divinizados. La diosa Astart, entronizada entre dos esfinges, aparece concebida como Árbol de la Vida, pues de sus pechos brota el divino néctar o ambrosía perfumado que da al Rey la vida, le protege mágicamente y le garantiza la vida eterna en el Más Allá, según indican textos y representaciones orientales. Se trata de un objeto ritual sacro de ámbito regio, no de un simple keimélion traído por los fenicios. Sería la divinidad protectora de algún miembro de estirpe real nordsirio llegado a Occidente a través de la koiné colonial fenicia. Su

  8. Preliminary study of Lead (Pb) immobilization by meat and bone meal combustion residues (MBMCR) in soil: assessment of Pb toxicity (phytotoxicity and genotoxicity) using the tobacco model (Nicotiana tabacum var. xanthi Dulieu).

    Science.gov (United States)

    Mouchet, F; Cren, S; Deydier, E; Guilet, R; Gauthier, L

    2008-08-01

    Lead (Pb) is a major chemical pollutant in the environment. The present investigation evaluates the possible use of Meat and Bone Meal Combustion Residues (MBMCR), to sequester Pb from the soil compartment using the heterozygous tobacco model (Nicotiana tabacum var. xanthi Dulieu) characterized by the a1+ /a1 a2+ /a2 system. The toxic potential of Pb-contaminations (50, 100, 1,000, 2,000 and 10,000 mg Pb kg(-1)) as Pb(NO3) in standard soil was investigated in lab conditions according to three endpoints: (i) acute toxicity of plants (mortality, height and surface area parameters), (ii) Pb-accumulation in roots, stems and leaves, and (iii) genetic effects as the expression of reversion in the leaf of plants. Moreover, chemical investigations of Pb interactions with soil were realized to complete the toxicity evaluation. The results demonstrated that: (i) MBMCR were not acutely toxic or genotoxic to tobacco plants, (ii) Pb is acutely toxic to tobacco plants at 10,000 mg Pb kg(-1) of soil, (ii) but is not genotoxic, and (iii) Pb-bioaccumulation is significant in leaves, stems and roots (from 1,000, 2,000, and 50 mg Pb kg(-1) of soil, respectively). In contrast, in the presence of MBMCR, the toxic impacts of Pb were inhibited and Pb-accumulation in tobacco plants was reduced. In complement, chemical analyses highlighted the high capacity of the standard soil to immobilize Pb. The results suggest that even if Pb is bioavailable from soils to plants, complex mechanisms could occur in plants protecting them from the toxic impact of Pb.

  9. Biofuels combustion.

    Science.gov (United States)

    Westbrook, Charles K

    2013-01-01

    This review describes major features of current research in renewable fuels derived from plants and from fatty acids. Recent and ongoing fundamental studies of biofuel molecular structure, oxidation reactions, and biofuel chemical properties are reviewed, in addition to combustion applications of biofuels in the major types of engines in which biofuels are used. Biofuels and their combustion are compared with combustion features of conventional petroleum-based fuels. Two main classes of biofuels are described, those consisting of small, primarily alcohol, fuels (particularly ethanol, n-butanol, and iso-pentanol) that are used primarily to replace or supplement gasoline and those derived from fatty acids and used primarily to replace or supplement conventional diesel fuels. Research efforts on so-called second- and third-generation biofuels are discussed briefly.

  10. Caracterización y perfil lipídico de aceites de microalgas

    Directory of Open Access Journals (Sweden)

    Lesly Tejeda-Benítez

    2015-05-01

    Full Text Available El uso creciente del biodiésel ha impulsado la búsqueda de nuevas materias primas, dentro de las que se destacan las microalgas. En esta investigación se estudió el cultivo de las microalgas Chlorella sp. y Dunaliella salina bajo diferentes condiciones de pH y concentración de nitrógeno (mgL-1, y la caracterización de los aceites obtenidos, con el fin de evaluar su potencial uso como materia prima en la producción de biodiésel. La D. salina alcanzó una máxima concentración celular de 1.15x106 células mL-1 en 6 días de cultivo en unas condiciones de 8.5 pH y 0.1 mg L-1 concentración de nitrógeno, mientras que Chlorella sp. presentó una máxima concentración celular de 2.6x107 células mL-1 en 14 días de cultivo en unas condiciones de 7.5 pH y 0.1 mg L-1 concentración de nitrógeno. La extracción de aceite intracelular de las microalgas cultivadas bajo las mejores condiciones de crecimiento celular se realizó empleando el método modificado de Bligh & Dyer. Al determinar el perfil de ácidos grasos de los aceites extraídos de ambas microalgas, se  encontraron en mayor proporción dos ácidos grasos insaturados: ácido linolénico y ácido oleico. En el aceite de D. salina se encontró una concentración de 51% p/p de ácido linolénico, mientras que para el aceite de Chlorella sp. fue de 39% p/p. Con relación al ácido oleico, el aceite de Chrorella sp. presentó una concentración de 35% p/p, superior al aceite de D. salina, con 25% p/p.

  11. Oportunidades comerciales para el aceite de oliva de Castilla-La Mancha

    Directory of Open Access Journals (Sweden)

    Olivas, Raquel

    2009-12-01

    Full Text Available Quality olive oils produced in Castilla-La Mancha are difficult to commercialize in the national and international markets due to increasing competition among olive oil companies and their easy replacement by other cheaper seed oils. To increase competitiveness, consumer preference must be discovered. Therefore, 420 surveys were made on vegetable oil consumers in the Madrid metropolitan area in December, 2006. It was detected by means of the conjoint analysis technique, simulation and analysis logit that the type of vegetable oil preferred by consumers was the extra virgin olive oil. Some market opportunities seem to exist for the organic olive oil produced in Castilla-La Mancha and consumers’ maximum willingness to pay for organic olive oil with regard to the conventional oil is 13.1%. In addition to this, and with the aim of contributing to the commercialization of the organic olive oil produced in Castilla-La Mancha, the Regional Government of Castilla-La Mancha (Spain could promote the creation of the Protected Geographical Indication of Castilla-La Mancha Organic Olive Oils.El aceite de oliva producido en Castilla-La Mancha tiene una difícil comercialización tanto por el aumento de la competitividad nacional como internacional así como por su fácil sustitución por otros aceites de semillas más baratos. Para incrementar su competitividad, resulta necesario conocer cuáles son las preferencias de los consumidores. Para ello, se realizaron 420 encuestas en diciembre de 2006 a consumidores de aceite en el área metropolitana de Madrid. Mediante las técnicas de análisis conjunto, simulación y logia, se ha detectado que el tipo de aceite preferido por los consumidores es el de oliva virgen extra, que parecen existir oportunidades de mercado para los producidos ecológicamente en Castilla-La Mancha y que la máxima disposición al pago por un aceite de oliva ecológico, respecto a otro convencional, es del 13,1%. Adicionalmente a lo

  12. Proyecto de extracción de aceite esencial de jengibre como alternativa de exportación

    OpenAIRE

    2009-01-01

    El estudio está orientado a la determinación del método más adecuado para la obtención de aceite esencial de jengibre, y a la identificación de los componentes del aceite esencial, y su exportación al mercado internacional. En el Ecuador, el aceite esencial es considerado un producto agrícola no tradicional, aunque en los últimos años ha experimentado crecimientos en sus exportaciones, principalmente al apoyo de inversiones extranjeras, las cuales fomentan las exportaciones ecuatorianas y...

  13. EVALUACIÓN IN VITRO DE LA ACTIVIDAD ANTIBACTERIANA Y MODULADORA DE ACEITES DE MAÍZ Y SOJA

    OpenAIRE

    2014-01-01

    Los aceites fijos generalmente se extrae de las semillas, que se utilizan principalmente en productos alimenticios, por lo que parte de la dieta humana. El aceite de soja y el maíz son los más populares, tienen una alta calidad de proteína nutricional adecuado, con un contenido importante de minerales y fibra, y también redujo la cantidad de grasas saturadas. En este contexto, el objetivo fue el de evaluar la actividad antibacteriana y la modulación de estos dos aceites fijos industrializados...

  14. Turbulent combustion

    Energy Technology Data Exchange (ETDEWEB)

    Talbot, L.; Cheng, R.K. [Lawrence Berkeley Laboratory, CA (United States)

    1993-12-01

    Turbulent combustion is the dominant process in heat and power generating systems. Its most significant aspect is to enhance the burning rate and volumetric power density. Turbulent mixing, however, also influences the chemical rates and has a direct effect on the formation of pollutants, flame ignition and extinction. Therefore, research and development of modern combustion systems for power generation, waste incineration and material synthesis must rely on a fundamental understanding of the physical effect of turbulence on combustion to develop theoretical models that can be used as design tools. The overall objective of this program is to investigate, primarily experimentally, the interaction and coupling between turbulence and combustion. These processes are complex and are characterized by scalar and velocity fluctuations with time and length scales spanning several orders of magnitude. They are also influenced by the so-called {open_quotes}field{close_quotes} effects associated with the characteristics of the flow and burner geometries. The authors` approach is to gain a fundamental understanding by investigating idealized laboratory flames. Laboratory flames are amenable to detailed interrogation by laser diagnostics and their flow geometries are chosen to simplify numerical modeling and simulations and to facilitate comparison between experiments and theory.

  15. Insecticidal Activity of Peumus boldus Molina Essential Oil against Sitophilus zeamais Motschulsky Actividad Insecticida del Aceite Esencial de Peumus boldus Molina sobre Sitophilus zeamais Motschulsky

    Directory of Open Access Journals (Sweden)

    Jessica Betancur R

    2010-09-01

    Full Text Available In stored grains, the main agents diminishing production are insects, which can produce losses between 20% and 80% before harvest or under storage. The insecticidal properties of the essential oil of fresh leaves of Peumus boldus Molina against maize weevil (Sitophilus zeamais Motschulsky adults were determined under laboratory conditions. The highest mortality (100% was achieved at 4% concentration by contact with a treated glass surface. The same concentration in impregnated corn (Zea mays L. grain, resulted in 98.7% mortality. Mortality by fumigant action at 6 h was 100% with 35 µL oil in 0.15 L (air volume. Concentrations 1, 2 and 4% of essential oil produced 0% F1 adult emergence. At 10 d of residual effect, the 4% concentration reached 63.7% mortality. All treatments were repellent to adults of S. zeamais and corn grain germination was not affected by any treatment.Los principales agentes que disminuyen la producción en los granos almacenados son los insectos, antes de la cosecha y en el almacenamiento pueden causar pérdidas de 20 a 80%. Se evaluaron las propiedades insecticidas del aceite esencial de hojas frescas de Peumus boldus Molina para el control de adultos de gorgojo del maíz (Sitophilus zeamais Motschulsky en laboratorio. La mayor mortalidad (100% por contacto con una superficie de vidrio tratada se obtuvo con la concentración de 4%. Esta misma concentración produjo 98,7% de mortalidad en exposición a grano de maíz (Zea mays L. tratado. El efecto fumigante a las 6 h de exposición fue 100% con 35 µL de aceite en 0,15 L (volumen de aire. Con las concentraciones de 1, 2 y 4% de aceite esencial, el porcentaje de emergencia de la F1 fue 0%. A los 10 d de efecto residual se alcanzó 63,7% de mortalidad con la concentración de 4%. Todos los tratamientos fueron repelentes para adultos de S. zeamais y ningún tratamiento afectó la germinación de los granos.

  16. Combustión y combustibles

    Directory of Open Access Journals (Sweden)

    Virella, A.

    1961-06-01

    Full Text Available Not availableLa ponencia trata de los combustibles generalmente empleados en los hornos rotativos de cemento Portland y, especialmente, de los problemas relacionados con los carbones pobres. En cualquier caso, hay que tener un conocimiento previo del poder calorífico del combustible que se pretende emplear, siendo de considerar antes el coste por unidad de calor que el coste por unidad de peso. Se describen el secado y la molienda de los carbones, señalando la tendencia actual de efectuar ambas operaciones simultáneamente, definiendo la aptitud para la pulverización y la determinación de la finura del polvo de carbón, por los métodos clásicos y por medio del permeabilímetro. Se expone en qué medida influyen la finura del combustible, el sistema de inyección, el estado del aire primario, su poder comburente, el exceso de aire y la proporción de cenizas en la determinación de la temperatura de la llama, su poder radiante, el flujo térmico y la posibilidad de obtener un clínker bien cocido. Se propugna por el empleo conjunto de aceites combustibles y carbones pobres como solución muy apropiada en la mayoría de los casos. Por último, se menciona la posibilidad de que se formen anillos en los hornos rotativos como consecuencia del empleo de carbones de alto contenido de cenizas, indicando algunas soluciones para evitar dicha perturbación.

  17. Application of coal combustion residues to the stabilization/solidification of industrial wastes (IRIS); Desarrollo de un Proceso, a Escala Piloto de Inertizacion de Residuos Industriales con Cenizas Volantes

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1998-12-31

    Stabilization/solidification (S/S) processes, also called inertization processes, are a group of techniques which employ additives to reduce the mobility of the hazardous components from the waste and make possible for the residue to be accepted for its disposal in a safe way. These processes, mainly applied to wastes that contain heavy metals (such as lead, zinc, cadminum, mercury, copper, nickel, titanium, chromium-III, chromium-VI, arsenic,....) change the waste into a solid-like material in which the metals are trapped (nets and matrix) by physical or chemical links. The IRIS Project, carried out by AICIA through the ECSC Coal Programme with the participation of two industrial partners (Sevillana de Electricidad and EGMASA, a public-owned company for waste treatment), has developed, at pilot scale, a new S/S process for inorganic industrial wastes that uses great quantities of fly ash in the place of other more commonly used and expansive reagents. A pilot plant for 200 kg/h has been designed, built and operated. This facility has allowed to add improvements and scientific foundations to existing S/S technology. It has also allowed to obtain industrial scale parameters for fixed and portable plants. Experiencie have been mainly carried out using fly ash from high quality coals, but types of ash have been tested coming from coals with a greater calcium content, from fluidised bed combustion boilers and from desulphurisation processes, giving very suitable characteristics for their application to S/S processes. The addition of fly ash (up to 30%) in the IRIS process improves the results in comparison with the S/S processes that use only cement, because the final pH obtained (8-11) does not allow amphoteric metallic ions to escape in the leachate. The same as other S/S processes, IRIS can be applied also to wastes that contain certain metals (chromium-VI, arsenic, for example) with specific pre-treatments (redox, for example). The efficiency of the IRIS treatment

  18. Alteración termoxidativa en un aceite de girasol utilizado en 75 frituras de patatas

    Directory of Open Access Journals (Sweden)

    Cuesta, O.

    1993-10-01

    Full Text Available The alteration of a sunflower oil used in 75 repeated deep fat frying of potatoes performed with addition of unused oil every 4-5 fryings with the aim to keep constant the proportion food/oil in 500 g / 3 liters, was evaluated by column and high performance size exclusion chromatographies. The polar components increased from 5.09 ± 0.21 (unused oil to 19.11 ± 0,40 mg/100 mg oil mainly due to the formation of polymers and dimers of triacylglycerides, and to oxidized triacylglycerides. Oils, unused and from the 75 frying, were included at a rate of 15% on rat-diets. Dietary food intakes were similar, however body weight gain was a 22.3% lower in rat fed with the used oil-diet. Apparent digestibility ratios of fat and protein were similar in both groups of rats, however both. Alimentary and Protein Efficiency ratios decreased on the 75 frying oil fed rats.

    Se evalúa la alteración de un aceite de girasol utilizado en 75 frituras repetidas de patatas, efectuadas con adición de aceite sin usar cada 4-5 frituras con la finalidad de mantener constante la proporción alimento/aceite en 500 g / 3 litros, mediante cromatografías en columna y de alta eficacia por exclusión de tamaño de partícula. El contenido de los compuestos polares se incrementó de 5.09 ± 0.21 (aceite sin usar a 19.11 ± 0.40 mg/100 mg de aceite, predominando los polímeros y dímeros de triacilglicéridos y los triacilglicéridos oxidados. Dichos aceites, sin usar y utilizado en 75 frituras, se incluyeron en la proporción del 15% en las dietas del lote basal y del lote fritura 75, respectivamente. La ingesta de ambas dietas fue similar, pero la ganancia de peso resultó ser un 22,3% menor en el lote fritura 75. Los coeficientes de digestibilidad aparente de grasa y proteína fueron similares en ambos lotes, pero la utilización nutritiva en términos de coeficientes de Eficacia Alimentaria y Proteica fue menor en el lote fritura 75.

  19. Componentes funcionales en aceites de pescado y de alga Functional components in fish and algae oils

    Directory of Open Access Journals (Sweden)

    A. Conchillo

    2006-06-01

    Full Text Available Buena parte del desarrollo de nuevos alimentos funcionales está encaminada al descubrimiento o aplicación de componentes de los alimentos que favorezcan la instauración de un perfil lipídico saludable en el organismo. El objetivo del trabajo fue realizar la caracterización de la fracción lipídica de dos tipos de aceites, de pescado y de alga, para valorar su potencial utilización como ingredientes funcionales, tanto en relación con el contenido en ácidos grasos de alto peso molecular como con la presencia de esteroles y otros componentes de la fracción insaponificable. Ambos aceites presentaron una fracción lipídica muy rica en ácidos grasos poliinsaturados ω-3 de alto peso molecular, con un 33,75% en el caso del aceite de pescado y un 43,97% en el de alga, siendo el EPA el ácido graso mayoritario en el pescado y el DHA en el alga. La relación ω-6/ω-3 fue en ambos aceites inferior a 0,4. En cuanto a la fracciσn insaponificable, el aceite de alga presentσ un contenido 3 veces menor de colesterol y una mayor proporciσn de escualeno. El contenido en fitosteroles fue significativamente superior en el aceite de alga.An important area of the development of new functional foods is facussed on finding or applying food components which favour achieving a healthier lipid profile in the organism. The objective of this work was to carry out the characterisation of the lipid fraction of two oils, fish oil and algae oil, to evaluate their potential use as functional ingredients, in relation to the high molecular weight fatty acid content and the presence of sterols and other components of the unsaponificable fraction. Both oils showed a lipid fraction rich in high molecular weight polyunsaturated ω-3 fatty acids, containing a 33.75% in the fish oil and a 43.97% in the algae oil. Eicosapentaenoic acid was the major fatty acid in fish oil, whereas docosahexaenoic was the most abundant fatty acid in algae oil. The ω-6/ω-3 ratio was lower

  20. Advanced Combustion

    Energy Technology Data Exchange (ETDEWEB)

    Holcomb, Gordon R. [NETL

    2013-03-11

    The activity reported in this presentation is to provide the mechanical and physical property information needed to allow rational design, development and/or choice of alloys, manufacturing approaches, and environmental exposure and component life models to enable oxy-fuel combustion boilers to operate at Ultra-Supercritical (up to 650{degrees}C & between 22-30 MPa) and/or Advanced Ultra-Supercritical conditions (760{degrees}C & 35 MPa).

  1. CARACTERIZACIÓN FÍSICO-QUÍMICA DEL ACEITE ESENCIAL DE ALBAHACA. II

    Directory of Open Access Journals (Sweden)

    Elizabeth Murillo

    2008-03-01

    Full Text Available Se estudió la composición química del aceite esencial de Ocimum americanum L. (albahaca querendona morada obtenido por hidrodestilación de vegetales recolectados en Chapetón-Ibagué. El análisis realizado por cromatografía de gases de alta eficiencia/detector selectivo de masas (HRGC/MSD reveló que la esencia está constituida en un 85,4% por cinamato de metilo y un 5% de estragol. Adicionalmente, se caracterizó el aceite esencialmediante la determinación de la densidad, índice de refracción, pH, solubilidad y los espectros IR y UV.

  2. Technological alternatives for the handling of high viscosity heavy crude oil and of petroleum residuals; Alternativas tecnologicas para el manejo de crudos pesados de alta viscosidad y residuales de petroleo

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez S, Ramon; Peralta M, Maria Vita; Gonzalez Santalo, Jose M.; Herrera V, J. Ramon; Arriola M, Alejandro M.; Manzanares P, Emilio; Romo M, Cesar A.; Palacios L, Elvia M. [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2006-07-01

    This work presents the technological capacity that, through the years, has been developed in emulsions of heavy oil in water preparations, as well as the potential application that this technology has in the electrical sector and the problem reduction during the extraction and handling of high viscosity heavy oils. Within this technological development it first appears the process for the formation of emulsions of residual petroleum within lots, followed by the preparation of emulsions in a continuous way within a laboratory model, and finally the production in greater scale in a pilot plant, including more and more adequate tense-actives for the formation of emulsions. Also experimental systems are presented to execute static stability and dynamic tests in different conditions, pumping tests for the handling of these emulsions and burning tests for their combustion. All of this with the purpose of consolidating the technology of residual petroleum emulsions as a profitable alternative that replaces the heavy fuel oil and to solve specific problems of the oil industry, among other benefits. [Spanish] Este trabajo exhibe la capacidad tecnologica que, a traves de los anos, se ha desarrollado en la preparacion de emulsiones de aceites pesados en agua; asi como el potencial de aplicacion que tiene dicha tecnologia en el sector electrico y la reduccion de problemas durante la extraccion y manejo de aceites pesados de alta viscosidad. Dentro de este desarrollo tecnologico figura primero el proceso para la formacion de emulsiones de residuales de petroleo dentro de lotes, seguido por la preparacion de emulsiones en continuo dentro de un laboratorio modelo, y finalmente la produccion a mayor escala en una planta piloto, incluyendo cada vez mas adecuados tenso-activos para la formacion de las emulsiones. Tambien se presentan sistemas experimentales para ejecutar pruebas de estabilidad estatica y dinamica en diferentes condiciones, pruebas de bombeo para el manejo de estas

  3. Propiedades de los aceites vegetales modificados por hidrogenacion, interesterificación y fraccionamiento

    Directory of Open Access Journals (Sweden)

    Grompone, M. A.

    1992-12-01

    Full Text Available The advent of techniques of chemical processing (hydrogenation and interesterification and physical processing (fractionation provides the manufacturer the capacity of modifying one or many physicochemical properties of an oil or fat. In the present paper the influence of the chemical interesterification and thermal fractionation without solvent on the physical properties (melting point, solid fat index of the products obtained by partial hydrogenation of soybean oil is studied. Properties of mixtures of partially hydrogenated soybean oil and totally hydrogenated coconut oil are also determined. The examples studied show that knowing the changes produced by current modification methods is useful to design fatty products for specific purposes.

    El advenimiento de técnicas de procesamiento químico (hidrogenación e interesterificación y físico (fraccionamiento proveen al industrial de la capacidad de modificar una o varias de las propiedades fisicoquímicas de una grasa o aceite. En este trabajo se estudia de un modo sistemático la influencia de la interesterificación química y del fraccionamiento térmico sin solventes sobre las propiedades físicas (punto de fusión, índice de grasa sólida de los productos obtenidos por hidrogenación parcial de aceite de soya. También se determinan las propiedades de mezclas de aceite de soya parcialmente hidrogenado con aceite de coco totalmente hidrogenado. Los ejemplos estudiados muestran que el conocimiento de los cambios ocasionados por los procesos de modificación corrientes son útiles para diseñar productos grasos para fines específicos.

  4. Fraccionamiento e interesterificacion del aceite de palma (Elaeis guineensis cultivado en la amazonia peruana

    Directory of Open Access Journals (Sweden)

    Mancini Filho, Jorge

    2008-06-01

    Full Text Available In the present work, the physical and chemical characteristics of the fruit of the oily palm coming from the river basin of the Manití (Region Loreto - Peru were studied. Also, the fractionation of the palm oil and the interesterification of mixtures of palm oil/estearin was carried out. Physico- chemical properties of the crude oil and of the products obtained and fatty acids were analysed by gas chromatography. The level of saturated fatty acids increased from 51,17% in the palm oil to 54,31% in the stearin. The best products for the food industry were the interesterified samples as they had melting points close to 37 °C.En el presente trabajo se realizó el estudio de las características físicas y químicas del fruto de la palma aceitera procedente de la cuenca del Manití. (Región Loreto - Perú. Del mismo modo se realizó el fraccionamiento e interesterificación de las mezclas de aceite de palma y estearina en las proporciones. Sobre el aceite crudo y los productos se determinaron las propiedades físico-químicos y análisis de ácidos grasos mediante la cromatografía gaseosa. El aceite de palma presenta una concentración de ácido grasos saturados de 51,17% y cuando fraccionado a 25 °C, este se incrementa en la estearina a 54,31%. Los mejores productos para la industria de alimentos son las mezclas interesterificadas de estearina tanto sola como con sus mezclas con aceite de palma, dado que presentan puntos de fusión próximos a 37 °C.

  5. Actividad antimicrobiana in vitro del aceite de girasol ozonizado sobre Streptococcus mutans

    OpenAIRE

    Irán Fernández Torres; Vicente Curtiellas Piñol; Elaine Sánchez Urrutia

    2006-01-01

    Streptococcus mutans es considerado como el principal agente etiológico de las caries bucales. El objetivo de este trabajo fue estudiar el efecto letal que ejerce el aceite de girasol ozonizado (OLEOZON®) sobre este microorganismo. Se evaluó la influencia que presentan diferentes factores, como el pH, la concentración del agente antimicrobiano OLEOZON® y el tiempo de contacto. Se determinaron las concentraciones mínimas inhibitorias, las que presentaron un comportamiento similar entre especie...

  6. Efecto del aceite esencial de Eucalyptus citriodora sobre el metabolismo energético mitocondrial

    Directory of Open Access Journals (Sweden)

    Luis Carlos Vesga

    2014-05-01

    Full Text Available Con el fin de contribuir al conocimiento de su actividad a nivel celular, se evaluó el mecanismo de acción del aceite esencial de Eucalyptus citriodora (Fam. Myrtaceae sobre la bioenergética mitocondrial, su efecto sobre la velocidad de consumo de oxígeno de mitocondrias energizadas (estados 3 y 4 y su coeficiente de control respiratorio (CCR. Además, se analizó la actividad de los complejos de la cadena respiratoria usando técnicas espectrofotométricas. Los resultados obtenidos indican que el aceite esencial de E. citriodora aumenta la velocidad del consumo de oxígeno en los estados 3 y 4, disminuye el CCR, desacopla la fosforilación oxidativa, aumenta la actividad de la citocromo c oxidasa y aumenta la actividad ATPasa en mitocondrias íntegras, a partir de la concentración de 10 μg/mL. Estos resultados sugieren que el aceite esencial o sus metabolitos afectan el funcionamiento normal del transporte de electrones de la cadena respiratoria y la síntesis de ATP.

  7. Extracción y caracterización de aceite de semillas de zapallo

    Directory of Open Access Journals (Sweden)

    Valdés Restrepo Magda Piedad

    2009-09-01

    Full Text Available Se seleccionaron 79 introducciones de zapallo (Cucurbita moschata Duch teniendo en cuenta el contenido de extracto etéreo (EE de las semillas. El EE fue estable física y químicamente, con propiedades organolépticas óptimas de aceite comestible, no presentó características de rancidez; aceite semisecante (122.90 mg/g de KOH.; índice de acidez 3.25 mg/g de KOH; la prueba presuntiva de yodo supone presencia de polinsaturación y sin formación de cristales. La composición de ácidos grasos mostró: palmítico C16:0 (25.11 – 36.94%; esteárico C18:0 (10.79 – 13.37%; linoleíco C18:2 (48.23 – 62.41%; linolénico C18:3 (0.66% y araquídico C20:0 (0.53 – 0.78%. El aceite de semilla de zapallo contiene 55.28% de ácidos grasos insaturados con una cantidad apreciable de linoleíco (55.11%. La torta de semilla presentó proteína (51.11 ± 0.95% y energía (4604. 66 ± 134.08 kcal/kg

  8. Extracción y caracterización de aceite de semillas de zapallo

    Directory of Open Access Journals (Sweden)

    Sanín Ortiz Grisales

    2009-07-01

    Full Text Available Se seleccionaron 79 introducciones de zapallo (Cucurbita moschata Duch teniendo en cuenta el contenido de extracto etéreo (EE de las semillas. El EE fue estable física y químicamente, con propiedades organolépticas óptimas de aceite comestible, no presentó características de rancidez; aceite semisecante (122.90 mg/g de KOH.; índice de acidez 3.25 mg/g de KOH; la prueba presuntiva de yodo supone presencia de polinsaturación y sin formación de cristales. La composición de ácidos grasos mostró: palmítico C16:0 (25.11 - 36.94%; esteárico C18:0 (10.79 - 13.37%; linoleíco C18:2 (48.23 - 62.41%; linolénico C18:3 (0.66% y araquídico C20:0 (0.53 - 0.78%. El aceite de semilla de zapallo contiene 55.28% de ácidos grasos insaturados con una cantidad apreciable de linoleíco (55.11%. La torta de semilla presentó proteína (51.11 ± 0.95% y energía (4604. 66 ± 134.08 kcal/kg.

  9. Efecto de la poda sobre la cantidad y el rendimiento del aceite esencial de Laurus nobilis

    Directory of Open Access Journals (Sweden)

    Ana María Callejas-Leguizamon

    2013-07-01

    Full Text Available Objetivo. Conocer el comportamiento de la planta de laurel con diferentes podas, en cuanto a su rendimiento y cantidad de aceite esencial para satisfacer las demandas del mercado. Materiales y métodos. Se monitorearon 48 plantas, ubicadas en el municipio de Nuevo Colón, Boyacá, en un diseño completamente al azar, con tres tratamientos (deshoje, despunte y el testigo sin poda en 5 estadios fenológicos, con cuatro repeticiones. Se evaluó la respuesta en cuanto a tres solventes usados en la extracción y diferentes tipos de poda. Resultados. El hexano fue el solvente que permitió mayor extracción de aceite esencial de las hojas de laurel, seguido de etanol y cloroformo-metanol, respectivamente. Asimismo, en los diferentes tratamientos de poda se demostró que la mayor cantidad de aceite esencial (p≤0,01 se obtuvo en hojas de laurel con despunte, mientras que con deshoje se obtuvo la menor cantidad. Analizando el rendimiento, se encontraron rendimientos (2,32% en las hojas de laurel con despunte, seguido de las plantas testigo (2,05% y por último las plantas con deshoje (1,24%. Conclusiones. El despunte, como práctica agronómica, en laurel representa mayores beneficios al productor y es una alternativa de valor agregado.

  10. Determinación de algunos parámetros de pureza en aceites de oliva. Resultados de un estudio colaborativo

    Directory of Open Access Journals (Sweden)

    Moreda, W.

    1995-10-01

    Full Text Available The results of a collaborative study with the participation of Governmental and Olive Oil Industry laboratories is presented. This study was carried out to determine the precision of the analytical methods used for quantifying certain components of olive oils. Samples of virgin olive oil, olive oil and residue olive oil were analysed for total sterols, sterolic composition, trans isomers from fatty acids, waxes and stigmastadienes, using the analytical methods included in the Commission Regulation EEC 2568/91 of the European Union and modifications therein, and in Document TC20/11 of the International Olive Oil Council (1993. The results have been statistically procesed according to the standard ISO 5725-1986 (E.

    Se presentan los resultados de un estudio colaborativo realizado con la participación de laboratorios de la Administración Pública y de industrias del Sector Oleícola con el objeto de determinar la precisión de los métodos analíticos que se utilizan para la cuantificación de ciertos componentes de los aceites de oliva. Esteroles totales, composición esterólica, isómeros trans de ácidos grasos, ceras y estigmastadienos han sido determinados en muestras de aceites de oliva virgen, de oliva y de orujo de oliva, mediante la aplicación de los métodos analíticos indicados en el reglamento CEE 2568/91 de la Unión Europea y posteriores modificaciones, así como en el Documento TC20/11 del Consejo Oleícola Internacional (1993. Se ha efectuado un análisis estadístico de los resultados de acuerdo con la norma ISO 5725-1986 (E.

  11. High Combustion Research Facility

    Data.gov (United States)

    Federal Laboratory Consortium — At NETL's High-Pressure Combustion Research Facility in Morgantown, WV, researchers can investigate new high-pressure, high-temperature hydrogen turbine combustion...

  12. Combustion Research Laboratory

    Data.gov (United States)

    Federal Laboratory Consortium — The Combustion Research Laboratory facilitates the development of new combustion systems or improves the operation of existing systems to meet the Army's mission for...

  13. Remediation of a Lead Smelting Polluted Alkaline Soil with Washed Honeycomb Briquette Combustion Residue%不同洗涤蜂窝煤灰渣对铅冶炼污染石灰性土壤的修复研究

    Institute of Scientific and Technical Information of China (English)

    历琳; 邢维芹; 向国强; 王亚利; 吴洪敏; 王静; 李立平

    2012-01-01

    Honeycomb briquette combustion residue ( HBCR) is the solid combustion waste of honeycomb briquette, which is widely used for cooking in rural China. Investigations have confirmed that the HBCR can be used to immobilize lead(Pb) in soil spiked with soluble Pb. The purpose of this study was to evaluate the immobilization of Pb and Cd in alkaline lead smelting polluted soils with different HBCR. A polluted soil with 2337 mg·kg-1 Pb and 21.4 mg·kg-1 Cd was amended with un-washed HBCR, water-washed HBCR or dilute hydrochloric acid-washed HBCR at the rates of 1%, 2% or 4%, respectively. The soil was theri incubated for 60 days before being analyzed for DTPA-Cd, DT-PA-Pb, pH, electrical conductivity (EC) and Olsen-P. The results showed that, for the un-washed HBCR amended soil, increasing the rates of HBCR lead to the decreasing of Cd availability, and the DTPA-Cd contents was 13.1% lower than the control(P0.05). For the acid-washed HBCR amended soil, increasing the rates of HBCR lead to the increasing of Cd availability, and the effect was significant at the rate of 4%(P (P0.05), except that the un-washed HBCR increased the pH of the soil(P<0.05 ). The EC of soil amended with un-washed HBCR at the rates of 2% or 4%, and water-washed HBCR at rate of 4% were significantly higher than the control (P< 0.05). The results suggest that the water-washed HBCR can be used to immobilize Pb and Cd in lead-smelting polluted alkaline soil, adsorption of Pb2+ on the HBCR may be the primary mechanism of Pb immobilization by water-washed HBCR.%摘 要:为了探讨不同洗涤蜂窝煤灰渣对铅冶炼污染石灰性土壤中铅和镉的稳定效果,在铅冶炼污染石灰性土壤(Pb和Cd含量分别为2337、21.4 mg· kg-1)上分别施1%、2%和4%用量的原灰渣、水洗灰渣或酸洗灰渣,培养60 d后,测定土壤DTPA-Cd、DTPA-Pb、pH、电导率(EC)和Olsen-P.结果表明:对于原灰渣,土壤镉有效性随灰渣用量的增加而降低,在4%的用量下,土

  14. Combustion chemistry

    Energy Technology Data Exchange (ETDEWEB)

    Brown, N.J. [Lawrence Berkeley Laboratory, CA (United States)

    1993-12-01

    This research is concerned with the development and use of sensitivity analysis tools to probe the response of dependent variables to model input variables. Sensitivity analysis is important at all levels of combustion modeling. This group`s research continues to be focused on elucidating the interrelationship between features in the underlying potential energy surface (obtained from ab initio quantum chemistry calculations) and their responses in the quantum dynamics, e.g., reactive transition probabilities, cross sections, and thermal rate coefficients. The goals of this research are: (i) to provide feedback information to quantum chemists in their potential surface refinement efforts, and (ii) to gain a better understanding of how various regions in the potential influence the dynamics. These investigations are carried out with the methodology of quantum functional sensitivity analysis (QFSA).

  15. Co-combustion of automotive shredder residue (ASR) and sewage sludge with a mixture of industrial and household waste in an 20MW fluidized bed combustor; Samfoerbraenning av bilfluff, roetslam och avfall i en 20 MW fluidbaeddpanna - Studier av braenslesammansaettningens paaverkan paa belaeggningsbildning

    Energy Technology Data Exchange (ETDEWEB)

    Eskilsson, David; Johansson, Andreas; Johansson, Linda; Wikstroem-Blomqvist, Evalena

    2007-07-01

    In order to prevent a further increased use of resources and to decrease the environmental impact from landfills, organic wastes are today diverted towards material and energy recovery. This creates a waste market with an increasing number of waste fractions that needs to be treated properly. As an example, in Sweden it has recently been prohibited to landfill source separated combustible waste (2002) and organic waste (2005). Wastes as automotive shredder residue (ASR) and sewage sludge can no longer be landfilled and needs to be either material or energy recovered, which challenge the waste treatment sector. This work investigates the effects of ASR and sewage sludge co-combustion in a 20 MW Energy-from-Waste plant (bubbling fluidised bed). The long term objective of the work is to increase the fuel flexibility, the boiler availability and the power production. This report focus on boiler operation and combustion performance in terms of agglomeration, deposit rates and emissions. In addition to the tests with ASR and sewage sludge, repeated measurements were performed during normal load as a reference. The results show that the co-combusted fractions of ASR and sewage sludge, which on mass basis constituted 6 % and 15 % respectively, did not increase the risk for agglomeration or deposits on heat-exchanging surfaces. Instead, compared to the two reference cases, the deposit rates decreased when sewage sludge was added. Only minor variation in the emissions was seen between the different cases. The levels of I-TEQs were far below the legislated values in all cases

  16. Co-combustion of Fossil Fuels and Waste

    DEFF Research Database (Denmark)

    Wu, Hao

    and the utilization of a waste-derived material as an additive; 3) the combustion of a biomass residue rich in phosphorus. Co-combustion of coal and SRF was conducted in an entrained flow reactor (EFR). The work revealed that when coal was co-fired with up to 25 wt% SRF, the burnout and the emissions of SO2...

  17. Estudio de la composición química de la semilla y aceite seminal de Cichorium intybus L. (Achicoria

    Directory of Open Access Journals (Sweden)

    Nolasco, S. M.

    1996-12-01

    Full Text Available Seeds from Cichorium intybus L harvested at Olavarría (Buenos Aires, Argentine were defatted with petroleum ether (60°-80° and the raw oil obtained with a yield of 13.3% dry basis. The crude oil was examined in their physicochemical characteristics had refractive index of 1.4576 (at 25°, iodine value of 124.3, saponification index of 191,4, unsaponifiable matter of 5.3 % and free fatty acid content of 6.0 (mg KOH/g. Gas chromatographic analysis of the oil revealed high levels of linoleic acid (59.8%, nearly 21% of saturated acids.
    The residual seed meal contained 16.9% of crude protein, with a low value of available lysine (1.37g/16 g N. Total and phytic acid phosphorous, calcium, ash, crude fiber, sugar, polysaccharides (non presence of starch and residual lipids contents are reported.

    Semillas de Cichorium intybus L (Achicoria cosechadas en Olavarría (prov. de Buenos Aires, Argentina se agotaron con éter de petróleo (60°-80°, obteniendo el aceite crudo con un rendimiento del 13,3% (base seca. El aceite crudo se examinó en sus características fisicoquímicas (índice de refracción: 1.4576 (a 25°, índice de iodo: 124.3, índice de saponificación: 191.4, insaponificable: 5.3%, índice de acidez: 6.0 (mgKOH/g y composición acídica. El análisis por cromatografía gaseosa de los esteres metílicos reveló un alto porcentaje de ácido linoleico (59,8%, alrededor de un 21% de ácidos saturados.
    La harina residual de extracción presentó un 16.9% b.s. de proteína cruda, con un bajo contenido en lisina disponible de 1,37 g/16 g N. Se informan valores de fósforo total y de ácido fítico, cenizas, calcio, fibra cruda, hidratos de carbono y lípidos residuales.

  18. Proceso de sacarificación y fermentación simultáneas para la conversión de la fracción celulósica del residuo de la extracción del aceite de oliva en etanol

    Directory of Open Access Journals (Sweden)

    Ballesteros, M.

    2002-09-01

    Full Text Available In this work, the residue generated in the new two-step centrifugation process for olive oil extraction is assessed for the production of bioethanol. Both olive pulp and fragmented stones fractions comprised in such residue are analyzed and tested at laboratory scale for bioconversion to ethanol by a simultaneous saccharification and fermentation (SSF process. Firstly, optima conditions for the enzymatic hydrolysis step of steam-exploded pretreated sustrates were determined. Then, simultaneous saccharification and fermentation process was assayed using the thermotolerant yeast Kluyveromyces marxianus in different assay conditions. For the selected conditions, 9 kg of unpretreated pulp or 6 kg of pretreated fragmented stones (both based on dry matter would be necessary to obtain 1 liter of ethanol.En el presente trabajo se estudia la producción de etanol-combustible a partir de la celulosa contenida en las distintas fracciones (pulpa y fragmentos de huesos que componen el residuo de la extracción de aceite de oliva mediante un proceso en dos fases. El trabajo ha consistido en una caracterización de las dos fracciones y en el estudio de la producción de etanol mediante un proceso de hidrólisis enzimática y fermentación simultáneas (SFS, a escala de laboratorio. Se ha estudiado el efecto que un pretratamiento termomecánico de explosión a vapor, previo a la etapa de hidrólisis enzimática y fermentación, tiene sobre la acción del complejo celulolítico. Por último, se han determinado las condiciones óptimas de ensayo para la sacarificación y fermentación simultáneas utilizando una cepa termotolerante de Kluyveromyces marxianus. En las condiciones de ensayo óptimas, serían necesarios 9 kg. de pulpa o 6 kg. de hueso pretratado (ambos sobre peso seco, para obtener 1 litro de etanol.

  19. EVALUACIÓN DE LA ACTIVIDAD ANTIOXIDANTE DE ACEITES ESENCIALES EN EMULSIONES DEGRADADAS POR RADIACIÓN ULTRAVIOLETA

    Directory of Open Access Journals (Sweden)

    Geovanna Tafur

    2008-03-01

    Full Text Available En este trabajo se evaluaron las actividades antioxidantes in vitro de los aceites esenciales de Origanum vulgare L., Rosmarinusofficinalis L. y Coriandrum sativum L., en emulsiones de agua en aceite (Ag/Ac y aceite en agua (Ac/Ag, sometidas al deterioro oxidativo por medio de la radiación ultravioleta A-visible (UVAVIS.En la emulsión de Ag/Ac (margarina, el aceite esencial de orégano presentó actividad antioxidante superior a la del cilantro y el romero, e incluso a la de la vitamina E, en concentraciones de 1, 10 y 20 g/kg. Se estableció además, que la acción antioxidante in vitro de los aceitesesenciales de orégano y cilantro aumentaba con su concentración en la margarina.Por último, el aceite esencial de orégano presentó una acción protectora más baja en la emulsión de Ac/Ag.

  20. EVALUACIÓN IN VITRO DE LA ACTIVIDAD ANTIBACTERIANA Y MODULADORA DE ACEITES DE MAÍZ Y SOJA

    Directory of Open Access Journals (Sweden)

    Henrique Coutinho Henrique

    2014-05-01

    Full Text Available Los aceites fijos generalmente se extrae de las semillas, que se utilizan principalmente en productos alimenticios, por lo que parte de la dieta humana. El aceite de soja y el maíz son los más populares, tienen una alta calidad de proteína nutricional adecuado, con un contenido importante de minerales y fibra, y también redujo la cantidad de grasas saturadas. En este contexto, el objetivo fue el de evaluar la actividad antibacteriana y la modulación de estos dos aceites fijos industrializados, principalmente debido a su carácter lipofílico y su uso en la dieta diaria. Ambas pruebas se realizaron utilizando el método de microdilución en caldo. La actividad de los aminoglucósidos se mejoró cuando se combina con aceite de maíz, en comparación con E. coli 27. Se sugiere que el aceite es una sustancia no polar interactúa con la membrana para facilitar la entrada de los fármacos en la célula.

  1. EXTRACCIÓN Y CARACTERIZACIÓN DEL ACEITE CRUDO DE LA ALMENDRA DE DURAZNO Prunus pérsica

    Directory of Open Access Journals (Sweden)

    Peggy Londoño

    2012-01-01

    Full Text Available Se extrajo y purificó el aceite de la almendra de durazno con el propósito de recomendar su utilización desde el punto de vista químico y tecnológico. La purificación comprende el desgomado, la neutralización, en la cual se pone en contacto el aceite con solución de soda cáustica a 12,14 y 16º Bé. Seguidamente el blanqueado, donde el aceite neutralizado se trata con tierras blanqueantes en diferentes proporciones. El blanqueado se obtiene utilizando un porcentaje de tierra de 1,5 % el menor índice de peroxido – 2,03 meq O 2 kg -1 – y una acidez de 0,08 % como ácido oleico. Los ácidos grasos mayoritarios encontrados fueron oleico 77,9 % y linoleico 15,5 %. El aceite refinado es más estable que el aceite crudo y se puede recomendar su uso en la elaboración de diversos productos químicos previo a una evaluación toxicológica exhaustiva

  2. EFECTO DEL OIL PULLING CON ACEITE DE COCO VIRGEN PRENSADO AL FRIO Y EL COLUTORIO DE BICARBONATO EN EL PH ÁCIDO DE PACIENTES ADULTOS. CONSULTA PRIVADA. AREQUIPA, 2015

    OpenAIRE

    CÁRDENAS VARGAS, ANGELA GRETEL

    2016-01-01

    ACEITE DE COCO HISTORIA COMPOSICIÓN CARACTERÍSTICAS FÍSICAS PROPIEDADES DEL ACEITE DE COCO LENJUAGUE CON ACEITE DE COCO (OIL PULLING) MECANISMO DE ACCIÓN PROCEDIMIENTO PARA REALIZAR EL OIL PULLING CON ACEITE DE COCO BENEFICIOS DEL OIL PULLING BICARBONATO DE SODIO CARACTERÍSTICAS FÍSICAS PROPIEDADES DEL BICARBONATO DE SODIO PH SALIVAL PH SALIVAL Y METABOLISMO BACTERIANO ACIDES EN LA CAVIDAD BUCAL ANTECEDENTES INVESTIGATIVOS

  3. Temperature Estimation in the Combustion Chamber of an Internal Combustion Engine

    OpenAIRE

    2012-01-01

    The mathematical model of heat transfer phenomena is considered at the combustion chamber wall in an internal combustion (IC) engine. The mathematical model of proposed phenomena is established with respect to the crank angle. An inverse heat conduction problem is derived at the cylinder wall, and this problem is investigated numerically using Alifanov's regularization method. This problem studied as an optimization problem in which a squared residual functional is minimized with the conjugat...

  4. Evaluación de la extracción del aceite de la Triportheus magdalenae y análisis del perfil lipídico del aceite crudo

    Directory of Open Access Journals (Sweden)

    Denilson Padilla Cerpa

    2012-02-01

    Full Text Available Se evaluó el rendimiento en la extracción química del aceite de la especie íctica Arenca (Triportheus magdalenae mediante la aplicación previa de dos tipos de digestión (ácida y acido-alcohólica, a través de un diseño experimental de bloques completamente al azar (DBCA. La extracción del aceite fue realizada por el método químico soxhlet; (adaptado del método, 960.39-AOAC para carnes y el análisis del perfil lipídico del aceite crudo fue realizado por cromatografía Gaseosa, demostrando que los dos tipos de digestión aplicadas producen un aumento en el rendimiento de la extracción química del aceite, obteniéndose mayor rendimiento con la digestión ácida, según la Diferencia Media Significativa (DMS con una p<0,05. Se determinó que la T. magdalenae, presenta una cantidad de aceite crudo en promedio de 3,23%, predominado por ácidos grasos insaturados (AGI, en un 56,77%, con proporción en ácidos grasos esenciales de la serie Omega 3 (ω-3 y omega 6 (ω-6, entre los que sobresalen el Eicosapentaenoico (EPA, el Docosapentaenoico (DPA y el Linolénico para ω-3; el linoleíco y el araquidónico para ω-6. Los resultados obtenidos permiten considerar la especie estudiada como viable para la obtención de aceites, de características farmacéuticas y medicinales.

  5. Fritura de patatas en aceite de girasol. Estudio comparativo del grado de alteración del aceite de la freidora y del extraído de las patatas

    Directory of Open Access Journals (Sweden)

    Sánchez Muniz, F. J.

    1994-10-01

    Full Text Available The alteration ocurring in a sunflower oil used discontinuously to fry potatoes in 15 succesive occasions and in the oil content in fried potatoes was studied. According to the Perevalov colorimetric test, the spectrophotometric absorption and the percentage of both nonpolar triglycerides (%NPT and nonpolar methyl esters (%NPME the alteration increased either in the bath oil or in the extracted oil with the number of frying occasions. The refraction index increased only in the extracted oil. A higher thermoxidative alteration in the fried potato oil was assesed by all indexes with the exception of %NME. However, according to the %NPT such alteration was lower than the according to the %NPT such alteration was lower than the recomended for oil discarding suggesting a still acceptable quality of the fried potatoes.

    Se estudia la alteración de un aceite de girasol durante 15 frituras sucesivas y discontinuas de patatas, así como en el aceite extraído de las mismas. En ambos aceites se incrementa significativamente la alteración termoxidativa con el número de frituras, según indica la prueba de Perevalov, la medida espectrofotométrica, así como los porcentajes de triglicéridos no alterados (%TNA y de ésteres metílicos no alterados (%EMNA. Sólo en el aceite extraído de las patatas se observan variaciones en el índice de refracción. Excepto para el %EMNA los demás índices estudiados sugieren que el aceite extraído de las patatas fritas presenta una alteración termoxidativa superior al del baño, si bien dicha alteración es inferior a lo recomendado por la legislación respecto al %TNA para desechar un aceite de fritura y por consiguiente indicativo de una aceptable calidad del producto frito.

  6. Oxygen-enhanced combustion

    CERN Document Server

    Baukal, Charles E

    2013-01-01

    Combustion technology has traditionally been dominated by air/fuel combustion. However, two developments have increased the significance of oxygen-enhanced combustion-new technologies that produce oxygen less expensively and the increased importance of environmental regulations. Advantages of oxygen-enhanced combustion include less pollutant emissions as well as increased energy efficiency and productivity. Oxygen-Enhanced Combustion, Second Edition compiles information about using oxygen to enhance industrial heating and melting processes. It integrates fundamental principles, applications, a

  7. La familia Euphorbiaceae como fuente de aceites vegetales para la industria tecnoquímica

    Directory of Open Access Journals (Sweden)

    Correal Castellanos, E.

    1992-02-01

    Full Text Available The family Euphorbiaceae includes a huge number of species some of which provide important raw materials such as rubber, cassava, waxes and oils. In this study, the general botanical and chemical characteristics of this family are described firstly together with the chemical composition of their seed oils and a comparison with those of other families. Secondly, other chemical constituents of economic interest are reviewed and compared with the species already used for food, industry and medicine purposes. A further revision is included on some of its genus with potential interest and on current industrial oil crops such as Ridnus, Euphorbia, Aleurites, Sapium, Jatropha, etc. Finally, from an economic point of view, future prospects of some of these oils as raw materials for the chemical industry are given.La familia Euphorbiaceae contiene gran número de especies de las que se pueden obtener productos de interés económico como el caucho, la tapioca, ceras y aceites. En este trabajo se estudian en primer lugar las características botánicas y químicas de la familia y las peculiaridades de los aceites de sus semillas y se comparan con los de otras familias. En segundo lugar, se revisan otros compuestos químicos así como especies de interés económico utilizadas en alimentación, medicina o industria, incluyendo géneros con potencial interés y los actuales cultivos oleaginosos industriales como Ridnus, Euphorbia, Aleurites, Sapium, Jatropha, etc. Finalmente, desde un punto de vista de mercado, se apuntan las perspectivas de estos aceites como materias primas para la industria química.

  8. Perspectivas globales de utilización de grasas y aceites. Presente y futuro

    Directory of Open Access Journals (Sweden)

    Leysen, Ir. Rogar

    1996-10-01

    Full Text Available The paper shows current overview and the perspectives related to the production of oilseeds, fats and oils as well as the consumption of them. The study is based on the evolution of several variables such as changes in population, policies, incomes, prices, availability of natural resources (land for agriculture and environmental impact. With respect to technology, the work comments the possible influences of biotechnology transportation systems, milling, and some transformations for specific uses. Among the promising uses of vegetable oils the following are mentioned: utilization as biodiesel, adhesives, biodegradable plastics, printing inks, lubricating oils, hydraulic fluids or, even, new tendencies in the area of nutrition (foods with pharmacological effects.

    El trabajo comenta el estado actual y las perspectivas de futuro de la producción de semillas oleaginosas, aceites y grasas, así como el consumo de los mismos. Dicho estudio, se basa en la evolución de una serie de variables tales como los cambios de población, políticas, ventas, precios, disponibilidad de los recursos naturales (tierras para la producción agrícola y el impacto sobre el Medio Ambiente. En el aspecto tecnológico se hace especial mención sobre el impacto previsible de la biotecnología, transporte, molienda y posibles transformaciones para determinados usos. Entre las aplicaciones prometedoras de los aceites vegetales se mencionan el empleo como biodiesel, adhesivos, plásticos biodegradables, tintas de impresión, aceites lubricantes y líquidos hidráulicos e, incluso, nuevas tendencias en el campo de la alimentación (alimentos con algún papel de índole farmacológico.

  9. Análisis de Pulpa y Aceite de Aguacate con Espectroscopia Infrarroja

    Directory of Open Access Journals (Sweden)

    J. H. Castorena-García

    2011-01-01

    Full Text Available La espectroscopia infrarroja con reflectancia total atenuada ha revolucionado los análisis instrumentales en diversos tipos de materiales, incluyendo los de origen biológico. Las aplicaciones se enfocan a identificación, cuantificación de compuestos químicos, detección de cambios a nivel molecular y contrastar la autenticidad de un producto. El objetivo de esta investigación fue analizar la pulpa y aceite de aguacate por medio de la espectroscopia infrarroja. Para la pulpa se observaron varias bandas de absorción centradas en 1653 cm-1, asignada a la vibración de tipo extensiva C=O (amida I de las proteínas, 1547 cm-1 (N¿H flexión, amida II, y 1237 cm-1 (N¿H flexión, amida III. El espectro del aceite de aguacate extraído muestra los grupos C¿H, en el rango 3000 a 2800 cm-1, y una banda intensa en 1744 cm-1 atribuida al enlace C=O, vibraciones de extensión del grupo éster carbonilo. Del último grupo de frecuencias, la relación de intensidades entre la absorbancia en 3007 cm-1 (banda extensiva insaturada =C¿H y la absorbancia en 2924 cm-1 (banda extensiva ¿C¿H, fue utilizada para estimar el valor del índice de yodo del aceite, éste fue 74.8, valor dentro del rango de 69 a 95, obtenido mediante pruebas químicas.

  10. REMEDIACIÓN DE SUELOS CONTAMINADOS CON ACEITE DE MOTOR MEDIANTE TENSIOACTIVOS ALTAMENTE BIODEGRADABLES

    OpenAIRE

    Ignacio Moya-Ramírez; Miguel García-Román; María Henares-Jiménez; Encarnación Jurado-Alameda; Deisi Altmajer-Vaz

    2014-01-01

    En el presente trabajo se ha estudiado el proceso de remediación de un suelo arenoso contaminado con aceite de motor, empleando dos sistemas de lavado, uno discontinuo y otro continuo. Además se evaluó la capacidad de tres surfactantes altamente biodegradables, dos sintéticos (Glucopon 600 y Findet 1214N/23) y un biosurfactante producido por Bacillus subtilis, para facilitar la eliminación del contaminante. Los resultados obtenidos con el sistema continuo fueron mejores en todos los casos a l...

  11. Diacilgliceroles en la evaluación de la calidad de aceite de oliva virgen

    Directory of Open Access Journals (Sweden)

    Catalano, M.

    1994-12-01

    Full Text Available Virgin olive oil samples were analyzed within one month after extraction and after one year; edible and lampante olive oil samples were analyzed before and after neutralization of free acids.
    In addition to the usual quality parameters, the amount and position isomers of diglycerides were equally assessed.
    It was found that extra virgin olive oils, even through analyzed after one year, still meet at least two of the following five requirements: a total diglycerides < 2.0%; b 1,2-diglycerides < 1.5%; c 1,3-diglycerides < 0,4%; d total diglycerides x 1,3-diglycerides < 1.0; e total diglycerides/1,3-diglycerides > 5.0.
    It is therefore suggested that for extra virgin oils to be defined, they should comply with at least two of the above parameters, in addition to the characters prescribed for by EC Regulations Nos. 2568/91 and 183/93.

    Se han analizado muestras de aceite de oliva virgen dentro del primer mes después de la extracción y después del primer año; también se han analizado muestras de aceite de oliva comestible y lampante antes y después de la neutralización de los ácidos libres.
    Además de los parámetros usuales de calidad se han evaluado igualmente los contenidos e isómeros de posición de los diglicéridos.
    Se encontró que los aceites de oliva extra vírgenes, incluso los analizados después del primer año, aún satisfacían al menos dos de los siguientes cinco requisitos: a diglicéridos totales < 2.0%; b 1,2-diglicéridos < 1.5%; c 1,3-diglicéridos < 0.4%; d diglicéridos totales x 1,3-diglicéridos < 1.0; e diglicéridos totales/1,3-diglicéridos > 5.0.
    Se sugiere por tanto que para ser definidos como aceites vírgenes extra, deben cumplir con al menos dos de los parámetros anteriores, además de con las características establecidas por las Regulaciones Números 2568/91 y 183/93 de la CE.

  12. Planificación estratégica Aceites Sureste S.L.

    OpenAIRE

    Sánchez Muñoz, Diego

    2013-01-01

    El tema del trabajo fin de grado planteado tiene como finalidad, elaborar un modelo de planificación estratégica para la microempresa “Aceites Sureste S.L”, con la finalidad de poder formular estrategias para el logro de objetivos mediante el ajuste más apropiado de la organización con su entorno. Actualmente nos encontramos en escenarios de alto nivel de exigencias y muy competitivos, tener éxito ya no es cuestión de ser emprendedor o tener visión empresarial, además de que el empresario ...

  13. Efecto del aceite esencial de Eucalyptus citriodora sobre el metabolismo energético mitocondrial

    OpenAIRE

    2014-01-01

    Con el fin de contribuir al conocimiento de su actividad a nivel celular, se evaluó el mecanismo de acción del aceite esencial de Eucalyptus citriodora (Fam. Myrtaceae) sobre la bioenergética mitocondrial, su efecto sobre la velocidad de consumo de oxígeno de mitocondrias energizadas (estados 3 y 4) y su coeficiente de control respiratorio (CCR). Además, se analizó la actividad de los complejos de la cadena respiratoria usando técnicas espectrofotométricas. Los resultados obtenidos indican qu...

  14. 不同洗涤蜂窝煤灰渣对污染土壤中铅的稳定作用研究%Immobilization of Lead in Soil with Washed Honeycomb Briquette Combustion Residue

    Institute of Scientific and Technical Information of China (English)

    李立平; 席欢; 邢维芹; 向国强; 张科; 胡昌乾

    2012-01-01

    Phosphate has been widely used as the most effective amendment for lead(Pb) in soil. Due to the limited phosphate rock resource, people are trying wastes or by-products as alternatives for phosphate. Honeycomb briquette combustion residue (HBCR) is a common solid waste in rural China. Our earlier work observed that HBCR could be used to immobilize Pb in soil, however, application of HBCR in soil resulted in elevated pH and electric conductivity( EC). In order to decrease its negative effect on the pH and EC of soil, HBCR was washed with water or dilute hydrochloric acid ( HC1) before being applied to a soil spiked with 1 000 mg · kg-1 Pb. The water- or dilute HCl-washing decreased pH( 1.94 and 3.70 pH unit, respectively, compared with the un-washed HBCR) and EC(0.785 and 0.890 mS·cm-1) of the HBCR greatly, and the availability and the total content of heavy metals slightly. Application of the water- or dilute HCl-washed HBCR resulted in higher availability of phosphorus in the soil. The concentrations of DTPA-extractable Pb in the soils amended with un-washed, water-washed and dilute HCl-washed HBCR decreased 67.2 mg·kg-1, 195 mg·kg-1 and 117 mg·kg-1, while these values were 102 mg·kg-1, 91.8 mg·kg-1 and 86.8 mg·kg-1, when amended with additional amendment of phosphate. The differences between the amended soils and the control were statistically significant at 0.05 level. Sequential extraction of the soil Pb indicated that the effect of different amendments on the Pb speciation was not robust. These results suggested that both water-and dilute HC1 -washings were effective in reducing the pH and EC of the HBCR, while water-washing was more effective in improving or maintaining the immobilization effect of Pb of HBCR.%蜂窝煤灰渣具有稳定污染土壤中铅的作用,但可增大土壤pH和电导率(EC).将蜂窝煤灰渣经过水洗和稀盐酸酸洗后加入铅污染土壤(1000mg.kg-1Pb),研究了不同处理灰渣对铅有效

  15. Evaluación nutricional y sensorial del aceite de Proboscidea parviflora (uña de gato

    Directory of Open Access Journals (Sweden)

    Vázquez-Moreno, L.

    2003-03-01

    Full Text Available The seed of Proboscidea parviflora (cat´s claw has shown a great nutritional potential due to the good nutritional quality presented by its flour. In order to integrate the study of the seeds and to know a use for the oil, it was considered of interest to valuate biologically the crude oil and to sensory evaluate the patatoes fried in oil P. parviflora refined. Seeds of Proboscidea parviflora have shown a great potential due to the good nutritional quality of its flour. As part of the integral study, here is presented a crude oil biological evaluation and a sensorial evaluation of potatoes fried in refined P. parviflora oil. Diets were prepared adding 8, 11 and 16 % of crude oil and PER, NPR and the apparent digestibilty were determinated. PER values for each percentage were 2.7, 3.1 and 3 % respectively. While digestibilities were of 97, 98 and 97 % for each level of oil addition (there was not significative difference of PProboscidea parviflora presented good digestibility and high PER values comparable to the corn oil.La semilla de Proboscidea parviflora (uña de gato ha mostrado un gran potencial alimenticio debido, a la buena calidad nutricional que ha presentado la harina. Con el fin de integrar más el estudio de la semilla y de conocer el uso del aceite, se consideró de interés valorar biológicamente el aceite crudo y evaluar sensorialmente patatas fritas en aceite refinado de P. parviflora (uña de gato. El aceite de Proboscidea parviflora (uña de gato, fue evaluado con adición de 8, 11 y 16 % de aceite crudo en las dietas, mediante los ensayos de PER, NPR y digestibilidad aparente. Realízándose también el análisis sensorial de las patatas fritas en el aceite refinado. Obteniéndose un PER de 2.7, 3.1 y 3 % para cada nivel de aceite, valores altos con diferencia significativa de PProboscidea parviflora (uña de gato presentó buena digestibilidad, PER alto y comparable a la del aceite de maíz.

  16. Combustion 2000

    Energy Technology Data Exchange (ETDEWEB)

    A. Levasseur; S. Goodstine; J. Ruby; M. Nawaz; C. Senior; F. Robson; S. Lehman; W. Blecher; W. Fugard; A. Rao; A. Sarofim; P. Smith; D. Pershing; E. Eddings; M. Cremer; J. Hurley; G. Weber; M. Jones; M. Collings; D. Hajicek; A. Henderson; P. Klevan; D. Seery; B. Knight; R. Lessard; J. Sangiovanni; A. Dennis; C. Bird; W. Sutton; N. Bornstein; F. Cogswell; C. Randino; S. Gale; Mike Heap

    2001-06-30

    . To achieve these objectives requires a change from complete reliance of coal-fired systems on steam turbines (Rankine cycles) and moving forward to a combined cycle utilizing gas turbines (Brayton cycles) which offer the possibility of significantly greater efficiency. This is because gas turbine cycles operate at temperatures well beyond current steam cycles, allowing the working fluid (air) temperature to more closely approach that of the major energy source, the combustion of coal. In fact, a good figure of merit for a HIPPS design is just how much of the enthalpy from coal combustion is used by the gas turbine. The efficiency of a power cycle varies directly with the temperature of the working fluid and for contemporary gas turbines the optimal turbine inlet temperature is in the range of 2300-2500 F (1260-1371 C). These temperatures are beyond the working range of currently available alloys and are also in the range of the ash fusion temperature of most coals. These two sets of physical properties combine to produce the major engineering challenges for a HIPPS design. The UTRC team developed a design hierarchy to impose more rigor in our approach. Once the size of the plant had been determined by the choice of gas turbine and the matching steam turbine, the design process of the High Temperature Advanced Furnace (HITAF) moved ineluctably to a down-fired, slagging configuration. This design was based on two air heaters: one a high temperature slagging Radiative Air Heater (RAH) and a lower temperature, dry ash Convective Air Heater (CAH). The specific details of the air heaters are arrived at by an iterative sequence in the following order:-Starting from the overall Cycle requirements which set the limits for the combustion and heat transfer analysis-The available enthalpy determined the range of materials, ceramics or alloys, which could tolerate the temperatures-Structural Analysis of the designs proved to be the major limitation-Finally the commercialization

  17. Combustion 2000

    Energy Technology Data Exchange (ETDEWEB)

    A. Levasseur; S. Goodstine; J. Ruby; M. Nawaz; C. Senior; F. Robson; S. Lehman; W. Blecher; W. Fugard; A. Rao; A. Sarofim; P. Smith; D. Pershing; E. Eddings; M. Cremer; J. Hurley; G. Weber; M. Jones; M. Collings; D. Hajicek; A. Henderson; P. Klevan; D. Seery; B. Knight; R. Lessard; J. Sangiovanni; A. Dennis; C. Bird; W. Sutton; N. Bornstein; F. Cogswell; C. Randino; S. Gale; Mike Heap

    2001-06-30

    . To achieve these objectives requires a change from complete reliance of coal-fired systems on steam turbines (Rankine cycles) and moving forward to a combined cycle utilizing gas turbines (Brayton cycles) which offer the possibility of significantly greater efficiency. This is because gas turbine cycles operate at temperatures well beyond current steam cycles, allowing the working fluid (air) temperature to more closely approach that of the major energy source, the combustion of coal. In fact, a good figure of merit for a HIPPS design is just how much of the enthalpy from coal combustion is used by the gas turbine. The efficiency of a power cycle varies directly with the temperature of the working fluid and for contemporary gas turbines the optimal turbine inlet temperature is in the range of 2300-2500 F (1260-1371 C). These temperatures are beyond the working range of currently available alloys and are also in the range of the ash fusion temperature of most coals. These two sets of physical properties combine to produce the major engineering challenges for a HIPPS design. The UTRC team developed a design hierarchy to impose more rigor in our approach. Once the size of the plant had been determined by the choice of gas turbine and the matching steam turbine, the design process of the High Temperature Advanced Furnace (HITAF) moved ineluctably to a down-fired, slagging configuration. This design was based on two air heaters: one a high temperature slagging Radiative Air Heater (RAH) and a lower temperature, dry ash Convective Air Heater (CAH). The specific details of the air heaters are arrived at by an iterative sequence in the following order:-Starting from the overall Cycle requirements which set the limits for the combustion and heat transfer analysis-The available enthalpy determined the range of materials, ceramics or alloys, which could tolerate the temperatures-Structural Analysis of the designs proved to be the major limitation-Finally the commercialization

  18. Specifics of phytomass combustion in small experimental device

    Directory of Open Access Journals (Sweden)

    Lenhard Richard

    2015-01-01

    Full Text Available A wood pellet combustion carries out with high efficiency and comfort in modern pellet boilers. These facts help to increase the amount of installed pellet boilers in households. The combustion process quality depends besides the combustion conditions also on the fuel quality. The wood pellets, which don`t contain the bark and branches represent the highest quality. Because of growing pellet demand, an herbal biomass (phytomass, which is usually an agricultural by-product becomes economically attractive for pellet production. Although the phytomass has the net calorific value relatively slightly lower than the wood biomass, it is often significantly worse in view of the combustion process and an emission production. The combustion of phytomass pellets causes various difficulties in small heat sources, mainly due to a sintering of fuel residues. We want to avoid the ash sintering by a lowering of temperature in the combustion chamber below the ash sintering temperature of phytomass via the modification of a burner design. For research of the phytomass combustion process in the small boilers is constructed the experimental combustion device. There will investigate the impact of cooling intensity of the combustion chamber on the combustion process and emissions. Arising specific requirements from the measurement will be the basis for the design of the pellet burner and for the setting of operating parameters to the trouble-free phytomass combustion was guaranteed.

  19. Adición de aceites vegetales a la dieta de cabras lecheras: efecto sobre el contenido de ácidos grasos de la grasa láctea

    OpenAIRE

    AL Martínez Marín; P Gómez-Cortés; LM Pérez Alba; Juárez, M.; AG Gómez Castro; Pérez Hernández, M.; MA de la Fuente

    2012-01-01

    [ES]: El objetivo del presente trabajo fue investigar el efecto de la adición de aceites vegetales de diferente grado de insaturación a la dieta de cabras lecheras sobre el perfil de ácidos grasos de la grasa láctea. Doce cabras de raza Malagueña fueron asignadas al azar a uno de cuatro tratamientos: dieta basal sin aceite añadido y la misma dieta basal adicionada con 48 g/d de aceite de girasol alto oleico, aceite de girasol normal o aceite de lino. La dieta estuvo compuesta por heno de alfa...

  20. Potencial contaminante del mar por aguas residuales de las industrias de harinas y aceites de pescado

    Directory of Open Access Journals (Sweden)

    Mendiola, Santiago

    1998-02-01

    Full Text Available . In this study we addressed the polluting potential that constitutes the disposal of wastewater from the fish meal and oil Industries Into the sea. With this aim we have analysed some phisico-chemical and bacteriologic aspects of the effluents of these industries, including: weight percentage of organic matter, chemical oxygen load, fatty acids saturation, and presence of Salmonellas. The results suggest a low polluting potential for these effluents, although the acid pH and the high rate of saturation found In fatty acids of oil fishes could imply a certain toxicity for the marine environment.

    En este trabajo se evalúa el potencial contaminante que representa el vertido al mar de los desechos procedentes de las industrias de harinas y aceites de pescado. Para ello se han analizado algunos aspectos de la composición físico-química y bacteriológica de los efluentes residuales de estas industrias, incluyendo entre otros: porcentaje en peso de materia orgánica, demanda química de oxígeno, saturación de ácidos grasos y presencia de Salmonellas. Los resultados muestran en general un bajo potencial contaminante de estas aguas residuales, aunque su pH ácido y el alto grado de saturación encontrado en los ácidos grasos de los aceites de pescado podrían conllevar una cierta toxicidad para el medio marino.

  1. Calidad sensorial de aceites de oliva virgen procedentes de variedades de aceitunas producidas en Extremadura

    Directory of Open Access Journals (Sweden)

    Martínez Cano, Manuel

    2006-09-01

    Full Text Available Abencor system of olives sampled in 2000 - 01 of the Cacereña, Carrasqueña, Cornezuelo, Corniche, Morisca, Picual and Verdial de Badajoz varieties in different stages of ripeness have been evaluated. The analysis of variance taking into account the variety and ripeness data shows the differences found for the different attributes that characterize them. Likewise, the correlation between the physicochemical characteristics of these oils and their attributes are shown.Se han evaluado sensorialmente 129 muestras de aceites de oliva virgen, obtenidas por el sistema Abencor, de aceitunas muestreadas en la campaña 2000 – 01 de las variedades Cacereña, Carrasqueña, Cornezuelo, Corniche, Morisca, Picual y Verdial de Badajoz, en diferentes estados de maduración. Un análisis de varianza teniendo en cuenta los factores variedad y estado de maduración, muestra las diferencias encontradas para los diferentes atributos que las caracterizan. Así mismo, se indican las características físicoquímicas elementales de estos aceites y su correlación con los atributos ya mencionados.

  2. OBTENCIÓN DE FRACCIONES ENRIQUECIDAS DURANTE LA EXTRACCIÓN DE ACEITES ESENCIALES CRUDOS

    Directory of Open Access Journals (Sweden)

    María S. Guala

    2012-01-01

    Full Text Available La destilación por arrastre con vapor es uno de los métodos más utilizados para la obtención de aceite esencial crudo (AEC. Muchas aplicaciones requieren fracciones de AEC, enriquecidas en un componente o grupo de ellos, para lo cual se utiliza destilación al vacío. En este trabajo se propone realizar un fraccionamiento del aceite esencial crudo (AEC durante el proceso de extracción por destilación con arrastre de vapor, para lo cual se colectaron distintos cortes, en lugar de una única mezcla final que es la metodología tradicionalmente utilizada. Las experiencias se llevaron a cabo utilizando frutos, hojas y tallos de aguaribay (Schinus molle L.. La composición de las distintas muestras obtenidas se determinó por cromatografía gaseosa acoplada a espectroscopía de masas. Los resultados muestran diferentes componentes (y concentraciones para los diferentes cortes, lo que indica que se puede lograr una apreciable separación utilizando esta metodología.

  3. Curado natural y acelerado de una arcilla estabilizada con aceite sulfonado

    Directory of Open Access Journals (Sweden)

    Javier Camacho-Tauta

    2008-01-01

    Full Text Available La efectividad en la estabilización de arcillas expansivas por medio de aceite sulfonado depende de las condiciones ambientales durante el curado. Se propone analizar especímenes de arcilla sometiéndolos a diferentes períodos de curado natural y, simultáneamente, mediante curado artificial acelerado. La relación entre el tiempo de curado natural y el tiempo equivalente de curado acelerado depende del tipo de material estudiado, las condiciones ambientales del lugar que se desean simular y los parámetros que se consiguen controlar en una cámara de envejecimiento acelerado. Para tal objetivo se llevaron a cabo ensayos de plasticidad de muestras estabilizadas con aceite sulfonado, sometidas a diferentes períodos de curado tanto en condiciones naturales como en una cámara de envejecimiento acelerado. Se obtuvo un factor de curado acelerado para el material estudiado y se encontraron diferencias entre el proceso de curado natural y el curado acelerado.

  4. Particle Emissions from Biomass Combustion

    Energy Technology Data Exchange (ETDEWEB)

    Szpila, Aneta; Bohgard, Mats [Lund Inst. of Technology (Sweden). Div. of Ergonomics and Aerosol Technology; Strand, Michael; Lillieblad, Lena; Sanati, Mehri [Vaexjoe Univ. (Sweden). Div. of Bioenergy Technology; Pagels, Joakim; Rissler, Jenny; Swietlicki, Erik; Gharibi, Arash [Lund Univ. (Sweden). Div. of Nuclear Physics

    2003-05-01

    We have shown that high concentrations of fine particles of the order of 2-7x10{sup -7} particles per cm{sup 3} are being formed in all the combustion units studied. There was a higher difference between the units in terms of particle mass concentrations. While the largest differences was found for gas-phase constituents (CO and THC) and polyaromatic hydrocarbons. In 5 out of 7 studied units, multi-cyclones were the only measure for flue-gas separation. The multicyclones had negligible effect on the particle number concentration and a small effect on the mass of particles smaller than 5 {mu}m. The separation efficiency was much higher for the electrostatic precipitators. The boiler load had a dramatic influence on the coarse mode concentration during combustion of forest residue. PM0.8-6 increased from below 5 mg/m{sup 3} to above 50 mg/m{sup 3} even at a moderate change in boiler load from medium to high. A similar but less pronounced trend was found during combustion of dry wood. PM0.8-PM6 increased from 12 to 23 mg/m{sup 3} when the load was changed from low to high. When increasing the load, the primary airflow taken through the grate is increased; this itself may lead to a higher potential of the air stream to carry coarse particles away from the combustion zone. Measurements with APS-instrument with higher time-resolution showed a corresponding increase in coarse mode number concentration with load. Additional factor influencing observed higher concentration of coarse mode during combustion of forest residues, could be relatively high ash content in this type of fuel (2.2 %) in comparison to dry wood (0.3 %) and pellets (0.5 %). With increasing load we also found a decrease in PM1 during combustion of forest residue. Whether this is caused by scavenging of volatilized material by the high coarse mode concentration or a result of a different amount of volatilized material available for formation of fine particles needs to be shown in future studies. The

  5. On supersonic combustion

    Institute of Scientific and Technical Information of China (English)

    袁生学

    1999-01-01

    Some basic concepts and features of supersonic combustion are explained from the view point of macroscopic aerodynamics. Two kinds of interpretations of supersonic combustion are proposed. The difference between supersonic combustion and subsonic combustion is discussed, and the mechanism of supersonic combustion propagation and the limitation of heat addition in supersonic flow are pointed out. The results of the calculation of deflagration in supersonic flow show that the entropy increment and the total pressure loss of the combustion products may decrease with the increase of combustion velocity. It is also demonstrated that the oblique detonation wave angle may not be controlled by the wedge angle under weak underdriven solution conditions and be determined only by combustion velocity. Therefore, the weak underdriven solution may become self-sustaining oblique detonation waves with a constant wave angle.

  6. Combustion Research Facility

    Data.gov (United States)

    Federal Laboratory Consortium — For more than 30 years The Combustion Research Facility (CRF) has served as a national and international leader in combustion science and technology. The need for a...

  7. Actividad inhibitoria del aceite esencial de Lippia origanoides H.B.K sobre el crecimiento de Phytophthora infestans

    Directory of Open Access Journals (Sweden)

    óscar Arango Bedoya

    2015-04-01

    Full Text Available Phytophthora infestans (Mont. de Bary es el fitopatógeno más perjudicial de la papa (Solanum tuberosum al causar la enfermedad conocida como ‘gota o tizón tardío’. El objetivo de este trabajo fue evaluar la actividad in vitro del aceite esencial obtenido de una especie de orégano silvestre (Lippia origanoides H.B.K. sobre Phytophthora infestans. Para el efecto se evaluaron diferentes concentraciones de este aceite esencial (10, 50, 100, 150, 200, 250 µg/ml y de un fungicida comercial usado como testigo. La actividad antifúngica se determinó con base en la evaluación del crecimiento del micelio mediante el método de dilución en agar tomate. A partir de una concentración de aceite de 150 µg/ml se inhibió completamente el crecimiento del patógeno, por lo que ésta fue considerada como la concentración letal. Este estudio demostró que el aceite esencial de orégano silvestre del Alto Patía, Colombia, es un potencial agente antifúngico que podría ser usado en sistemas de control integrado de P. infestans.

  8. Aceites de oliva vírgenes y refinados: Diferencias en componentes menores glicerídicos

    Directory of Open Access Journals (Sweden)

    Pérez-Camino, M. C.

    1993-04-01

    Full Text Available This paper defines the main differences in glyceridic minor compounds between virgin and refined olive oils. Modifications during the steps of the refining process are studied and compared with differences found in two series of virgin and refined oils and those during storage. The results demonstrate that the absence of polymerized compounds is the most useful parameter for the characterization of virgin oils while the presence of dimeric triglycerides and a high ratio diglycerides/fatty acids are those for refined oils.

    En el presente trabajo se definen las principales diferencias en componentes menores glicerídicos entre aceites de oliva vírgenes y refinados. Para ello, se estudian las modificaciones que tienen lugar durante las distintas etapas del proceso de refinación, se comprueban las diferencias encontradas en dos series de aceites vírgenes y refinados y, finalmente, se analizan las modificaciones originadas durante el almacenamiento. Los resultados demuestran que la ausencia de compuestos de polimerización es de gran valor para la caracterización de los aceites de oliva vírgenes, mientras que, la presencia de dímeros de triglicéridos y la elevada relación diglicéridos/ácidos grasos son las características principales de los aceites refinados.

  9. EFECTO SINÉRGICO DEL ACEITE ESENCIAL DE Origanum vulgare A LA GENTAMICINA EN CULTIVOS DE Escherichia coli.

    Directory of Open Access Journals (Sweden)

    Luis Chávez Torres

    2012-02-01

    Full Text Available Objetivo: El presente trabajo tuvo como propósito determinar el efecto sinérgico antibacteriano entre el aceite esencial de Origanum vulgare y la Gentamicina en aislados de Escherichia coli. Diseño: Estudio experimental Lugar: Centro Latinoamericano de Enseñanza e Investigación en Bacteriología Alimentaria (CLEIBA Participantes: Placas Petri conteniendo E. Coli ATCC 25922, aceite esencial de orégano y Gentamicina. Intervenciones: Se aplicó el método de Kirby Bauer (discos de difusión en 20 placas Petri. Se aisló la cepa Escherichia coli ATCC 25922. El grupo Experimental fue tratado con discos de papel filtro, embebidos con Gentamicina y aceite esencial de orégano al 75%; mientras que el grupo Control, con discos de Gentamicina sola. Se realizó la medición de los halos y se registraron los datos. Principales medidas de resultados: Se evaluó el diámetro de los halos de inhibición Resultados: Los halos de inhibición del grupo Experimental resultaron 22,375 mm., mayores que los del grupo Control (20,75 mm. La prueba T determinó que la diferencia era estadísticamente significativa, p = 0,001 (p < 0,05. Conclusiones: Existe un efecto sinérgico antibacteriano in vitro entre el aceite esencial de Origanum vulgare y la gentamicina en E. coli.

  10. Efecto sinérgico del aceite esencial de Origanum vulgare a la Gentamicina en cultivos de Escherichia coli.

    Directory of Open Access Journals (Sweden)

    Luis Chávez Torres

    2008-01-01

    Full Text Available Objetivo: El presente trabajo tuvo como propósito determinar el efecto sinérgico antibacteriano entre el aceite esencial de Origanum vulgare y la Gentamicina en aislados de Escherichia coli. Diseño: Estudio experimental Lugar: Centro Latinoamericano de Enseñanza e Investigación en Bacteriología Alimentaria (CLEIBA Participantes: Placas Petri conteniendo E. Coli ATCC 25922, aceite esencial de orégano y Gentamicina. Intervenciones: Se aplicó el método de Kirby Bauer (discos de difusión en 20 placas Petri. Se aisló la cepa Escherichia coli ATCC 25922. El grupo Experimental fue tratado con discos de papel filtro, embebidos con Gentamicina y aceite esencial de orégano al 75%; mientras que el grupo Control, con discos de Gentamicina sola. Se realizó la medición de los halos y se registraron los datos. Principales medidas de resultados: Se evaluó el diámetro de los halos de inhibición Resultados: Los halos de inhibición del grupo Experimental resultaron 22,375 mm., mayores que los del grupo Control (20,75 mm. La prueba T determinó que la diferencia era estadísticamente significativa, p = 0,001 (p < 0,05. Conclusiones: Existe un efecto sinérgico antibacteriano in vitro entre el aceite esencial de Origanum vulgare y la gentamicina en E. coli.

  11. Estrategia ambiental en el manejo de efluentes en la extracción de aceite de palma

    Directory of Open Access Journals (Sweden)

    María Bonomie

    2012-09-01

    Full Text Available En el proceso de extracción de aceite de palma, se consideran alternativas de separación de los residuos sólidos y líquidos para el aprovechamiento (si es posible total del efluente. Estos residuos sólidos de naturaleza orgánica, y las descargas líquidas, suelen considerarse de bajo impacto en comparación con otros procesos productivos de algunos sectores industriales. En este sentido, la presente investigación tiene como propósito analizar el manejo de los efluentes en el proceso de extracción de aceite de palma o aceite rojo. Asimismo, se presenta la estrategia ambiental en este tipo de proceso utilizando la producción más limpia. La investigación es de tipo analítica, no experimental de campo; la población se delimitó a las empresas del sector de palma aceitera que desarrolla el proceso de extracción de aceite. Se realizaron varias visitas y entrevistas al personal de estas empresas; siendo necesario aclarar que para efectos de esta investigación, solamente se considera la producción de aceite rojo, en virtud de que del proceso de producción se obtienen dos sub productos, aceite de palmiste y harina de palmiste. Los resultados, indican que existen efluentes en las diferentes etapas del proceso de extracción de aceite, los cuales reciben un tratamiento especial, por lo que requieren de áreas que desempeñan actividades de apoyo, tales como: control de calidad, mantenimiento y generación de energía, las cuales intervienen en la generación y tratamiento de los efluentes. Se concluye que las empresas que utilizan este tipo de proceso productivo, emplean estrategias innovadoras para disminuir el impacto ambiental, en aras de mejorar el desempeño ambiental en este tipo de organización.

  12. Residuation theory

    CERN Document Server

    Blyth, T S; Sneddon, I N; Stark, M

    1972-01-01

    Residuation Theory aims to contribute to literature in the field of ordered algebraic structures, especially on the subject of residual mappings. The book is divided into three chapters. Chapter 1 focuses on ordered sets; directed sets; semilattices; lattices; and complete lattices. Chapter 2 tackles Baer rings; Baer semigroups; Foulis semigroups; residual mappings; the notion of involution; and Boolean algebras. Chapter 3 covers residuated groupoids and semigroups; group homomorphic and isotone homomorphic Boolean images of ordered semigroups; Dubreil-Jacotin and Brouwer semigroups; and loli

  13. Study on Semi-Gasification Combustion Technology of Stover

    Directory of Open Access Journals (Sweden)

    Zhao Qing-Ling

    2013-04-01

    Full Text Available In order to develop a mechanism of clean and efficient combustion, this study studied the combustion mechanism of stover semi-gasification by a clean stove designed. The experimental material was corn Stover briquettes. Process of semi-gasification combustion can be divided into two parts: gasification stage and combustion stage. First, under the low primary air amount, stover gives off partly combustible gas (Volatile matter. Then, the combustible gas rises and burns in the upper Furnace when it meets higher secondary air amount. At the same time, the residue remained in bottom Furnace keeps on gasifying and burning under high temperature until the fuel is exhausted. In the process, two phases (solid and gas combustion becomes into one phase (gas combustion. Due to inadequate primary air and low temperature of semi-gasification chamber (550-750℃, all the ash was loose and no slag was found. Moreover, combustible gas produced was directly completely burned off and no tar appeared in the emissions. According to the result, the combustion thermal efficiency of clean stove (75% is up to 75% and higher than primary stove (below 12%.

  14. Fuel and Combustion Characteristics of Organic Wastes

    Science.gov (United States)

    Namba, Kunihiko; Ida, Tamio

    From a viewpoint of environmental preservation and resource protection, the recycling of wastes has been promoting. Expectations to new energy resource are growing by decrease of fossil fuel. Biomass is one of new energies for prevent global warning. This study is an attempt to burn biomass lamps made from residues in order to thermally recycle waste products of drink industries. The pyrolytic properties of shochu dregs and used tea leaves were observed by thermo-gravimertic analysis (TG) to obtained fundamental data of drink waste pyrolysis. It observed that shochu dregs pyrolyze under lower temperature than used tea leaves. These wastes were compressed by hot press apparatus in the temperature range from 140 to 180 °C for use as Bio-fuel (BF). The combustion behavior of BF was observed in fall-type electric furnace, where video-recording was carried out at sequential steps, such as ignition, visible envelope flame combustion and char combustion to obtain combustion characteristics such as ignition delay, visible flame combustion time and char combustion time.

  15. Estabilidad oxidativa y estimación de la vida útil del aceite de sacha inchi (Plukenetia volubilis L.

    Directory of Open Access Journals (Sweden)

    Gilbert Rodríguez

    2015-01-01

    Full Text Available El aceite de sacha inchi es rico en ácidos grasos poli-insaturados que podrían oxidarse, limitando su vida útil. El método Rancimat, es oficial, para evaluaciones aceleradas de estabilidad oxidativa en aceites. A nivel industrial se usan técnicas convencionales basadas en indicadores fisicoquímicos, no existiendo estudios de correlación entre ellas y Rancimat. Este trabajo tiene por objetivo correlacionar el índice de estabilidad oxidativa (OSI en aceite de sacha inchi obtenido mediante Rancimat a temperaturas de 80º, 90º, 100º y 110 ºC bajo un flujo de aire de 15 L/h, con los valores de indicadores fisicoquímicos tales como Índice de peróxido, p-anisidina, totox y densidad. Asimismo estimar mediante extrapolación matemática, la vida útil del aceite de sacha inchi a temperaturas usuales de almacenamiento. Se encontró valores OSI de: 0,493 ± 0,01 h a 110 ºC, 1,590 ± 0,06 h a 100 ºC, 4,645 ± 0,1 h a 90 ºC y 20,512 ± 0,02 h a 80 ºC. Se ha establecido alta correlación entre valores de OSI vs índices fisicoquímicos de calidad (0,9322 < r < 0,9965. La energía de activación encontrada fue de 137,90 kJ/mol, lo que explica la alta estabilidad oxidativa para el aceite, estimándose una vida útil de 3,29, 1,79 y 0,79 años a 20, 25 y 30 °C respectivamente.

  16. Ácidos grasos y parámetros de calidad del aceite de semilla de uva silvestre (Vitis spp.

    Directory of Open Access Journals (Sweden)

    O. Franco-Mora

    2015-01-01

    Full Text Available México es centro de origen de varias especies de Vitis. La gran mayoría de ellas no son empleadas en la agricultura e industrias derivadas. Como parte de la exploración de su potencial agroindustrial se identificó y cuantificó a los ácidos grasos del aceite de semilla de vid silvestre (Vitis spp. de frutos de Temascaltepec, México y de la accesión E-201, cultivada en Zumpahuacán, México. El contenido promedio de aceite en la semilla fue de 16,7%, encontrando ácido linoleico (71,5%, oleico (17,2%, palmítico (6,6% y esteárico (4,3%. En el aceite obtenido en vides de Temascaltepec se determinó índice de yodo (57,9 g/100 g, índice de saponificación (170,7 mg/g e índice de peroxidos (30 mEq/kg, valores relacionados posiblemente al contenido de ácidos grasos insaturados. Sin embargo, ese mismo grado de insaturación no concordó con el punto de humeo observado (211 °C, lo cual posiblemente está relacionado con el contenido de ácidos palmítico y esteárico. El aceite de semilla de vid silvestre cumple parcialmente con los estándares establecidos para el aceite de semilla de V. vinifera, lo cual implica su potencial culinario, agroindustrial y cosmetológico.

  17. EVALUACIÓN DEL ÍNDICE DE ESTABILIDAD OXIDATIVA DEL ACEITE DE MORINGA (Moringa oleífera) POR EL MÉTODO RANCIMAT

    OpenAIRE

    Alberca Tocto, Solansh Kiara; Universidad Señor de Sipán; Huanca Vásquez, Miguel Angel; Universidad Señor de Sipán; Esquivel Paredes|, Lourdes Jossefyne; Universidad Señor de Sipán

    2015-01-01

    La rancidez oxidativa principal causa de la pérdida de calidad de los aceites, ya que se desconoce el tiempo de vida en anaquel de estos productos; la estabilidad (resistencia a la oxidación) es uno de los factores que preocupa a los productores por ser uno de los principales criterios de calidad en aceites y grasas, por ello el objetivo de evaluar índice de estabilidad oxidativa del aceite virgen de las semillas de Moringa oleífera (Humedad 8.54±0.02%), por el método acelerado de rancimat, e...

  18. Composición química y actividad antibacteriana del aceite esencial del Origanum vulgare (orégano).

    OpenAIRE

    ALBADO PLAUS, Emilia; SAEZ FLORES, Gloria; GRABIEL ATAUCUSI, Sandra

    2013-01-01

    Objetivo: Determinar la actividad antimicrobiano en el aceite esencial (Carvacrol) del Origanum vulgare. Material y métodos: El aceite esencial se obtuvo por destilación por arrastre con vapor de agua, a partir de las hojas y flores desecadas de O. vulgare; se determinó la gravedad especifica con un pinnómetro y el índice de refracción con refractómetro de Abbc; la composición química se evaluó mediante cromatografía de gas con detector de masa (GLSM). La actividad antimicrobiana del aceite d...

  19. Modeling the internal combustion engine

    Science.gov (United States)

    Zeleznik, F. J.; Mcbride, B. J.

    1985-01-01

    A flexible and computationally economical model of the internal combustion engine was developed for use on large digital computer systems. It is based on a system of ordinary differential equations for cylinder-averaged properties. The computer program is capable of multicycle calculations, with some parameters varying from cycle to cycle, and has restart capabilities. It can accommodate a broad spectrum of reactants, permits changes in physical properties, and offers a wide selection of alternative modeling functions without any reprogramming. It readily adapts to the amount of information available in a particular case because the model is in fact a hierarchy of five models. The models range from a simple model requiring only thermodynamic properties to a complex model demanding full combustion kinetics, transport properties, and poppet valve flow characteristics. Among its many features the model includes heat transfer, valve timing, supercharging, motoring, finite burning rates, cycle-to-cycle variations in air-fuel ratio, humid air, residual and recirculated exhaust gas, and full combustion kinetics.

  20. Estudio de la calidad del aceite de oliva virgen de Aragón

    Directory of Open Access Journals (Sweden)

    Herrera, A.

    2003-06-01

    Full Text Available The chemical composition of virgin olive oils (95 samples from Aragón (Spain from two successive crop seasons (1997/98 and 1998/99 and its relationship with quality and oxidative stability is examined. The main characteristics were: free acidity 0.5 (% oleic acid, peroxide value 11.8 meq/kg, K232 1.92, K270 0.13, oxidative stability 51.4 h (Rancimat method, and antioxidant phenolic substances 168.5 mg/kg (as caffeic acid. From the distribution of fatty acids, a high percentage of linoleic acid (9.46 % and a low level of stearic (2.10 % and arachidic (0.36 % acids, is worth noting. The effect of sample origin (7 productive regions from Aragón, olive variety (Empeltre and Arbequina, and the different steps through processing are also investigated. However, the major factor affecting results was the plague of olive flies during 1997/98 crop season.Se ha estudiado la composición química de 95 muestras de aceite de oliva virgen de Aragón procedente de dos campañas sucesivas (1997/98 y 1998/99 y su relación con la calidad y la estabilidad oxidativa. Las principales características fueron una acidez de 0,5 (% ácido oleico, índice de peróxidos 11,8 meq/kg, K232 1,92, K270 0,13, estabilidad a la oxidación 51,4 h (método Rancimat y contenido en polifenoles antioxidantes 168,5 mg/kg (como ácido caféico. Del perfil de ácidos grasos, destaca el elevado contenido en linoleico (9,46 % y las bajas tasas de esteárico (2,10 % y aráquico (0,36 %. Se analiza el efecto de la procedencia de las muestras (7 comarcas productoras de Aragón, de la variedad de la aceituna (Empeltre o Arbequina y de las distintas fases del procesado del aceite. Se destaca la gran influencia sobre la calidad del aceite de la plaga de mosca sufrida durante la campaña de 1997/98.

  1. Empleo de arcillas uruguayas pilareadas para el blanqueo de aceite de maiz.

    Directory of Open Access Journals (Sweden)

    Pagano, T.

    1998-02-01

    Full Text Available In the present paper adsorptive capacity to remove carotenes from a com oil by an Uruguayan montmorillonite modified by different treatments: exchange with Na+ ions (M-Na, acid-activation (Act, exchange with Ca2+ and pillaring with Keggin ions (Pile-Act, acid-activation and pillaring (Act Pil-Ca, is studied. Bleaching action of the Uruguayan modified montmorillonites is compared with two commercial days: Tonsil Optimum (Süd-Chemie and montmorillonite of type K 10 (Aldrich. Our results demonstrate that Act and Pilc-Ca samples are so efficient bleaching clays as commercials but M-Na sample Is lower. Also, mixtures of Pilc-Ca with commercial clays, added together in one step or consecutively in two steps, are studied. These procedures do not improved the bleaching action. As conclusion, the modified clay Pilc-Ca allows to bleach a neutralized and degummed corn oil, giving an end product similar to edible commercial oils. Such effect is improved with the simultaneous action with activated clays.

    En este trabajo se estudia la capacidad de adsorción de los carotenos presentes en un aceite de maíz, de una montmorillonita uruguaya modificada por diferentes procedimientos: intercambiada con iones Na+ (M-Na, activada por ácido (Act, intercambiada con iones Ca2+ y pilareada con iones Keggin (Pilc-Ca, activada por ácidos y pilareada (Act Pilc-Ca frente a dos arcillas comerciales: Tonsil Optimum de Süd-Chemie y una Montmorillonita tipo K 10 de Aldrich. Los resultados indican que la muestra Act y la Pilc-Ca son tan eficientes como las comerciales pero que la capacidad de la muestra M-Na es considerablemente menor. También se efectuó ensayos con mezclas de Pilc-Ca con las arcillas comerciales, colocadas simultáneamente (en una sola etapa o agregadas de manera sucesiva (en dos etapas. Dichos procedimientos no mejoraron la eficiencia del blanqueo. En conclusión, la modificación Pilc-Ca permite

  2. Emulsiones alimentarias aceite-en-agua estabilizadas con proteínas de atún

    Directory of Open Access Journals (Sweden)

    Ruiz-Márquez, D.

    2010-12-01

    Full Text Available This work is focused on the development of o/w salad dressing-type emulsions stabilized by tuna proteins. The influence of protein conservation methods after the extraction process (freezing or liofilization on the rheological properties and microstructure of these emulsions was analyzed. Processing variables during emulsification were also evaluated. Stable emulsions with adequate rheological and microstructural characteristics were prepared using 70% oil and 0.50% tuna proteins. From the experimental results obtained, we may conclude that emulsion rheological properties are not significantly affected by the protein conservation method selected. On the contrary, an increase in homogenization speed favours an increase in the values of the linear viscoelastic functions. Less significant is the fact that as agitation speed increases further, mean droplet size steadily decreases.

    El presente trabajo se ha centrado en el desarrollo de emulsiones alimentarias aceite-en-agua estabilizadas con proteínas de atún. Específicamente, se ha analizado la influencia del método de conservación de las proteínas aisladas (liofilización, congelación y de las condiciones de procesado seleccionadas sobre el comportamiento reológico y la microestructura de dichas emulsiones. Se han preparado emulsiones aceite en agua (con un contenido del 70% en peso de aceite estabilizadas con proteínas de atún. La concentración de emulsionante usada ha sido 0,50% en peso. El comportamiento reológico de estas emulsiones no depende significativamente del método de conservación de la proteína empleado. Por otra parte, un aumento de la velocidad de agitación durante el proceso de manufactura de la emulsión da lugar a una disminución continua del tamaño medio de gota y a un aumento de las funciones viscoelásticas dinámicas, menos significativo a medida que aumenta dicha velocidad de agitación.

  3. Combustion characteristics of eastern white pine bark and Douglas fir planer shavings. Technical Progress Report No. 5, September 16, 1977--September 15, 1978

    Energy Technology Data Exchange (ETDEWEB)

    Junge, D.C.

    1978-12-01

    Significant quantities of wood residue fuels are presently being used in industrial steam generating facilities. Recent studies indicate that substantial additional quantities of wood residue fuels are available for energy generation in the form of steam and/or electricity. A limited data base on the combustion characteristics of wood residue fuels has resulted in the installation and operation of inefficient combustion systems for these fuels. This investigation of the combustion characteristics of wood residue fuels was undertaken to provide a data base which could be used to optimize the combustion of such fuels. Optimization of the combustion process in industrial boilers serves to improve combustion efficiency and to reduce air pollutant emissions generated in the combustion process. Data are presented on the combustion characteristics of eastern white pine bark mixed with Douglas fir planer shavings.

  4. Comparative study on systems of residual water treatment in the process industry by evaporation, using fossils fuels or solar energy; Estudio comparativo sobre sistemas de tratamiento de aguas residuales de la industria de procesamiento por evaporacion, utilizando combustibles fosiles o energia solar

    Energy Technology Data Exchange (ETDEWEB)

    Landgrave Romero, Julio; Canseco Contreras, Jose [Facultad de Quimica, UNAM (Mexico)

    1996-07-01

    The residual water treatment of the process industry, nowadays is an imminent necessity in our country. In the present study two different forms are considered to concentrate residual waters: multiple effect evaporation and solar evaporation. The use of solar evaporation lagoons is a good possibility to conserving energy by means of the diminution of fossil fuel consumption. The design basis of the evaporation systems via multiple effect, as well as solar evaporation, the results of the respective sizing and the estimation of the corresponding costs are presented. A practical case is described on the cooking of cotton linters (flock) [Spanish] El tratamiento de aguas residuales de la industria de proceso, hoy en dia es una necesidad inminente en nuestro pais. En el presente trabajo se consideran dos formas distintas para concentrar las aguas residuales: evaporacion de multiple efecto y evaporacion solar. El empleo de lagunas de evaporacion solar es una buena posibilidad para conseguir el ahorro de energia mediante disminucion del consumo de combustibles fosiles. Se presentan las bases de diseno de los sistemas de evaporacion via multiple efecto, asi como solar, los resultados del dimensionamiento respectivo y la estimacion de los costos correspondientes. Se describe un caso practico sobre el cocido de linters de algodon (borra)

  5. Aceite de oliva, sistema inmune e infección Olive oil, immune system and infection

    Directory of Open Access Journals (Sweden)

    M.ª A. Puertollano

    2010-02-01

    Full Text Available Los ácidos grasos de naturaleza poliinsaturada ω-3 han recibido una gran atención en los últimos años como componentes de la dieta supresores de las funciones inmunes y por ello han sido aplicados en la resolución de diferentes desórdenes de naturaleza inflamatoria. Aunque la inhibición de algunas funciones inmunes por la acción de estos ácidos grasos ejerce efectos beneficiosos en la disminución de la respuesta inflamatoria del individuo, este estado puede conducir a una reducción significativa de la protección del individuo frente a microorganismos de naturaleza infecciosa (virus, bacterias, hongos y parásitos. Sin embargo, el aceite de oliva (constituido principalmente por ácidos grasos monoinsaturados y uno de los componentes principales de la dieta Mediterránea modula también algunas de estas funciones, sin reducir de forma tan severa la resistencia inmune del individuo frente a agentes de naturaleza infecciosa. Bajo estas premisas podemos afirmar que la administración de aceite de oliva puede contribuir a la reducción de la actividad inflamatoria observada en algunas enfermedades crónicas caracterizadas por desórdenes inmunes, sin agravar la susceptibilidad del individuo a agentes patógenos. Por lo tanto, la aplicación del aceite de oliva en emulsiones lipídicas puede tener efectos beneficiosos sobre la salud y particularmente sobre el sistema inmune de individuos inmunocomprometidos, adquiriendo una gran importancia en nutrición clínica. El presente trabajo de revisión contribuye a clarificar la interrelación existente entre la administración de dietas constituidas por aceite de oliva y el sistema inmune, así como a determinar el efecto que este componente esencial de la dieta Mediterránea juega en la inmunomodulación en los estados de infección.Polyunsaturated fatty acids contribute to the suppression of immune system functions. For this reason, n-3 polyunsaturated fatty acids have been applied in the

  6. Determinación de las propiedades físicas y carga crítica del aceite vegetal Jatropha curcas L // Determination of physical properties and critical load of Jatropha curcas L vegetable oil

    Directory of Open Access Journals (Sweden)

    Calixto Rodríguez-Martínez

    2012-09-01

    Full Text Available En el trabajo se determinaron las propiedades físicas y la carga critica del aceite de Jatropha curcas L, obtenido de las plantas cultivadas en la provincia de Guantánamo en Cuba. Estas propiedades fueron comparadas con las propiedades de otros aceites vegetales (aceite ricino, aceite de girasol, aceite de colza y aceite de soya usados como biolubricantes. Los resultados mostraron que las propiedades físicas del aceite de Jatropha curcas L fueron similares a la mayoría de los aceites vegetales. La carga crítica del aceite de la Jatropha curcas L ocupa una posición intermedia entre el aceite ricino y los aceites de girasol, colza y soya, lo cual permite asegurar que el aceite de Jatropha curcas L es un buen candidato para como biolubricante.Palabras claves: biolubricantes, aceites vegetales, Jatropha curcas L, propiedades físicas, carga crítica._______________________________________________________________________________AbstractIn this paper the physical properties and the critical load of the Jatropha curcas L oil, plantations located in Guantanamo province, Cuba were determined. These properties together with other vegetable oils (castor, sunflower, rapeseed and soybean oils used as biolubricant were compared. These results have showed that the physical properties of the Jatropha curcas L oil were similar to most of vegetable oils.The critical load of Jatropha curcas oil has an intermediate position just castor oil and sunflower, rapeseed and soybean oils. Jatropha curcas oil has good potential as the renewable energy as well as biolubricant feedstock.Key words: biolubricants, vegetable oils, Jatropha curcas L, physical properties, critical load.

  7. Boiler using combustible fluid

    Science.gov (United States)

    Baumgartner, H.; Meier, J.G.

    1974-07-03

    A fluid fuel boiler is described comprising a combustion chamber, a cover on the combustion chamber having an opening for introducing a combustion-supporting gaseous fluid through said openings, means to impart rotation to the gaseous fluid about an axis of the combustion chamber, a burner for introducing a fluid fuel into the chamber mixed with the gaseous fluid for combustion thereof, the cover having a generally frustro-conical configuration diverging from the opening toward the interior of the chamber at an angle of between 15/sup 0/ and 55/sup 0/; means defining said combustion chamber having means defining a plurality of axial hot gas flow paths from a downstream portion of the combustion chamber to flow hot gases into an upstream portion of the combustion chamber, and means for diverting some of the hot gas flow along paths in a direction circumferentially of the combustion chamber, with the latter paths being immersed in the water flow path thereby to improve heat transfer and terminating in a gas outlet, the combustion chamber comprising at least one modular element, joined axially to the frustro-conical cover and coaxial therewith. The modular element comprises an inner ring and means of defining the circumferential, radial, and spiral flow paths of the hot gases.

  8. Estudio in vitro de la viabilidad de células Caco-2 en presencia de componentes del aceite esencial de Allium spp

    OpenAIRE

    Llana Ruiz-Cabello, M.; Puerto, M.; D Gutiérrez-Praena; Pichardo, S.; A. Jos; Cameán, A. M.

    2013-01-01

    El aceite esencial de los componentes del género Allium, principalmente ajo y cebolla, presenta propiedades antioxidantes y antibacterianas debidas a la presencia de compuestos azufrados en su composición. La industria alimentaria ha comenzado a desarrollar nuevos sistemas de envasado activo a partir de polímeros seleccionados, a los que se incorporan aceites esenciales que, por sus propiedades, contribuyen a aumentar la vida útil de los alimentos perecederos. En este sentido, se hace necesar...

  9. Coal combustion products

    Science.gov (United States)

    Kalyoncu, R.S.; Olson, D.W.

    2001-01-01

    Coal-burning powerplants, which supply more than half of U.S. electricity, also generate coal combustion products, which can be both a resource and a disposal problem. The U.S. Geological Survey collaborates with the American Coal Ash Association in preparing its annual report on coal combustion products. This Fact Sheet answers questions about present and potential uses of coal combustion products.

  10. Elaboración del aceite de oliva virgen mediante sistema continuo en dos fases. Influencia de diferentes variables del proceso en algunos parámetros relacionados con la calidad del aceite

    Directory of Open Access Journals (Sweden)

    Jiménez Márquez, A.

    1995-10-01

    Full Text Available The introduction of new technology for industrial extraction of olive oil requires a knowledge of how this could affect certain oil parameters in regulation of the extraction process.
    The oil's total polyphenols content, K225 and autoxidation stability were related with variations in temperature, kneading time, paste injection flow rate and oil washing in vertical centrifuges in a two-phase decanter without addition of water to the olive paste.
    Kneading the olive paste at low temperature, extended kneading at low paste injection rates, oil washing with hot water and high water:oil ratio, yielded oil of low stability, low polyphenols content and low bitterness.

    Con la implantación, en el sector de la elaboración del aceite de oliva virgen, de nuevos avances tecnológicos, se hace necesario el conocimiento de cómo puede afectar a determinados parámetros del aceite obtenido las diferentes formas de conducir el proceso.
    Se estudia la respuesta de los polifenoles totales, amargor y estabilidad frente a la oxidación, respecto a las variaciones de temperatura, tiempo de batido, ritmo de producción y lavado del aceite en centrífugas verticales, en un sistema de dos fases en el que no se emplea agua de dilución de masa en la inyección de ésta al decanter.
    Se observa que batiendo la masa a temperaturas bajas, prolongando el batido, y en consecuencia a ritmos lentos, y cuanto mayor es la temperatura y cantidad de agua en el lavado, el aceite obtenido es de menor estabilidad, de contenido más bajo en polifenoles y menos amargo.

  11. Improved inventory for heavy metal emissions from stationary combustion plants

    DEFF Research Database (Denmark)

    Nielsen, Malene; Nielsen, Ole-Kenneth; Hoffmann, Leif

    for stationary combustion plants and the corresponding improved emission inventories for the following HMs: Arsenic (As), Cadmium (Cd), Chromium (Cr), Copper (Cu), Mercury (Hg), Nickel (Ni), Lead (Pb), Selenium (Se) and Zinc (Zn). The report presents data for the year 2009 and time series for 1990......-2009. The report also include methodology, references and an uncertainty estimate. In Denmark, stationary combustion plants are among the most important emission sources for heavy metals. Emissions of all heavy metals have decreased considerably (73 % - 92 %) since 1990. The main HM emission sources are coal...... combustion, waste incineration, residual oil combustion and in 2009 also combustion of biomass. The emission from waste incineration plants has decreased profoundly also in recent years due to installation and improved performance of flue gas cleaning devices. The emission from power plants have also...

  12. Combustion in fluidized bed reactors; Verbrennung in Wirbelschichtreaktoren

    Energy Technology Data Exchange (ETDEWEB)

    Thome-Kozmiensky, Karl J. [vivis CONSULT GmbH, Nietwerder (Germany)

    2013-03-01

    Since the first application for the coal gasification, the fluidized bed technology has passed an impressive development. Nowadays, the fluidized bed technology is utilized at chemical processes, drying and cooling, gasification, combustion and purification of exhaust gas. In the firing technology, the fluidized technology initially has been proved in the combustion of very high ash coal and sewage sludge. Recently, the fluidized bed technology also is applied in the drying of sewage sludge, combustion of domestic waste - as in Japan and Sweden - as well as in the gasification and combustion of substitute fuels, biomass - wood pellets, wood chips, straw, cocoa shells and so forth - and residues from the paper manufacturing - such as in Germany and Austria. Under this aspect, the author of the contribution under consideration reports on the combustion of sewage sludge, substitute fuels and biomass.

  13. Dioxines, furans and other pollutants emissions bond to the combustion of natural and additive woods; Facteurs d'emission. Emissions de dioxines, de furanes et d'autres polluants liees a la combustion de bois naturels et adjuvantes

    Energy Technology Data Exchange (ETDEWEB)

    Collet, S

    2000-02-15

    This report deals especially on the dioxines and furans bond to the combustion of wood in industrial furnaces and domestic furnaces. It aims to define the environmental strategy which would allow the combustion of wood residues to produce energy. The first part recalls general aspects concerning the wood. The six other parts presents the wood resources and wastes, the additive used, the combustion and the different factors of combustion and finally the pollutants emissions. (A.L.B.)

  14. Research Combustion Laboratory (RCL)

    Data.gov (United States)

    Federal Laboratory Consortium — The Research Combustion Laboratory (RCL) develops aerospace propulsion technology by performing tests on propulsion components and materials. Altitudes up to 137,000...

  15. Combustion Byproducts Recycling Consortium

    Energy Technology Data Exchange (ETDEWEB)

    Paul Ziemkiewicz; Tamara Vandivort; Debra Pflughoeft-Hassett; Y. Paul Chugh; James Hower

    2008-08-31

    Ashlines: To promote and support the commercially viable and environmentally sound recycling of coal combustion byproducts for productive uses through scientific research, development, and field testing.

  16. Obtención de biodiesel con aceite de maíz usado en frituras y metacaolinita como catalizador

    OpenAIRE

    Jorge Ramírez-Ortiz; Jorge Medina-Valtierra; José Merced Martínez Rosales

    2011-01-01

    Se investigó la producción de biodiesel usando un reactor intermitente, se utilizó la metacaolinita como un catalizador sólido ácido que presentó una alta actividad para la producción de biodiesel a partir de aceite de maíz usado en freidora. El área superficial de la metacaolinita, diámetro de poro y volumen de poro fueron 10 m2/g, 13.0 nm y 30 mm3/g, respectivamente. Las condiciones óptimas para la reacción de transesterificación fueron: una relación molar aceite/metanol 1:31, temperatura d...

  17. Aceites vegetales sobre ácidos grasos y producción de metano in vitro en vacas lecheras.

    Directory of Open Access Journals (Sweden)

    Esperanza Prieto-Manrique

    2016-12-01

    Full Text Available El objetivo de este trabajo fue evaluar el efecto de la adición de aceites vegetales en dietas representativas de vacas lecheras bajo pastoreo, sobre los ácidos grasos, fermentación ruminal y producción de metano in vitro. La investigación se desarrolló en el laboratorio NUTRILAB–GRICA, perteneciente a la Facultad de Ciencias Agrarias, Universidad de Antioquia, Medellín, Colombia, en agosto del 2013. Se utilizó la técnica de producción de gas in vitro. En cuatro dietas (dos de monocultivo en Cynodon plectostachyus y dos de sistema silvopastoril intensivo con Leucaena leucocephala, se evaluó la adición de tres aceites vegetales (girasol, lino y palma a nivel del 2 y 4% de la MS, en un diseño completamente al azar con arreglo factorial de 4x3x2. En todas las dietas, la suplementación con aceite de girasol aumentó el contenido de ácido linoleico (C18:2 c9,12, ácido linoleico conjugado (ALC-c9t11 y ácido transvaccénico (ATV, C18:1 t11 después de la fermentación (p0,05. Ningún aceite afectó la cinética de fermentación, pH, total de ácidos grasos volátiles (AGV, proporción de AGV, ni la producción de metano.

  18. Combustion characteristics of Douglas Fir planer shavings. Technical progress report No. 4, September 16, 1977--September 15, 1978

    Energy Technology Data Exchange (ETDEWEB)

    Junge, D.C.

    1978-12-01

    Significant quantities of wood residue fuels are presently being used in industrial steam generating facilities. Recent studies indicate that substantial additional quantities of wood residue fuels are available for energy generation in the form of steam and/or electricity. A limited data base on the combustion characteristics of wood residue fuels has resulted in the installation and operation of inefficient combustion systems for these fuels. This investigation of the combustion characteristics of wood residue fuels was undertaken to provide a data base which could be used to optimize the combustion of such fuels. Optimization of the the combustion process in industrial boilers serves to improve combustion efficiency and to reduce air pollutant emissions generated in the combustion process. This report presents data on the combustion characteristics of Douglas Fir planer shavings. The data were obtained in a pilot scale combustion test facility at Oregon State Univerisity. Other technical reports present data on the combustion characteristics of: Douglas Fir bark, Red Alder sawdust, Red Alder bark, Ponderosa pine bark, Hemlock bark, and Eastern White Pine bark. An executive summary report is also available which compares the combustion characteristics of the various fuel species.

  19. Estudio del comportamiento térmico y la composición de aceites para el curtido de cueros

    Directory of Open Access Journals (Sweden)

    Grompone, M. A.

    2000-06-01

    Full Text Available The leather industry uses fatty materials to give leather certain characteristics. Neatsfoot oil, a material with variable cost and disponibility, has been used traditionally. Samples of neatsfoot, chicken, fish and rice bran oils are studied in this work. They are evaluated as potential raw materials for leather tanning derivatives, according to their thermal behaviour (Cold Test and DSC and main fatty acids composition (GC. Some seem adequate for that purpose, while others could be modified through thermal fractionation.La industria del cuero utiliza materiales grasos que otorgan determinadas características al cuero. Tradicionalmente se ha usado, entre otros, el aceite de patas de vacuno, producto cuya disponibilidad y costo son muy variables. En este trabajo se estudiaron muestras de distintos aceites de patas de vacuno, de pollo, de pescado y de salvado de arroz. Fueron evaluadas como potenciales materias primas para la obtención de derivados para el curtido de cueros, en función de su comportamiento térmico (“Cold Test” y DSC, y su composición en ácidos grasos principales (GC. Algunos de los aceites estudiados aparecen como adecuados para dicho uso, mientras que otros podrían ser mejorados por fraccionamiento térmico.

  20. OBTENCIÓN DE ACEITE EPOXIDADO DE SEMILLA DE ALGODÓN UTILIZANDO UN ÁCIDO DÉBIL

    Directory of Open Access Journals (Sweden)

    Karina Cruz-Aldaco

    2015-01-01

    Full Text Available En este estudio se efectuó la evaluación de los parámetros que influyen en la modificación química, bajo condiciones suaves utilizando un ácido orgánico débil, de los ácidos grasos del aceite insaturado de semilla de algodón para producir aceite epoxidado, el cual es un precursor útil en la obtención de resinas epóxicas de importancia industrial. Fueron estudiados los siguientes parámetros de reacción: concentración de ácido acético, peróxido de hidrógeno, catalizador y disolvente, así como la temperatura, velocidad de agitación y tiempo de reacción. Los resultados mostraron que la agitación y la temperatura son los parámetros que más influyen sobre la modificación de los ácidos grasos insaturados. Las condiciones estudiadas permitieron obtener hasta un 70% de conversión relativa de oxígeno-oxirano del aceite de algodón.

  1. El aceite de pescado atenua las crisis convulsivas inducidas por hipertermia en ratas neonatas

    Directory of Open Access Journals (Sweden)

    Leopoldo E. Flores M.

    2008-01-01

    Full Text Available Un alto porcentaje (50-60% del cerebro en los mamíferos son principalmente grasas o lípidos, de éstos, el 35% son ácidos grasos esenciales, en particular los llamados omegas (O, como el Acido Docosahexanoico (DHA y el Eicosapentanoico (EPA llamados omega 3 (O-3. Diversos estudios han mostrado beneficios en la salud con la implementación de los O-3 como agentes terapéuticos en alteraciones cardiovasculares, renales, dérmicas, metabólicas, neurodegenerativas e inmunológicas. Evidencias experimentales sugieren un beneficio potencial del aceite de pescado (APE como neuroprotector debido al alto contenido de DHA y EPA. Sin embargo, es poco lo que se conoce en cuanto a los efectos que pudieran tener sobre alteraciones nerviosas, como las crisis convulsivas. En este contexto, se ha reportado que el tipo más común de trastorno epiléptico observado en los niños son las crisis convulsivas provocadas por fiebre (CF. La incidencia es de 3-5%, con ocurrencia entre los 5 meses y 5 años de edad, y se ha propuesto que esta alteración en la vida temprana pudiera tener efectos a largo plazo, manifestándose como un síndrome de epilepsia en la vida adulta. El objetivo del presente estudio fue evaluar el efecto del APE sobre las convulsiones inducidas por hipertermia experimental en un grupo de ratas Wistar macho de 5 días de edad (grupo SAPE cuyas madres consumieron una dieta base más un suplemento de APE (suministrado desde su infancia hasta la etapa de crianza. Este grupo se comparó con otro grupo de ratas de la misma edad y cepa (grupo SAPA cuyas madres consumieron una dieta base más un suplemento de aceite de palma (suministrado desde su infancia hasta la etapa de crianza, y con un tercer grupo de ratas (grupo CTRL cuyas madres consumieron la dieta base más agua bidestilada como suplemento. Las ratas tratadas con APE presentaron mayor resistencia a la elevación de la temperatura corporal inducida por la hipertermia, una menor frecuencia

  2. Análisis Químico de Mezclas Biodiesel de Aceite de Cocina Usado y Diesel por Espectroscopia Infrarroja Chemical Analysis of Mixtures of Biodiesel from Used Cooking Oil and Diesel by Infrared Spectroscopy

    OpenAIRE

    Jennifer J Lafont; Manuel S Páez; Yudi C Torres

    2011-01-01

    Se propone un método eficiente para determinar los porcentajes óptimos de mezclas biodiesel de aceite usado y diesel, para uso automotor. El procedimiento consiste en recolección del aceite usado, limpieza de residuos, y obtención del biodiesel mediante una reacción de transesterificación, con diferentes proporciones molares metanol/aceite . Las muestras fueron analizadas por espectroscopia infrarroja. Se encontró que una proporción metanol/aceite de 1:8 presentó mayor rendimiento en la obten...

  3. Coal Combustion Science

    Energy Technology Data Exchange (ETDEWEB)

    Hardesty, D.R. (ed.); Fletcher, T.H.; Hurt, R.H.; Baxter, L.L. (Sandia National Labs., Livermore, CA (United States))

    1991-08-01

    The objective of this activity is to support the Office of Fossil Energy in executing research on coal combustion science. This activity consists of basic research on coal combustion that supports both the Pittsburgh Energy Technology Center Direct Utilization Advanced Research and Technology Development Program, and the International Energy Agency Coal Combustion Science Project. Specific tasks for this activity include: (1) coal devolatilization - the objective of this risk is to characterize the physical and chemical processes that constitute the early devolatilization phase of coal combustion as a function of coal type, heating rate, particle size and temperature, and gas phase temperature and oxidizer concentration; (2) coal char combustion -the objective of this task is to characterize the physical and chemical processes involved during coal char combustion as a function of coal type, particle size and temperature, and gas phase temperature and oxygen concentration; (3) fate of mineral matter during coal combustion - the objective of this task is to establish a quantitative understanding of the mechanisms and rates of transformation, fragmentation, and deposition of mineral matter in coal combustion environments as a function of coal type, particle size and temperature, the initial forms and distribution of mineral species in the unreacted coal, and the local gas temperature and composition.

  4. Combustion of coffee husks

    Energy Technology Data Exchange (ETDEWEB)

    Saenger, M.; Hartge, E.-U.; Werther, J. [Technical Univ. Hamburg-Harburg, Chemical Engineering 1, Hamburg (Germany); Ogada, T.; Siagi, Z. [Moi Univ., Dept. of Production Engineering, Eldoret (Kenya)

    2001-05-01

    Combustion mechanisms of two types of coffee husks have been studied using single particle combustion techniques as well as combustion in a pilot-scale fluidized bed facility (FBC), 150 mm in diameter and 9 m high. Through measurements of weight-loss and particle temperatures, the processes of drying, devolatilization and combustion of coffee husks were studied. Axial temperature profiles in the FBC were also measured during stationary combustion conditions to analyse the location of volatile release and combustion as a function of fuel feeding mode. Finally the problems of ash sintering were analysed. The results showed that devolatilization of coffee husks (65-72% volatile matter, raw mass) starts at a low temperature range of 170-200degC and takes place rapidly. During fuel feeding using a non water-cooled system, pyrolysis of the husks took place in the feeder tube leading to blockage and non-uniform fuel flow. Measurements of axial temperature profiles showed that during under-bed feeding, the bed and freeboard temperatures were more or less the same, whereas for over-bed feeding, freeboard temperatures were much higher, indicating significant combustion of the volatiles in the freeboard. A major problem observed during the combustion of coffee husks was ash sintering and bed agglomeration. This is due to the low melting temperature of the ash, which is attributed to the high contents of K{sub 2}O (36-38%) of the coffee husks. (Author)

  5. Lectures on combustion theory

    Energy Technology Data Exchange (ETDEWEB)

    Burstein, S.Z.; Lax, P.D.; Sod, G.A. (eds.)

    1978-09-01

    Eleven lectures are presented on mathematical aspects of combustion: fluid dynamics, deflagrations and detonations, chemical kinetics, gas flows, combustion instability, flame spread above solids, spark ignition engines, burning rate of coal particles and hydrocarbon oxidation. Separate abstracts were prepared for three of the lectures. (DLC)

  6. Fifteenth combustion research conference

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1993-06-01

    The BES research efforts cover chemical reaction theory, experimental dynamics and spectroscopy, thermodynamics of combustion intermediates, chemical kinetics, reaction mechanisms, combustion diagnostics, and fluid dynamics and chemically reacting flows. 98 papers and abstracts are included. Separate abstracts were prepared for the papers.

  7. Strobes: An Oscillatory Combustion

    NARCIS (Netherlands)

    Corbel, J.M.L.; van Lingen, J.N.J.; Zevenbergen, J.F.; Gijzeman, O.L.J.; Meijerink, A.

    2012-01-01

    Strobe compositions belong to the class of solid combustions. They are mixtures of powdered ingredients. When ignited, the combustion front evolves in an oscillatory fashion, and flashes of light are produced by intermittence. They have fascinated many scientists since their discovery at the beginni

  8. Strobes: An oscillatory combustion

    NARCIS (Netherlands)

    Corbel, J.M.L.; Lingen, J.N.J. van; Zevenbergen, J.F.; Gijzeman, O.L.J.; Meijerink, A.

    2012-01-01

    Strobe compositions belong to the class of solid combustions. They are mixtures of powdered ingredients. When ignited, the combustion front evolves in an oscillatory fashion, and flashes of light are produced by intermittence. They have fascinated many scientists since their discovery at the beginni

  9. Estudio de la hidrogenación del aceite de jojoba

    Directory of Open Access Journals (Sweden)

    Pramparo, María C.

    2009-03-01

    Full Text Available Trials were cattied out on jojoba oil hydrogenation to study the effects of the main operative variable on iodine index and melting point. . A batch reactor with nickel catalysts was used. The effects selected for analysis were the reaction temperature, the operation pressure and the amount of catalyst.The range of temperature studied was 120-200ºC, the pressure was between 2 and 4 atm and the amount of catalyst ranged from 0.2 - 0.6% (percentage of catalyst mass over oil mass. The results showed that these three factors affected the reaction significantly; although temperature was the most influential in the progression of the reaction. In addition, the kinetic behavior was studied using a potential model of pseudo-first order and the corresponding kinetic parameters were obtained.Se han llevado a cabo ensayos de hidrogenación de aceite de jojoba para estudiar los efectos de las principales variables operativas de esta operación sobre el índice de yodo y el punto de fusión. Se utilizó un reactor discontinuo con un catalizador de níquel. Los efectos seleccionados para su análisis fueron la temperatura de reacción, la presión de operación y la cantidad de catalizador. El rango de temperaturas estudiado fue de 120-200ºC, el de presión entre 2 y 4 atm y la cantidad de catalizador entre 0,2-0,6 % (% masa catalizador / masa de aceite. Si bien los tres efectos estudiados fueron significativos, la temperatura fue el efecto que más influencia tuvo sobre el avance de la reacción. Se estudió además el comportamiento cinético mediante el ajuste de un modelo potencial de pseudo-primer orden, obteniéndose los parámetros cinéticos correspondientes.

  10. Caracterización del aceite de coquito de palma chilena (Jubaea chilensis

    Directory of Open Access Journals (Sweden)

    Torija, M. Esperanza

    2008-03-01

    Full Text Available The characteristics of the seeds from Chilean palm and the detailed composition of its fat are studied starting from 4 lots of seeds from the two regions being the major producers of Chilean palm seeds. From the proximate composition of the seeds a high content of fats is deduced with a mean value of 67.3%. The contents of proteins, carbohydrates and fibre were in the range of 7-11%. A detailed analysis of the fat indicates a high content of saturated fatty acids being capric, caprilic, lauric and miristic acids the major fatty acids. For this reason the presence of a high percentage of medium-chain triglycerides are detected in the triglyceride analysis. As for tocopherols, the fat contains low amounts of α-, γ- y δ-tocopherol with a total average of 84 mg/kg. Concerning phytosterols, the total content was around 1000 mg/kg being β-sitosterol and Δ7-estigmastenol the two major sterolsSe analizan las características generales del coquito de palma chilena y se estudia con detalle la composición de su aceite. Con este objetivo, se analizan 4 lotes de coquitos procedentes de las dos regiones de Chile donde existe mayor producción. La composición proximal del coquito indica un contenido muy mayoritario de grasa, con un promedio de 67,3% mientras los contenidos de proteínas, hidratos de carbono y fibra se encuentran entre el 7 y el 11%. Un análisis detallado de la grasa muestra un contenido elevado de ácidos grasos saturados (alrededor del 85% siendo los ácidos cáprico, caprílico, láurico y mirístico los que se encuentran en mayor concentración, lo que origina un elevado porcentaje de triglicéridos de cadena media. Respecto a los tocoferoles, el aceite contiene cantidades limitadas de α-, γ- y δ-tocoferol con un valor promedio total de 84 mg/kg, no detectándose la presencia de tocotrienoles. Respecto a los fitoesteroles, el contenido total es del orden de 1000 mg/kg siendo los esteroles mayoritarios el

  11. Ácidos grasos trans en aceites hidrogenados: implicaciones técnicas y nutricionales

    Directory of Open Access Journals (Sweden)

    Barrera-Arellano, D.

    1993-10-01

    Full Text Available Customers are increasingly paying attention to fats and oils because they are strongly health related. Many points are still confusing about this, but certainly there is one that will soon become public concern: the presence of trans fatty acids in hydrogenated fats and their products. Natural fats and oils from vegetable origin lack this trans isomers. Even though the production of the trans isomers during hydrogenation is unavoidable it can be controlled and minimized. The presence of these components modify technical characteristics as well as introduce problems and alterations in health and nutritional aspects. High trans fatty acids values (up 62% were found in Brazilian products. A relevant effect in solid content (SFC at low temperatures was observed but no influence in the softening point. Possible nutritional and health effects related to trans fatty acids will be discussed.

    Actualmente, las grasas y aceites son alimentos observados con mucha atención por los consumidores, por su estrecha relación entre ellos y la salud. Uno de los puntos todavía confusos y que ciertamente vendrá rápidamente a tornarse de dominio público, es la presencia de ácidos grasos trans en grasas hidrogenadas y productos que las contienen. En aceites y grasas de origen vegetal estos isómeros trans están ausentes, y son producidos durante la hidrogenación, este fenómeno es inevitable, pero puede ser controlado y minimizado. La presencia de estos compuestos modifican tanto las características técnicas como también, se sospecha ocasionan problemas y alteraciones desde el punto de vista nutricional y de salud. En productos hidrogenados brasileños fueron encontrados valores elevados de ácidos trans (hasta 62%, observándose un efecto notable en el contenido de sólidos (SFC a bajas temperaturas y ninguna influencia en el punto de reblandecimiento «softening point». Posibles efectos nutricionales y de salud relacionados con ácidos grasos trans

  12. Internal combustion engine

    Energy Technology Data Exchange (ETDEWEB)

    Helmich, M.J.; Hoagland, M.C.; Hubbard, R.L.; Schaub, F.S.

    1981-12-22

    A method of combusting natural gas fuel in a two cycle, turbocharged internal combustion engine substantially reduces the production of nitrogen-oxygen emissions. An improved turbocharger design provides increased air charging pressure, produces a controlled lean air/fuel mixture and lowers peak combustion temperatures. A jet cell ignition device ensures uniform, reliable ignition of the lean air/fuel mixture under all operating conditions and the lean air/fuel mixture in turn encourages complete fuel combustion and provides excellent combustion characteristics with methane, ethane and heavier paraffinic hydrocarbon fuels. These structural modifications and adjustment of other operating parameters combine to reduce nitric oxide (NO) and nitrogen dioxide (NO/sub 2/) emissions by as much as 75% while effecting only a negligible increase in fuel consumption.

  13. Trace gas emissions from combustion of peat, crop residue, domestic biofuels, grasses, and other fuels: configuration and Fourier transform infrared (FTIR) component of the fourth Fire Lab at Missoula Experiment (FLAME-4)

    Science.gov (United States)

    Stockwell, C. E.; Yokelson, R. J.; Kreidenweis, S. M.; Robinson, A. L.; DeMott, P. J.; Sullivan, R. C.; Reardon, J.; Ryan, K. C.; Griffith, D. W. T.; Stevens, L.

    2014-09-01

    During the fourth Fire Lab at Missoula Experiment (FLAME-4, October-November 2012) a large variety of regionally and globally significant biomass fuels was burned at the US Forest Service Fire Sciences Laboratory in Missoula, Montana. The particle emissions were characterized by an extensive suite of instrumentation that measured aerosol chemistry, size distribution, optical properties, and cloud-nucleating properties. The trace gas measurements included high-resolution mass spectrometry, one- and two-dimensional gas chromatography, and open-path Fourier transform infrared (OP-FTIR) spectroscopy. This paper summarizes the overall experimental design for FLAME-4 - including the fuel properties, the nature of the burn simulations, and the instrumentation employed - and then focuses on the OP-FTIR results. The OP-FTIR was used to measure the initial emissions of 20 trace gases: CO2, CO, CH4, C2H2, C2H4, C3H6, HCHO, HCOOH, CH3OH, CH3COOH, glycolaldehyde, furan, H2O, NO, NO2, HONO, NH3, HCN, HCl, and SO2. These species include most of the major trace gases emitted by biomass burning, and for several of these compounds, this is the first time their emissions are reported for important fuel types. The main fire types included African grasses, Asian rice straw, cooking fires (open (three-stone), rocket, and gasifier stoves), Indonesian and extratropical peat, temperate and boreal coniferous canopy fuels, US crop residue, shredded tires, and trash. Comparisons of the OP-FTIR emission factors (EFs) and emission ratios (ERs) to field measurements of biomass burning verify that the large body of FLAME-4 results can be used to enhance the understanding of global biomass burning and its representation in atmospheric chemistry models. Crop residue fires are widespread globally and account for the most burned area in the US, but their emissions were previously poorly characterized. Extensive results are presented for burning rice and wheat straw: two major global crop residues

  14. Características fisicoquímicas del aceite del endospermo de la Palma Yagua (Attalea cryptanther

    Directory of Open Access Journals (Sweden)

    Linares, Oscar

    2006-09-01

    Full Text Available In this research, the physicochemical characteristics of the yagua palm (Attalea cryptanther endospermus oil were evaluated. Seeds of mature fruits from Santa Ana hill, Canoabo, Bejuma municipality, Carabobo state-Venezuela, harvested in November 2003, were decorticated and the endospermus was transformed to meal by means of grinding. The oil from meal was extracted with n-hexane using Soxhlet equipment. Yagua endospermus crude oil showed the following characteristics: iodine index 13.77 cg I2/g; refraction index 1.4441 at 60 ºC; saponification value 233 mg KOH/g; peroxide value 0.20 meq O2/kg; unsaponifiable matter 0.97 %; AOM stability 31 h; solid fat content 54 % at 10 ºC and 10 % at 20 ºC; Lovibond color: R 3.2 and Y 1.3. The major fatty acids were lauric acid (58 % and miristic acid (16.5 %.Yagua endospermus is an alternative oleaginousEl objetivo de esta investigación fue caracterizar físicoquímicamente el aceite de la palma Yagua (Attalea cryptanther. El endospermo de frutos maduros procedentes del cerro Santa Ana, Canoabo, municipio Bejuma, estado Carabobo Venezuela, pertenecientes a la cosecha Noviembre 2003, fueron transformados en harina mediante molienda. Una vez obtenida la harina se procedió a la extracción del aceite mediante un equipo Soxhlet utilizando como solvente n-Hexano. El aceite crudo extraído fue caracterizado mediante normas COVENIN y AOCS. Se determinaron valores de índice de yodo de 13,77 cg I2/g, índice de refracción 1,4441 a 60 °C, índice de saponificación 233mg KOH/g, índice de peroxido 0,20 meq O2/Kg, materia insaponificable 0,97%, estabilidad AOM (31 horas, contenido de grasa sólida (54% a 10 °C y 10% a 20 °C, color (R: 3,2- A: 1,3-A: 0. Los ácidos grasos mayoritarios encontrados fueron el ácido laurico (58% y el ácido miristico (16,5%. El endospermo evaluado es una alternativa como materia prima para la obtención de aceite ya que presenta características similares al aceite de coco y

  15. “Bio” combustibles o el mito del oro verde ¿Política ambiental, “exportación de naturaleza”, o etnocidio?

    OpenAIRE

    Anne-Lise Naizot

    2013-01-01

    El término “biocombustible” se refiere en su aceptación general a los combustibles que pueden ser obtenidos a partir de biomasa, de leña, y de más de 14 variedades de cultivos (caña de azúcar, soya, palma aceitera, ricino, maíz, colza, girasol, sorgo, trigo, mandioca, etc.). Los dos “biocombustibles”, “bio”etanol y “bio”diesel, son obtenidos, respectivamente, por fermentación de productos ricos en azúcares, almidones o celulosas (bioetanol) y de aceites vegetales como la palma africana, giras...

  16. Experimental facility for analysis of biomass combustion characteristics

    Directory of Open Access Journals (Sweden)

    Miljković Biljana M.

    2015-01-01

    Full Text Available The objective of the present article is to present an experimental facility which was designed and built at the Faculty of Technical Sciences in order to study the combustion of different sorts of biomass and municipal solid waste. Despite its apparent simplicity, direct combustion is a complex process from a technological point of view. Conventional combustion equipment is not designed for burning agricultural residues. Devices for agricultural waste combustion are still in the development phase, which means that adequate design solution is presently not available at the world market. In order to construct a boiler and achieve optimal combustion conditions, it is necessary to develop a mathematical model for biomass combustion. Experimental facility can be used for the collection of data necessary for detailed modelling of real grate combustor of solid biomass fuels. Due to the complexity of the grate combustion process, its mathematical models and simulation software tools must be developed and verified using experimental data. This work highlights the properties required for the laboratory facility designed for the examination of biomass combustion and discusses design and operational issues.

  17. Evaluación de la calidad del aceite de once semillas de leguminosas del desierto sonorense

    Directory of Open Access Journals (Sweden)

    Ortega-Nieblas, M.

    1996-06-01

    Full Text Available In order to generate information that lead to an efficient and diversifícate use of the natural resources that the Sonoran Desert offers, as it is the great variety of Leguminosae or Fabaceae plants, oils from seeds or Prosopis chilensis, Prosopis velutina (mezquite, Cercidium floridium (palo azul, Cercidium praecox (palo de brea, Acacia constricta (vinorama, Acacia cymbyspina (chirahui, Acacia occidentalis (tesota, Acacia mcmurphy (tepehuaje, Desmanthus palmeri (mezquitillo, Caesalpinia caladenia (palo dorado, and Caesalpinia pumila (palo piojo were analyzed. The oils were extracted from each seed with hexane, and their physicochemical characteristics were evaluated. The oil content varied from 9 to 16% in the different seeds. Their indexes of acidity, peroxides and free fatty acid content were low and within the accepted values. Fatty acids separated by gas chromatography predominating indicate the oleic and linoleic. All analyzed crude oils were of good quality, comparable to commercial and oils of wild legume seeds from the same region.

    A fin de generar información que conduzca a un uso eficiente y diversificado de los recursos naturales que ofrece el Desierto Sonorense, como es la gran variedad de plantas de la familia Leguminosae ó Fabaceae, se analizaron los aceites de las semillas: Prosopis chilensis, Prosopis velutina (mezquite, (palo azul, Cercidium praecox (palo de brea, Acacia constricta (vinorama, Acacia cymbyspina (chirahui, Acacia occidentalis (tésota, Acacia mcmurphy (tepeguaje, Desmanthus palmeri (mezquitillo, Caesalpinia caladenia (palo dorado, y Caesalpinia pumila (palo piojo. Los aceites de cada semilla fueron extraídos con hexano, se evaluaron las características fisico-químicas de calidad y la cuantificación de ácidos grasos por cromatografía de gases. El contenido de

  18. Combustion en lit fluidisé Fluidized-Bed Combustion

    Directory of Open Access Journals (Sweden)

    Chrysostome G.

    2006-11-01

    Full Text Available Après quelques rappels généraux sur la fluidisation où seront présentés en par-ticulier les avantages qu'elle offre en combustion, on exposera l'état actuel du développement des générateurs à lit fluidisé opérant avec les combustibles suivants : charbon, combustibles pétroliers, résidus divers ; il sera fait mention de la contribution de l'Institut Français du Pétrole (IFP dans les deux derniers domaines.On présentera ensuite les installations les plus récentes en traitement de minerais (grillage des sulfures, calcination de calcaires. En raison de son importance on examinera encore les possibilités de désulfuration au sein de lits fluidisés, de même que seront commentés les travaux de régénération des absorbants.On terminera enfin en mentionnant les développements des lits circulants ou rapides, considérés comme les réacteurs de la seconde génération. After a general review of fluidization including in particular the advantages it offers for combustion, this article describes the present state of the development of fluidized-bed gcnerators operating with the following fuels : cool, petroleum fuels, different residues. Mention is made of Institut Français du Pétrole (IFP contribution in the last two fields. Then the most recent ore-treating installations are described (roasting of sulfides, calcination of limestones. Because of its importance, the possibilities of desulfurizoticn inside fluidized beds is examined, and research on the regeneration of absorbants is commented on. The article ends by mentioning the development of circulating or fast beds which are considered as second generation reactors.

  19. Efecto de diferentes niveles de aceites esenciales de Lippia origanoides kunth en pollos de engorde

    Directory of Open Access Journals (Sweden)

    Liliana Betancourt L.

    2012-08-01

    Full Text Available Objetivo. Determinar el nivel de inclusión de aceite esencial de Lippia origanoides Kunth (AEO que maximice el peso corporal y la eficiencia económica. Materiales y métodos. Los AEO se obtuvieron por hidrodestilación y se analizaron por GC/MS. Se evaluaron cuatro niveles, 0, 100, 200 y 300 ppm de AEO en dos grupos de pollos; un grupo retado con ooquistes atenuados de coccidia y otro no retado. El nivel óptimo de inclusión fue estimado mediante una función sinusoidal. Resultados. La suplementación con 100 ppm de AEO redujo el impacto negativo del reto con ooquistes atenuados de coccidia sobre el peso corporal, 1.799, 1.889 y 1.995 g en los grupos retado sin AEO, retado + AEO y control, respectivamente (p<0.001. Se encontró una interacción significativa entre la suplementación con AEO y reto sobre el peso corporal y la conversión de alimento (p<0.05. El nivel de AEO que maximiza el peso corporal en los grupos de pollos no retados fue 65 ppm; mientras que para los grupos retados fue 147 ppm. Conclusiones. Se demostró que los AEO ricos en timol pueden ser un aditivo natural viable para la producción de carne de pollo.

  20. REMEDIACIÓN DE SUELOS CONTAMINADOS CON ACEITE DE MOTOR MEDIANTE TENSIOACTIVOS ALTAMENTE BIODEGRADABLES

    Directory of Open Access Journals (Sweden)

    Ignacio Moya-Ramírez

    2014-01-01

    Full Text Available En el presente trabajo se ha estudiado el proceso de remediación de un suelo arenoso contaminado con aceite de motor, empleando dos sistemas de lavado, uno discontinuo y otro continuo. Además se evaluó la capacidad de tres surfactantes altamente biodegradables, dos sintéticos (Glucopon 600 y Findet 1214N/23 y un biosurfactante producido por Bacillus subtilis, para facilitar la eliminación del contaminante. Los resultados obtenidos con el sistema continuo fueron mejores en todos los casos a los del discontinuo, incluso con agua destilada como solución de lavado. Tanto la incorporación de los tensioactivos como el aumento de la temperatura incrementaron significativamente la remoción del contaminante en ensayos realizados con el sistema discontinuo, destacando los buenos resultados obtenidos con el biosurfactante a concentraciones próximas a la CMC. En el sistema continuo la concentración de tensioactivo no resultó tan determinante para la eliminación del contaminante , al menos por debajo de la CMC.

  1. CURADO NO-ISOTERMICO DE MEZCLAS EPOXI-ACEITE DE SOJA EPOXIDADO-ANHÍDRIDO

    Directory of Open Access Journals (Sweden)

    Facundo I. Altuna

    2011-01-01

    Full Text Available Se estudió la cinética de curado no-isotérmico de mezclas de diglicidil éter de bisfenol A (DGEBA con aceite de soja epoxidado (ESO utilizando anhídrido metiltetrahidroftálico (MTHPA como agente de curado y 1-metil imidazol (1MI como iniciador. El sistema ESO/MTHPA exhibió valores de entalpía de reacción menores y temperaturas de pico exotérmico mayores que el sistema DGEBA/MTHPA debido a la menor reactividad de los grupos oxirano internos del ESO. Los parámetros cinéticos de los sistemas puros DGEBA/MTHPA y ESO/MTHPA se obtuvieron a partir de los datos calorimétricos mediante un análisis de regresión multiparamétrica utilizando un modelo cinético fenomenológico. La cinética de los sistemas puros fue utilizada para predecir la de las mezclas considerando las interacciones entre DGEBA y ESO. El modelo propuesto permitió predecir adecuadamente la cinética del proceso de curado utilizando parámetros independientes de la velocidad de calentamiento y de aplicación directa en el campo de procesamiento de estos materiales.

  2. Estudios químicos y moleculares de jatrophas de Sonora como fuente potencial de aceites

    Directory of Open Access Journals (Sweden)

    Luis Ángel Medina Juárez

    2015-12-01

    Full Text Available Las plantas del género Jatropha, pertenecientes a la familia de las Euphorbiaceae, pueden ser consideradas como alternativa para la obtención de semilla, con uso potencial en la fabricación de biocombustibles por su contenido alto de aceite. Se conocen alrededor de 186 especies distribuidas alrededor del mundo, de las cuales 48 se encuentran en México. En Sonora se conocen principalmente las especies de Jatropha cardiophylla, Jatropha cordata, Jatropha cinerea y Jatropha cuneata. La información que se tiene hasta el momento para especies adaptadas a zonas áridas en cuanto a la composición química de sus semillas es escasa y se desconoce el aspecto molecular relacionado con la síntesis de ácidos grasos. Por tal razón, se ha iniciado el estudio de la composición química y su relación con la expresión de genes, involucrados en la síntesis de ácidos grasos específicamente de los ácidos oleico y linoleico en las semillas de las especies de Jatropha nativas de Sonora.

  3. Características físico-químicas y composición de ácidos grasos del aceite crudo extraído de residuos de mora (Rubus glaucus Benth

    Directory of Open Access Journals (Sweden)

    Moreno-Álvarez, Mario José

    2003-09-01

    Full Text Available In this research the physicochemical characteristics and fatty acids composition of oil extracted from blackberry (Rubus glaucus Benth residue were determined. Mature fruits from ‘‘La Colonia Tovar’’, Aragua state, Venezuela harvested on April 2001, were processed to obtain seeds and residues of pulp. This residue was extracted with n-hexane (Soxhlet method. The crude oil was assayed by means of COVENIN and AOCS methods. The results showed: Iodine index 160.16 cg I2/g, refraction index to 25ºC 1.4780 , saponification value 193.76 mg K0H/g, peroxide value 30.40 meq 02/kg, free fatty acidity 2.83% (oleic acid, insaponifiable value 2.77%, phosphorus content 0.22% and stability 3.09 h (AOM. The major fatty acids found were oleic acid (55.39% and linoleic acid (29.51%.El objetivo de esta investigación fue caracterizar físico-químicamente el aceite extraído de residuos de mora (Rubus glaucus Benth y determinar su composición de ácidos grasos. Frutos maduros procedentes de ‘‘La Colonia Tovar’’, estado Aragua, Venezuela perteneciente a la cosecha Abril 2001, fueron procesados para obtener residuos constituidos por semillas y restos de pulpa. Los residuos fueron sometidos a un proceso de extracción mediante equipo Soxhlet utilizando como solvente n-hexano. El aceite crudo extraído fue caracterizado mediante normas COVENIN y AOCS. Se determinaron valores de índice de Iodo 160,16 cg I2/g; índice de refracción 1,4780 a 25ºC; índice de saponificación 193,76 mg KOH/g; índice de peróxidos 30,40 meq O2/kg; acidez libre oleica 2,83 %; materia insaponificable 2,77 %; fósforo 0,22 % y estabilidad AOM de 3,09 horas. Los ácidos grasos mayoritarios encontrados fueron el ácido oleico (55,39% y el ácido linoleico (29,51%.

  4. Sandia Combustion Research: Technical review

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1995-07-01

    This report contains reports from research programs conducted at the Sandia Combustion Research Facility. Research is presented under the following topics: laser based diagnostics; combustion chemistry; reacting flow; combustion in engines and commercial burners; coal combustion; and industrial processing. Individual projects were processed separately for entry onto the DOE databases.

  5. Experimental investigation on the combustion characteristics of aluminum in air

    Science.gov (United States)

    Feng, Yunchao; Xia, Zhixun; Huang, Liya; Yan, Xiaoting

    2016-12-01

    With the aim of revealing the detailed process of aluminum combustion in air, this paper reports an experimental study on the combustion of aluminum droplets. In this work, the aluminum wires were exposed and heated by a CO2 laser to produce aluminum droplets, and then these droplets were ignited and burnt in air. The changing processes of aluminum wires, droplets and flames were directly recorded by a high-speed camera, which was equipped with a high magnification zoom lens. Meanwhile, the spectrum distribution of the flame was also registered by an optical spectrometer. Besides, burning residuals were collected and analyzed by the methods of Scanning Electron Microscopy (SEM) and Energy Dispersive Spectrometer (EDS). Experimental results show that, during combustion, the aluminum droplet is covered by a spherical vapor-phase flame, and the diameter of this flame is about 1.4 times of the droplet diameter, statistically. In the later stages of combustion, the molten aluminum and condensed oxide products can react to generate gaseous Al and Al2O spontaneously. Little holes are found on the surface of residuals, which are the transport channels of gaseous products, namely the gaseous Al and Al2O. The combustion residuals are consisted by lots of aluminum oxide particles with diameters less than 1 μm.

  6. Fluidized coal combustion

    Science.gov (United States)

    Moynihan, P. I.; Young, D. L.

    1979-01-01

    Fluidized-bed coal combustion process, in which pulverized coal and limestone are burned in presence of forced air, may lead to efficient, reliable boilers with low sulfur dioxide and nitrogen dioxide emissions.

  7. Improving combustion efficiency

    Energy Technology Data Exchange (ETDEWEB)

    Bulsari, A.; Wemberg, A.; Multas, A. [Nonlinear Solutions Oy (Finland)

    2009-06-15

    The paper describes how nonlinear models are used to improve the efficiency of coal combustion while keeping NOx and other emissions under desired limits in the Naantali 2 boiler of Fortum Power and Heat Oy. 16 refs., 6 figs.

  8. Desodorización de aceite de pescado mediante destilación a alto vacío: preservación de las características químicas del aceite

    Directory of Open Access Journals (Sweden)

    Nieto, S.

    1993-02-01

    Full Text Available The construction and the operation conditions of a high vacuum glass-equipment for deodorizing sardine oil at laboratory scale is described. The equipment working at 120°C and at a pressure of 0.05-0.1 mmHg maintains unchanged the n-3 fatty acid composition of the oil producing a considerable reduction in the cholesterol and peroxide content of the oil. The stripper, having a throughput of 1500-1800 mL/hr, allows the obtaining of a high quality fish oil suitable for experimental and for pharmacological and/or nutritional applications.

    Se describe la construcción y condiciones de operación de un destilador de vidrio de alto vacío que permite, a escala de laboratorio, la desodorización del aceite de sardina española. El equipo operando a temperaturas no superiores a 120°C y a una presión constante de 0,05-0,1 mmHg no altera la composición de ácidos grasos n-3 del aceite y permite una disminución considerable del colesterol y de los peróxidos orgánicos. La destilación permite obtener un aceite de alta calidad con un rendimiento de 1500-1800 mL/hr que puede ser utilizado para fines experimentales o para uso farmacológico y/o nutricional.

  9. Scramjet Combustion Processes

    Science.gov (United States)

    2010-09-01

    plan for these flights is as follows: Scramjet Combustion Processes RTO-EN-AVT-185 11 - 21 HyShot 5 – A Free-Flying Hypersonic Glider HyShot...5 will be a hypersonic glider designed to fly at Mach 8. It will separate from its rocket booster in space and perform controlled manoeuvres as it...RTO-EN-AVT-185 11 - 1 Scramjet Combustion Processes Michael Smart and Ray Stalker Centre for Hypersonics The University of Queensland

  10. Fluidized bed combustion and its application to refused fuels. Combustion en leche fluido y su aplicacion a combustibles residuales

    Energy Technology Data Exchange (ETDEWEB)

    Euba, J.

    1994-01-01

    As a consequence of the energetic crisis produced in th 70's it was proposed to find new power supplies and it also was the start of the use of traditional energy, which up to that date had not been profitable. At the same time, the worry about the pollutant emissions to the environment was increasing and finally it was approved a new legislation on atmosphere pollution, which is the Directive of the European community Council of 24th November 1988. Under these circumstances there are very important the new technologies for the supply of residual combustion with low values of pollution, where it is very important the combustion in fluidized bed. (Author)

  11. Sandia Combustion Research Program

    Energy Technology Data Exchange (ETDEWEB)

    Johnston, S.C.; Palmer, R.E.; Montana, C.A. (eds.)

    1988-01-01

    During the late 1970s, in response to a national energy crisis, Sandia proposed to the US Department of Energy (DOE) a new, ambitious program in combustion research. Shortly thereafter, the Combustion Research Facility (CRF) was established at Sandia's Livermore location. Designated a ''user facility,'' the charter of the CRF was to develop and maintain special-purpose resources to support a nationwide initiative-involving US inventories, industry, and national laboratories--to improve our understanding and control of combustion. This report includes descriptions several research projects which have been simulated by working groups and involve the on-site participation of industry scientists. DOE's Industry Technology Fellowship program, supported through the Office of Energy Research, has been instrumental in the success of some of these joint efforts. The remainder of this report presents results of calendar year 1988, separated thematically into eleven categories. Referred journal articles appearing in print during 1988 and selected other publications are included at the end of Section 11. Our traditional'' research activities--combustion chemistry, reacting flows, diagnostics, engine and coal combustion--have been supplemented by a new effort aimed at understanding combustion-related issues in the management of toxic and hazardous materials.

  12. Effect of CO Combustion Promoters on Combustion Air Partition in FCC under Nearly Complete Combustion

    Institute of Scientific and Technical Information of China (English)

    王锐; 罗雄麟; 许锋

    2014-01-01

    With CO combustion promoters, the role of combustion air flow rate for concerns of economics and control is important. The combustion air is conceptually divided to three parts:the air consumed by coke burning, the air consumed by CO combustion and the air unreacted. A mathematical model of a fluid catalytic cracking (FCC) unit, which includes a quantitative correlation of CO heterogeneous combustion and the amount of CO combustion promoters, is introduced to investigate the effects of promoters on the three parts of combustion air. The results show that the air consumed by coke burning is almost linear to combustion air flow rate, while the air consumed by CO combustion promoters tends to saturate as combustion air flow rate increases, indicating that higher air flow rate can only be used as a manipulated variable to control the oxygen content for an economic concern.

  13. Composición en ácidos grasos de los aceites de semillas de especies mediterráneas

    Directory of Open Access Journals (Sweden)

    Gamisans, J.

    1994-06-01

    Full Text Available In the context of research into the lipids of higher plant, the fatty acid composition of eleven species is reported. These species belong to nine families, and most of them are common in the Mediterranean flora.
    Oils from some plants (Arctium tomentosum, Hypericum perforatum, Linaria vulgaris. Pulicaria dysenterica, Smilax áspera were partially hydrolyzed, and contained free fatty acids. Arctium tomentosum seed oil and, to a lesser extent, Smilax áspera seed oil, showed a trans absorption band in their IR spectra. Small quantities of waxes were present in Pulicaria dysenterica and Silybum marianum seed oil.
    The fatty acid composition of the oils from these plants approaches levels found in food oils as well as industrial oils. Three species showed high levels of their predominant fatty acid: Alliaria petiolata (erucic acid, 41.5%, Linaria vulgaris and Pulicaria dysenterica (linoleic acid, 70 and 72% respectively. In the seed oil of Arctium tomentosum four fatty acids were not identified: one of them could be 3(t, 9(c, 12(c- octadecatrienoic acid. But the most complex composition was that of Atriplex hortensis oil, which contained thirty three fatty acids, of which fifteen were unknown.

    En el marco de investigaciones sobre los lípidos de las plantas superiores, se presenta la composición en ácidos grasos de once especies. Estas especies pertenecen a nueve familias diferentes y la mayoría son frecuentes en la flora mediterránea.
    Numerosos aceites (Arctium tomentosum, Hypericum perforatum,Linaria vulgaris, Pulicaria dysenterica y Smilax áspera contienen glicéridos parciales y ácidos grasos libres. El aceite de Arctium tomentosum, y en menor grado, el de Smilax áspera muestran una banda espectral trans en espectrometría IR. En los aceites de Pulicaria dysenterica y de Silybum marianum peque

  14. Efecto catalítico de metales sobre la estabilidad térmica de aceites de oliva

    Directory of Open Access Journals (Sweden)

    Molero Meneses, M.

    2001-12-01

    Full Text Available The catalytic effect at homogenous phase of several metals on the thermal stability of olive oils of different characteristics has been studied. Samples were prepared by dissolution of suitable amounts of organo-metallic compounds in the oils, to obtain concentrations of metal between 0–30 ppm. The compounds organo-metallic were: ferrocene (Fe-II, dibutyltin diacetate (Sn-II, copper acetylacetonate (Cu-II and lead acetate (Pb-IV. The study was carried out by applying thermal analysis techniques: thermogravimetry (TG and derivative thermogravimetry (DTG. The obtained results show that the degradation rate of the oil is always higher in the presence of metals and its value is as greater as higher is concentrations. On the other hand, the kinetic parameters of the thermodegradation reaction of the oil, activation energy a n d f requency factor, w ere deter mined from thermogravimetric data. The obtained values for both parameters confirm the negative influence of the tested metals on the oil thermal stability. This effect is more evident for lead, followed of iron and tin and finally copper. Likewise, the results of thermal analysis allow to define the order of thermal stability of oils of different origins and refined grades.Se estudia el efecto catalítico en fase homogénea de diversos metales sobre la estabilidad térmica de aceites de oliva de distintas características. Las muestras a analizar se prepararon disolviendo en los aceites las cantidades adecuadas de los metales en forma de compuestos organometálicos, en el intervalo de concentraciones comprendido entre 0-30 ppm. Dichos compuestos fueron: ferroceno (Fe-II, acetilacetonato de cobre (Cu-II, acetato de plomo (Pb-IV y diacetato de dibutil estaño (Sn-II. El estudio se llevó a cabo mediante las técnicas de análisis térmico, termogravimetría (TG y termogravimetría derivada (TGD. Los resultados obtenidos muestran que, en todos los casos, la velocidad de degradación del aceite

  15. Comportamiento reológico dinámico de mayonesas comerciales: influencia de la temperatura y del contenido en aceite

    Directory of Open Access Journals (Sweden)

    Berjano, M.

    1991-10-01

    Full Text Available The linear dynamic viscoelasticity of two commercial foodstuffs, oil in water emulsions with very different oil contents, has been studied. Temperature ranged between 10 and 40°C. From the experimental results it can be deduced that less oil content produces a significant decrease in the linear viscoelastic functions, as well as an enhanced temperature sensitivity.

    Se estudia el comportamiento viscoelástico dinámico, en zona lineal, de dos productos comerciales que son emulsiones alimentarias aceite en agua, o/w, con un contenido en aceite muy distinto. El intervalo de temperatura estudiado ha variado entre 10 y 40°C. De los resultados obtenidos se deduce que un menor contenido en aceite produce una disminución significativa de todas las funciones viscoelásticas, así como una mayor influencia del efecto de la temperatura.

  16. Obtención del aceite de las semillas de luffa cylindrica y evaluación de su potencial uso en la industria cosmética

    OpenAIRE

    2007-01-01

    Se realizó la extracción y caracterización fisicoquímica y microbiológica del aceite de las semillas de Luffa cilíndrica procedentes del departamento de Risaralda. Las propiedades físicas y químicas evaluadas se encontraron dentro de los parámetros establecidos por la normatividad Colombiana para aceites de uso cosmético. Según el análisis cromatográfico, el aceite presentó una composición de ácidos grasos enriquecida en oléico, linoléico, palmítico y esteárico. En la caracterización micro...

  17. Efecto de la suplementación de L-arginina y aceite de pescado en el comportamiento reproductivo de ovejas de pelo

    OpenAIRE

    Bulbarela García, Gerónimo Fermín

    2012-01-01

    El objetivo del estudio fue evaluar el efecto de la suplementación de L-arginina (ARG) y aceite de pescado (AP) en el tiempo de respuesta (TR), porcentaje de estros (PE), tasa ovulatoria (TO), porcentaje de gestión (PG) y prolificidad (PR). Los trámites fueron: P. Progestágeno (n=7), PMSG. AFG + PMSG (Gonadotropina Sérica de Yegua Preñada) 400 UI (n=15), ARG. AFG +L-argimina 300 mg kg1 (n=17), ARGAP. AFG + L-argimina 300 mg kg1 más aceite de pescado 6 % (n=16) y AP. AFG + aceite de pescado 6%...

  18. Frutales y agroindustria: conservas, aceites y maderas (Chile y Cuyo, 1550-1850

    Directory of Open Access Journals (Sweden)

    Lacoste, Pablo

    2011-12-01

    Full Text Available The rapid propagation of European fruit-bearing plants in Chile and Cuyo led to the problem of their exploitation, which was a complex issue in the period before the availability of means of refrigeration. The response was to encourage agro-industrial activity. Some fruits were conserved through a process of dehydration and others were used in the making of oils. Some of these products were commercialised on the domestic market and others were exported, especially to Peru. There was also an improved use of the timber from fruit trees in both the construction industry and carpentry and cabinet-making. These activities ensured the economic viability of fruit-growing and made it possible for it to expand in the region under analysis.

    La rápida propagación de plantas frutales europeas en Chile y Cuyo formuló el problema de su aprovechamiento, asunto complejo antes de la disponibilidad de medios de refrigeración. La respuesta fue el impulso a la actividad agroindustrial. Algunos frutas se conservaban mediante deshidratación, otras se usaban para elaboraban aceites. Algunos de estos productos se comercializaban en el mercado interno y otros se exportaban, particularmente al Perú. Además se avanzó en el aprovechamiento de frutales tanto para construcción como en carpintería y ebanistería. Estas actividades aseguraron la viabilidad económica de la fruticultura e hicieron posible su expansión en la región estudiada.

  19. Influencia de la producción integrada del olivar sobre la calidad del aceite de oliva virgen

    Directory of Open Access Journals (Sweden)

    Gutiérrez-Rosales, F.

    2006-12-01

    Full Text Available A study has been conducted to determine the influence of integrated olive production on the quality of extra virgin olive oil. On two different dates, samples from three different holdings were taken in integrated production (I parcels, and in conventional production (C parcels, both adjacent. The analytical determinations were free acidity, peroxide value, K232 and K270, fatty acid composition, esterols, phenolic compounds, tocopherols, stability to oxidation and sensory analysis. Most interesting among the results obtained were total contents of esterols and tocopherols, higher in olive oils of integrated production.Se ha realizado un estudio para ver la influencia de la producción integrada del olivar sobre la calidad del aceite de oliva virgen. Se tomaron muestras de aceitunas de tres fincas distintas, en parcelas correspondientes a olivar de secano, de producción integrada (I, y en parcelas adyacentes a estas de producción convencional (C, en dos fechas diferentes. Las determinaciones analíticas realizadas han sido acidez libre, índice de peróxidos, K232 y K270, composición de ácidos grasos, esteroles, compuestos fenólicos, tocoferoles, estabilidad oxidativa y análisis sensorial. En los resultados obtenidos destaca que los valores más altos de esteroles totales y tocoferoles corresponden a los aceites de producción integrada. Así mismo, los aceites de producción convencional presentan mayor contenido de fenoles totales y parecen ofrecer mayor estabilidad.

  20. Diagramas de equilibrio para la extracción con solvente de aceite e insecticida de semilla molida de nim

    Directory of Open Access Journals (Sweden)

    R. Espinosa

    2006-01-01

    Full Text Available En este trabajo se construyeron diagramas de equilibrio para la extracción con hexano de aceite de la semilla molida de nim (GNSK y de la extracción posterior con etanol de insecticida de la GNSK sin aceite. Los datos experimentales fueron obtenidos a diferentes temperaturas, poniendo en contacto sólido y solvente en diferentes proporciones en frascos Erlenmeyer. Se suministró agitación y se mantuvo la temperatura controlada hasta alcanzar el equilibrio. La composición del extracto y del refinado se determinó separando los solventes por evaporación. Se propone ecuaciones para la curva de refinado y la curva de distribución. En ambas extracciones, la fracción de solución retenida dentro de la estructura celular del sólido molido aumenta con la temperatura. La concentración del extracto tiene más influencia en la cantidad de solución retenida para la extracción de insecticida que para la extracción de aceite. Para extractos diluidos, la concentración de soluto tiende a ser mayor en el extracto que en la solución retenida. Esta tendencia es más pronunciada cuando la temperatura aumenta. A temperaturas cercanas al punto de ebullición, hay mayor tendencia a la retención de solvente por el sólido, a cualquier concentración.

  1. Use of solid residue from the olive industry

    Directory of Open Access Journals (Sweden)

    Guinda, Ángeles

    2006-03-01

    Full Text Available Research into finding new uses for olive products, particularly by-products of olive oil production, is of great relevance not only to the economy, but also to the environment, in the towns where olives are grown. A large number of research articles has been published dealing with the chemical composition of olives and olive oil; however, only a few studies have centered on isolating and identifying compounds in the olive leaf. In this article an overview of the present body of knowledge on the chemical composition of the olive leaf will be presented. Also to be discussed is the use of solid residue, namely, the olive leaf and the olive stone. Both of these types of residue result from olive oil and table olive production, and can be used as a renewable energy source, as well as to obtain high added-value compounds. The latter, bioactive compounds are directed towards the cosmetic, pharmaceutical, and natural food supplements markets, all of which are currently highly receptive to products of natural origin.La investigación de nuevos aprovechamientos del olivar y en particular de lo subproductos del proceso de producción del aceite, tiene gran relevancia tanto en la economía como en el medio ambiente de los pueblos donde se desarrolla este cultivo. Son numerosos los trabajos publicados sobre la composición química de la aceituna y el aceite de oliva, en cambio sólo existen algunos estudios sobre el aislamiento e identificación de los compuestos de la hoja de olivo, en esta contribución se revisan los conocimientos sobre la composición química de la hoja de olivo, así como, las utilizaciones de los residuos sólidos -hoja de olivo y hueso de aceituna- que se originan en la producción del aceite de oliva y de aceitunas de mesa, como energía renovable y para la obtención de compuestos de alto valor añadido. Estos últimos, compuestos bioactivos dirigidos a los mercados de los aditivos alimentarios naturales, farmacéutico y cosm

  2. Determining PCDDs/PCDFs in Combustion-residue of An Open-burning Municipal Waste Site and Its Peripheral Soil with Isotope Dilution HRGC/HRMS Technique%用HRGC/HRMS测定开放式生活垃圾焚烧残余物及周边土壤中的PCDDs/PCDFs

    Institute of Scientific and Technical Information of China (English)

    张素坤; 李晓明; 彭平安; 任曼; 麦碧娴; 盛国英; 傅家谟

    2009-01-01

    以广东省东南沿海某开放式生活垃圾焚烧场为研究对象,用高分辨气相色谱/高分辨质谱同位素稀释法测定了垃圾焚烧场底灰、焚烧残余物及周边土壤中的多氯代二苯并对二嗯英和多氯代二苯并呋喃(PCDDs/PCDFs).结果表明,PCDDs/PCDFs的总浓度为161~4 670 ng·kg~(-1),毒性当量为1.10~45.8 ngWHO_(1998)-TEQ·kg~(-1),其中采自垃圾焚烧场的3个样品浓度为30~45 ngWHO_(1998)-TEQ·kg~(-1),剩余的土壤样品中有3个样品其浓度为4~35 ng WHO_(1998)-TEQ·kg~(-1),其余的2个样品浓度<4 ng WHO_(1998)-TEQ·kg~(-1).对比加拿大的土壤指导性标准,75%的测定样品浓度高于该标准,即土壤背景浓度,有25%的样品低于此背景浓度.将垃圾焚烧场焚烧残余物作为土壤改良剂造成受施土壤的PCDDs/PCDFs污染严重,需引起有关部门的高度重视.%An open-burning municipal waste site located in the southeast coast of Guangdong Province was taken as the subject for this study, and the technique of isotope dilution featuring high resolution gas chromatogram/high resolution mass spectrogram(HRGC/HRMS) was used to determine the concentrations of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans(PCDDs/PCDFs) in the bottom ash and combustion-residue of the waste incineration site and in the peripheral soil. As shown by the analytical results, the total concentration of PCDDs/PCDFs was 161~4670 ng·kg~(-1), which corresponded to a toxic equivalent of 1.10~45.8 ngWHO_(1998)-TEQ·kg~(-1). The concentration for three samples collected from the waste incineration site ranged between 30~45 ngWHO_(1998)-TEQ·kg~(-1). In regard to the peripheral soil samples, three samples concentrations 4~35 ng WHO_(1998)-TEQ·kg~(-1), while the remaining two samples concentrations were lower than 4 ng WHO_(1998)-TEQ·kg~(-1). Based on the Canadian guideline for soil quality, 75% of the samples tested in our study concentrations were greater than the

  3. Extracción, caracterización y evaluación de la actividad antibacteriana del aceite esencial de Senecio graveolens Wedd (Wiskataya

    Directory of Open Access Journals (Sweden)

    Kiev Ochoa Pumaylle

    2012-01-01

    Full Text Available El objetivo del presente trabajo fue extraer, caracterizar y evaluar la actividad antibacteriana del aceite esencial de Senecio graveolens Wedd (Wiskataya frente a Escherichia coli y Staphylococcus aureus ATCC 29923. Las hojas y tallos se recolectaron a una altitud de 3800 m.s.n.m. en el distrito de Puquio, provincia de Lucanas, departamento de Ayacucho. El aceite esencial se obtuvo por destilación por arrastre con vapor de agua, a partir de las hojas y tallos desecados de S. graveolens, con rendimiento de 1,26 % (p/p. La muestra extraída fue caracterizada a través de ensayos físicos. La composición química del aceite se evaluó mediante cromatografía de gas con detector de masa (CG-SM. La actividad antibacteriana del aceite de S. graveolens se realizó por el método de difusión en agar en pocillos, utilizando cepas de microorganismos gram positivo como S. aureus y gram negativo como E. coli. La densidad del producto resultó 0,8755 g/ml a 20 ºC; índice de refracción 1,4726; índice de rotación 102°85’ y soluble en etanol; el cromatograma mostró componentes mayoritarios con un contenido de 52,39 % Sabineno, 8,20 % (+-4-careno, 7,11 % τ-terpineno, 6,74 % β-myrceno, 3,78 % 4-terpinenol, 3,67 % Pulegona. Los resultados mostraron actividad antibacteriana marcada y moderada, para S. aureus y E. coli, respectivamente, observándose formación de halos de inhibición para concentraciones del aceite esencial a 80, 90 y 100 %. El aceite esencial de S. graveolens se presenta con actividad antibacteriana promisoria.

  4. Copolymers of new generation for the dehydrated crude oil (petroleum); Copolimeros de nueva generacion para el deshidratado de aceite crudo (petroleo)

    Energy Technology Data Exchange (ETDEWEB)

    Castro Sotelo, Laura Veronica [Instituto Politecnico Nacional ESIQIE, Mexico, D.F. (Mexico)]. E-mail: lcastros@ipn.mx; Flores Oropeza, Eugenio Alejandro; Hernandez Cortez, Jose Gonzalo; Lopez Ortega, Alfonso; Arreguin Valencia, Felipe [Instituto Mexicano del Petroleo, Mexico, D.F. (Mexico)]. E-mail: eaflores@imp.mx; jhcortez@imp.mx; alopezo@imp.mx; flos2099@yahoo.com.mx; Hernandez Garcia, Arnulfo [Universidad Nacional Autonoma de Mexico, Facultad de Quimica, Mexico, D.F. (Mexico)]. E-mail: arte8080@hotmail.com; Hernandez Xilohua, Arturo Eutiquio [Instituto Mexicano del Petroleo Mexico, D.F. (Mexico)]. E-mail: art_eut@hotmail.com; Ramirez Gutierrez, David; Hernandez Carbajal, Edgar Ivan [Instituto Politecnico Nacional, ESIQIE, Mexico, D.F. (Mexico)]. Email: theprettiestthingever@hotmail.com; hcei11@hotmail.com; Vazquez Moreno, Flavio Salvador [Instituto Mexicano del Petroleo, Mexico, D.F. (Mexico)]. E-mail: flaviusmx@yahoo.com.mx

    2010-11-15

    Crude oil is a mixture of hydrocarbons, salts and water as impurities. When crude oil has high water content, their commercial value is reduced in the market, so the separation of these impurities is important for a better quality product. The content of these impurities in the crude oil reduction is a concern across the world. There are several methods for crude oil dehydration and breaking emulsions; this work presents the results of tests demulsifiers, agents which are different molecular mass polyethers. Using several test bottles compared performance agents demulsifiers which were assessed at different concentrations in a heavy crude oil from wells in the southeast of Mexico. The evaluation results showed the range of molecular mass of polymers that provide better performance for the abatement of the water content in the crude oil. [Spanish] El aceite crudo es una mezcla de hidrocarburos, sales y agua como impurezas. Cuando el aceite crudo presenta alto contenido de agua, su valor a nivel comercial se reduce en el mercado, por lo que es importante la separacion de estas impurezas para obtener un producto de mejor calidad. La reduccion del contenido de estas impurezas en el aceite crudo es una preocupacion a nivel mundial. Existen varios metodos para la deshidratacion del aceite crudo y romper las emulsiones; en este trabajo se presentan los resultados de pruebas con agentes desemulsificantes, los cuales son polieteres de diferente masa molecular. Mediante varias pruebas de botellas se comparo el desempeno de los agentes desemulsificantes los cuales fueron evaluados a diferentes concentraciones en un aceite crudo pesado procedente de pozos del Sureste de Mexico. Los resultados de la evaluacion mostraron el intervalo de masa molecular de los polimeros que proporcionan un mejor desempeno en el abatimiento del contenido de agua en el aceite crudo.

  5. Caracterización fisicoquímica de los aceites crudos de algunas semillas de leguminosas del desierto sonorense

    Directory of Open Access Journals (Sweden)

    Ortega-Nieblas, M.

    1995-02-01

    Full Text Available The Sonoran desert has a great variety of nutritional native plants, mainly from the leguminous family. Although in ancient times their products were used as food by native Americans, there is little information about their potential as a food source. For this reason, oils from the following seeds were studied: Acacia famesiana (huizache, Mimosa grahamii (gatuña, Cercidium microphyilium (palo verde 1, Cercidium sonorae (brea, Parkinsonia aculeata (palo verde 2, Olneya Tesota (palo fierro and Prosopis juliflora (mezquite.
    Oils were extracted from the seeds with hexane, and contents ranged from 8.5 to 23.5 %. The physicochemical studies showed mostly unsaturated oils, as demonstrated by the iodine index, (101-147 units. Indexes of acidity, peroxides and free fatty acids were low and within the accepted values. Fatty acids were separated and quantified by gas chromatography. Linoleic and oleic acids were found to predominate. All extracted crude oils were of good quality, comparable to those from soybean, com, sunflower and carthamus.

    El desierto de Sonora cuenta con una gran variedad de plantas silvestres principalmente de la familia leguminosae de las cuales se tiene poca información acerca de su potencial como fuente nutricional. Por lo que se estudiaron los aceites de las semillas: Acacia famesiana (huizache, Mimosa grahamii (gatuña, Cercidium microphyilium (palo verde 1, Cercidium sonorae (brea, Parkinsonia aculeata (palo verde 2, Olneya Tesota (palo fierro y Prosopis juliflora (mezquite.
    Los aceites de cada semilla se extrajeron con hexano, obteniéndose de 8.5 a 23.5 %. Estos mostraron un alto grado de insaturación reflejado en los índices de lodo, de 101 a 147. Los índices de acidez, peróxidos y ácidos grasos libres fueron bajos y dentro de los valores aceptables. Al cuantificar los ácidos grasos por

  6. Mezclas binarias y ternarias del aceite y grasa hidrogenada de la castaña de Brasil (Bertholletia excelsa

    Directory of Open Access Journals (Sweden)

    Polakiewicz, Bronislaw

    2000-12-01

    Full Text Available Crude Brazilian nut oil was hydrogenated at 175ºC, 3 atm., 60 minutes (GH1, and 150ºC, 1 atm., 30 minutes (GH2, and with this products and the crude oil were prepared ternary blends. Fatty acids demonstrated the increase of stearic acid from 11.6% of crude oil to 56.7% in GH1 and 16.3% in GH2. In the blends, were determined the yield point, solid fat content, melting point and viscosity, for this blends were applied a special model of multiple regression. Results showed that the estimated properties were not dependent on the three components interactions. In general, the significant interactions, blends crude oil/GH1 and GH1/GH2, showed an antagonic, effect to consistency and solid fat content, typical of eutectic interactions of fats. The interactions were not significative for melting point and viscosity at 60ºC, attesting a perfect mixing model.El aceite de castaña de Brasil crudo se sometió a dos hidrogenaciones, a 175ºC, 3 atm, 60 minutos (GH1, y a 150ºC, 1 atm., 30 minutos (GH2, y con los productos de éstas, y el aceite original, se prepararon mezclas binarias y ternarias. Se incrementó la concentración del ácido esteárico de 11.6% del aceite original a 56.7% en GH1 y a 16.3% en GH2. Se realizaron los análisis de consistencia, contenido de grasa sólida, punto de fusión y viscosidad, y sobre estos parámetros se aplicó un modelo de regresión múltiple. Los resultados indicaron que las propiedades estimadas no dependían de las interacciones de los tres componentes. Las interacciones fueron significativas para las mezclas de aceite bruto/GH1 y GH1/GH2, demostrando efecto antagónico para la consistencia y contenido de grasa sólida. Las interacciones no fueron significativas para el punto de fusión y viscosidad a 60ºC, demostrando un modelo perfecto de mezcla.

  7. Experimentacion y optimizacion conjunta de la disrupcion celular de microalgas y extraccion soxhletde aceite para alimentacion y biocombustibles

    OpenAIRE

    2014-01-01

    La producción de biocombustibles y bioproductos utilizando microalgas puede realizarse con tratamientos térmicos para producir biocrudo, o mediante la extracción y transformación de metabolitos específicos. Esta última alternativa incluye las etapas de cultivo, cosecha, secado, extracción de lípidos y purificación o transformación de los mismos. La factibilidad técnica y económica de la obtención de bioproductos derivados del aceite de microalgas depende en gran medida de la eficiencia de ext...

  8. Hormigón resistente al aceite por adición de Zempor-B7

    Directory of Open Access Journals (Sweden)

    Editorial, Equipo

    1963-03-01

    Full Text Available Not availableA un ritmo creciente se elaboran cada día suelos con las más variadas clases de hormigón. Si estos suelos de hormigón entran en contacto con aceites minerales, carburantes y otros hidrocarburos o disolventes orgánicos en general, se presentan dificultades. Porque estas sustancias de origen orgánico y relativamente poco viscosas penetran rápidamente en la estructura y disminuyen la resistencia del hormigón llegando a través del tiempo a la destrucción total.

  9. Viabilidad financiera para la creación de una empresa productora y exportadora de aceite de jojoba.

    OpenAIRE

    Cornejo Guerra, Félix Efraín

    2015-01-01

    En el Ecuador existen zonas con climas áridos y semiáridos, propicias para el cultivo de productos que no son de uso masivo, sin embargo representan grandes oportunidades comerciales por sus propiedades fisiológicas y químicas. Uno de los productos al cual hacemos referencia es al aceite de jojoba, un producto extraído por medio de la prensa de la semilla de la planta del mismo nombre. La jojoba ( Simmondsia chinensis ) es un arbusto de hoja que es nativo de las zonas áridas calientes del nor...

  10. Subproductos generados en el proceso de producción de biodiesel a partir de aceite de tempate

    OpenAIRE

    Leiva Bautista, Claudia

    2012-01-01

    Se realizaron los balances de materiales en el proceso de producción de biodiesel, lo cual permitió determinar las cantidades de reactivos que entran al proceso: aceite, metanol e hidróxido de sodio y las cantidades producidas de biodiesel y glicerina, así como la cantidad de metanol que no reaccionó. El biodiesel es el producto deseado y la glicerina es un subproducto que tiene un valor comercial. Se realizó el balance de energía. En cuanto concierne a biocombustibles, el balance energético ...

  11. Estudio de la composición química de las semillas y aceites seminales de Ligustrum lucidum Ait y Ligustrum sinense Lour

    Directory of Open Access Journals (Sweden)

    Nolasco, S. M.

    2001-02-01

    Full Text Available The fruits of Ligustrum lucidum Ait and Ligustrum sinense Lour were harvested in Olavarria (Province of Buenos Aires, Argentine. The seeds and extracted oils were analysed for characteristics and composition. The seed contained 8,7-10 and 10,7 % (dry basis, respectively. The physicochemical characteristics of the crude oils were: refractive index 1,4647 and 1,4640 (at 25ºC, iodine value 93,7 and 88,8, saponification index 167 and 154, unsaponifiable matter 11 and 18 %, and free fatty acid content of 4,8 and 9,2 (mg KOH/g, respectively. Gas chromatographic analysis of the oils revealed high levels of oleic acid (57,8 and 51,10%, about 25,1 and 29,6 % of saturated acids, respectively, most of them consisting of palmitic acid, but they have a significant content of acid of more than 18 atoms of carbon. The residual seed meals contained low level of crude protein and of available lysine (2.45, 3.65, g/16g N, respectively. Total and phytic acid phosphorous, calcium, ash, crude fiber, and polysaccharides (non presence of starch contents are reported.Frutos de Ligustrum lucidum Ait y Ligustrum sinense Lour fueron cosechados en Olavarría (provincia de Buenos Aires, Argentina y sus semillas separadas en forma manual. Las semillas se agotaron con n-hexano, obteniendo los aceites crudos con rendimientos del 8,7-10% y 10,7 % (base seca, respectivamente. Los aceites crudos se examinaron en sus características fisicoquímicas (Índice de refracción: 1,4647 y 1,4640 (a 25ºC, Indice de iodo: 93,7 y 88,8, Indice de saponificación: 167 y 154, insaponificable: 11 y 18 %, Indice de acidez: 4,8 y 9,2 (mgKOH/g respectivamente. El análisis por cromatografía gaseosa de los ésteres metílicos reveló alto porcentaje de ácido oleico (57,8 y 51,1%, alrededor de un 25,1 y 29,6 % de ácidos saturados, respectivamente, predominando el ácido palmítico, pero con un significativo contenido de ácidos de más de 18 átomos de carbono. Las harinas residuales de

  12. Combustion of drops of Mexican fuel oils with high asphaltenes content; Combustion de gotas de combustoleos mexicanos con alto contenido de asfaltenos

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Rodriguez, Jose Francisco [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1998-09-01

    In this work the combustion of fuel drops with a content of 18% of asphaltenes has been studied . The results obtained for this fuel were compared with the ones obtained for another with a content of 12% asphaltenes. The drops were suspended in a platinum filament and burned in an spherical radiant furnace. The drop size varied between 600 and 800 microns. The fuel drops with 12% asphaltenes showed shorter combustion times, a smaller diameter increment of the smaller diameter during the combustion stages and also a shorter burning time of the carbonaceous residue than the fuel drops with a content of 18% asphaltenes. [Espanol] En el presente trabajo se ha estudiado la combustion de gotas de combustible con 18% de contenido de asfaltenos. Los resultados obtenidos para este combustible se compararon con los obtenidos para otro con 12% de contenido de asfaltenos. Las gotas fueron suspendidas en un filamento de platino y quemadas en un horno radiante esferico. El tamano de las gotas vario entre 600 y 800 micras. Las gotas de combustible con 12% de asfaltenos mostraron tiempos de combustion mas cortos, un incremento del diametro menor durante las etapas de combustion y un tiempo de quemado del residuo carbonoso tambien mas corto que las gotas del combustible con 18% de contenido de asfaltenos.

  13. Internal combustion engine

    Energy Technology Data Exchange (ETDEWEB)

    Williams, G.J.

    1986-06-03

    A variable power internal combustion engine is described which consists of: a separate air compressor for receiving and compressing a flow of air to a given pressure, the compressor having an inlet valve introducing a flow of air into the compressor and an outlet valve for exhausting compressed air out of the compressor into a compressed air storage means, at least one expander having a cylinder, a cylinder head closing an end of the cylinder, a piston reciprocally mounted in the cylinder for movement away from the cylinder head in a power stroke from an initial position defining a combustion chamber within the cylinder between the cylinder head and the piston, the compressed air storage means receiving the pressurized flow of air from the compressor and being of a volume adequate to provide compressed air in the combustion chamber essentially at the given pressure essentially over the power output of the engine, means for introducing an amount of combustible fuel in the compressed charge to be present with compressed air in the combustion chamber and providing combustion of the amount of fuel in the cylinder with the inlet and exhaust valves closed, cam shaft means in contact with the piston for absorbing and storing the energy of the power stroke of the piston and controlling movement of the piston within the cylinder during the exhaust stroke; the means for varying the volume of the combustion chamber being controlled in accordance with power requirements to provide variable power output and improved efficiency of the engine at power outputs reduced relative to a given design power output of the engine by providing a variable expansion ratio of a minimum of at least about 30 to 1 at the given design power output and higher with reduced power output.

  14. Comportamiento del aceite hidráulico y la influencia de su contaminación en los sistemas hidráulicos de los tractores

    OpenAIRE

    Luciano Pérez Sobrevilla; Pedro Paneque Rondón

    2007-01-01

    La investigación desarrollada en la Universidad Autónoma Chapingo, Departamento de Ingeniería Mecánica Agrícola, en colaboración con la Universidad Agraria de La Habana, Centro de Mecanización Agropecuaria, estudia en una primera etapa, durante un año de trabajo, el comportamiento del aceite hidráulico Elf Disal HD 4/40 PLUS en dos estados diferentes, uno totalmente nuevo y otro recuperado, a partir de aceites hidráulicos residuales, mediante un proceso de centrifugación y filtración. Se anal...

  15. Reinicio de la actividad ovárica y nivel de metabolitos de lípidos en vacas lecheras suplementadas con aceite vegetal durante el posparto temprano

    OpenAIRE

    Alejandra M. Marín-Aguilar; Juan Carlos Tinoco-Magaña; José Herrera-Camacho; Laura G. Sánchez-Gil; Victor M. Sánchez-Parra; Jose Luis Solorio-Rivera; Antonio García-Valladares

    2007-01-01

    Se evaluó el reinicio de la actividad ovárica posparto (RAO) y los metabolitos de lípidos en vacas lecheras suplementadas con aceite vegetal durante el posparto temprano. Se emplearon 18 vacas Holstein Friesian de tercer parto, de 597,3 ±50,2kg y condición corporal= 3,5 ±0,6. Los animales fueron distribuidos aleatoriamente en dos grupos, uno experimental suplementado con 500g de aceite vegetal durante 8 semanas a partir de la segunda semana posparto (CAV; n=9), y uno control sin suplemento (S...

  16. Microencapsulación mediante secado por aspersión de aceite de mora (Rubus glaucus) extraido con CO2 supercrítico

    OpenAIRE

    Paola Milena Figueroa Martínez; Andrés Mauricio Hurtado Benavides; Miguel Angel Ceballos Ortíz

    2016-01-01

    El aceite de mora es un ingrediente natural con potencial en la industria cosmética y alimentaria, a su vez puede experimentar degradación oxidativa en condiciones ambientales. Por ello, se extrajo aceite a partir de semillas de mora empleando fluidos supercríticos y, posteriormente, se microencapsuló mediante secado por aspersión y se  evaluó la influencia de diferentes condiciones de operación en el rendimiento, y la eficiencia del proceso. Se emplearon como materiales encapsulantes: master...

  17. Extracción de aceite lubricante usado en equipos de bombeo y generación eléctrica con Propano Supercrítico

    OpenAIRE

    Calderón Cisneros, Manuel Delfín

    2012-01-01

    En el siguiente trabajo investigativo se pretende realizar el estsudio experimental de las propiedades extractivas del propano supercrítico aplicadas a los hidrocarburos presentes en los aceites lubricantes usados que provienen de la industria automotriz. La extracción supercrítica con propano permitirá eliminar la mayor cantidad de contaminantes presentes en el aceite lubricante usado tales como: agua, partículas metálicas, ocasionadas por el desgaste de las piezas en movimiento y fricción, ...

  18. Evaluación de la actividad repelente de aceites esenciales de plantas Piperáceas del departamento de Chocó, Colombia

    OpenAIRE

    2015-01-01

    El objetivo de este trabajo fu e determinar la composición química volátil del aceite esencial de varias especies de Piper áceas ( Piper dilatatum, Piper aduncum, Piper divaricatum, Piper sp, Piper sanctifelicis) y la actividad repelente de ellos contra el gorgojo de granos almacenados Tribolium castaneum Herbst. Los aceites esenciales se obtuvieron por hidrodestilación, la separación e identificación de los component es volátiles se realizó por cromatografía de gase...

  19. Actividad antibacteriana de aceites esenciales de orégano y tomillo incorporados en soluciones formadoras de films sobre la microbiota superficial de filetes de merluza

    OpenAIRE

    Elizari Reta, Iñaki

    2013-01-01

    Los aceites esenciales de orégano y tomillo han demostrado ser eficaces antimicrobianos. Su uso como aditivos en películas y recubrimientos comestibles permite prolongar y localizar su efecto en las zonas deseadas, reduciendo la cantidad necesaria. Se estudió la actividad antibacteriana de los aceites esenciales de orégano y tomillo, incorporados en soluciones formadoras de films de proteína del suero de leche, sobre la microbiota superficial aislada de filetes de merluza conservados en atmós...

  20. Combustible structural composites and methods of forming combustible structural composites

    Science.gov (United States)

    Daniels, Michael A.; Heaps, Ronald J.; Steffler, Eric D; Swank, William D.

    2011-08-30

    Combustible structural composites and methods of forming same are disclosed. In an embodiment, a combustible structural composite includes combustible material comprising a fuel metal and a metal oxide. The fuel metal is present in the combustible material at a weight ratio from 1:9 to 1:1 of the fuel metal to the metal oxide. The fuel metal and the metal oxide are capable of exothermically reacting upon application of energy at or above a threshold value to support self-sustaining combustion of the combustible material within the combustible structural composite. Structural-reinforcing fibers are present in the composite at a weight ratio from 1:20 to 10:1 of the structural-reinforcing fibers to the combustible material. Other embodiments and aspects are disclosed.

  1. Characterization of enzymatically extracted sunflower seed oil as well as the protein residues

    Directory of Open Access Journals (Sweden)

    Sitohy, M. Z.

    1993-12-01

    Full Text Available Sunflower seed oil was enzymatically extracted with six different enzymes: cellulase, hemicellulase, animal proteinase, acid proteinase, pectinase and pectinex under the following conditions: substrate concentration in phosphate buffer (0.5M, pH 5 30%, enzyme concentration 2% (E/S, temperature 50°C and time 3 hours. The obtained oils were analyzed for physicochemical properties and fatty acid profiles. The protein residues were analyzed for amino acid compositions. The results showed that the enzymatic extraction with cellulase or hemicellulase could maintain good oil quality of the extracted oils as their levels of linoleic and oleic acids recorded similar values to those of the control oil extracted with organic solvents. Also the level of iodine value was in the same level of control. On the other hand, the use of proteases in the enzymatic extraction of sunflower seed oil caused some reductions in the levels of the unsaturated fatty acids as well as the iodine value. The pectinases showed a similar trend to that of the proteinase with the least recovery of linoleic acid among the different oils under study. Similarly, the use of cellulases did not change the amino acid composition of the protein residue as compared to the control, in the contrary to the extraction with the proteinases which caused reduction of some amino acids from the protein residues especially lysine, leucine, iso-leucine, alanine, arginine and aspartic. In that respect the use of pectinases behaved similar to cellulases.

    Aceite de semilla de girasol fue extraído enzimáticamente con seis enzimas diferentes: celulasa, hemicelulasa, proteinasa animal, proteinase acida, pectinasa y pectinex bajo las condiciones siguientes: concentración de sustrato en tampón fosfato (0,5M, pH 5 30%, concentración enzimática 2% (E/S, temperatura 50°C y tiempo 3 horas. Los aceites obtenidos fueron analizados por sus propiedades fisicoquímicas y perfiles de ácidos grasos

  2. Combustion and regulation; Combustion et reglementation

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1997-12-31

    This conference was organized after the publication of the French by-law no 2010 relative to combustion installations and to the abatement of atmospheric pollution. Five topics were discussed during the conference: the new regulations, their content, innovations and modalities of application; the means of energy suppliers to face the new provisions and their schedule; the manufacturers proposals for existing installations and the new equipments; the administration control; and the impact of the new measures on exploitation and engineering. Twenty papers and 2 journal articles are reported in these proceedings. (J.S.)

  3. Optical Tomography in Combustion

    DEFF Research Database (Denmark)

    Evseev, Vadim

    spectral measurements at several line-of-sights with a view to applications for tomographic measurements on full-scale industrial combustion systems. The system was successfully applied on industrial scale for simultaneous fast exhaust gas temperature measurements in the three optical ports of the exhaust......D project, it was also important to investigate the spectral properties of major combustion species such as carbon dioxide and carbon monoxide in the infrared range at high temperatures to provide the theoretical background for the development of the optical tomography methods. The new software....... JQSRT 113 (2012) 2222, 10.1016/j.jqsrt.2012.07.015] included in the PhD thesis as an attachment. The knowledge and experience gained in the PhD project is the first important step towards introducing the advanced optical tomography methods of combustion diagnostics developed in the project to future...

  4. EVALUACIÓN DE LA TOLERANCIA A SUELOS CONTAMINADOS CON ACEITE DIESEL EN ESPECIES VEGETALES CON POTENCIAL BIORREMEDIADOR

    Directory of Open Access Journals (Sweden)

    MARÍA CRISTINA PETENELLO

    2012-01-01

    Full Text Available Los suelos contaminados con petróleo o sus derivados pueden ser remediados a través de diversos métodos, dentro de los cuales se encuentran aquellos que emplean organismos vivos tales como plantas, que poseen la capacidad de mineralizar estos compuestos transformándolos en otros más simples, asimilables a compuestos naturales. Al encarar proyectos de fitorremediación es importante emplear plantas nativas porque están adaptadas a las condiciones ecológicas particulares de la región. En el presente trabajo como primera etapa se evaluó la respuesta de Spartina argentinensis, Paspalum atratum, Paspalum guenoarum y Melilotus albus a la presencia de aceite diesel, considerando la germinación de sus semillas, la emergencia de plántulas y la biomasa alcanzada en suelos que contenían 1 y 2 % de aceite diesel, en condiciones experimentales. Todos estos parámetros se vieron afectados con las concentraciones de contaminante empleadas, sin embargo, las plantas pudieron prosperar demostrando en consecuencia que podrían ser empleadas en proyectos de fitorremediación.

  5. Método rápido para la determinación de escualeno en aceites vegetales

    Directory of Open Access Journals (Sweden)

    Lanzón, A.

    1995-10-01

    Full Text Available A simple and rapid analytical method for the quantification of squalene in vegetable oils is described. The method consists of a cold alkaline methylation of the oil sample diluted with hexane followed by quantitation by gas chromatography with internal standard. A calibration curve obtained using different standard solutions, and coefficients of variation for three different samples with high, medium and low content of squalene, are reported.

    Se describe un método analítico, sencillo y rápido, para la cuantificación de escualeno en aceites comestibles. El método consiste en realizar primero una metilación alcalina en frío de la muestra grasa disuelta en hexano y, posterior análisis de la disolución de hexano por cromatografía gaseosa usando patrón interno. Se presentan una recta de calibrado con patrones cromatográficos puros, así como, los coeficientes de variación de muestras de aceites con alto, medio y bajo contenido en escualeno.

  6. Técnicas de aislamiento y concentración de volátiles de aceites vegetales

    Directory of Open Access Journals (Sweden)

    Morales, M. T.

    1992-06-01

    Full Text Available One of the methods for food flavor evaluation is the analysis of volatile components. First step in this kind of analysis Is the isolation and concentration of volatiles. A review is carried out about different techniques applied in foods and especially in vegetable oils. Very different methods have been used, an explication of each one with its different cases are presented. Likewise the applications carried out in vegetable oils during last years are discussed.

    Uno de los métodos de evaluación del flavor de los alimentos consiste en la determinación de sus componentes volátiles. La primera etapa necesaria para realizar este tipo de análisis es el aislamiento y concentración de los mismos. Se ha realizado una revisión bibliográfica sobre las diferentes técnicas utilizadas para este fin en diferentes alimentos y especialmente en aceites vegetales. Los métodos utilizados son muy diversos, se ofrece una explicación de cada uno de ellos considerando las diferentes variantes existentes. Asimismo se detallan las aplicaciones realizadas en aceites vegetales durante los últimos años.

  7. Novel approaches in advanced combustion characterization of fuels for advanced pressurized combustion

    Energy Technology Data Exchange (ETDEWEB)

    Aho, M.; Haemaelaeinen, J. [VTT Energy (Finland); Joutsenoja, T. [Tampere Univ. of Technology (Finland)

    1996-12-01

    This project is a part of the EU Joule 2 (extension) programme. The objective of the research of Technical Research Centre of Finland (VTT) is to produce experimental results of the effects of pressure and other important parameters on the combustion of pulverized coals and their char derivates. The results can be utilized in modelling of pressurized combustion and in planning pilot-scale reactors. The coals to be studied are Polish hvb coal, French lignite (Gardanne), German anthracite (Niederberg) and German (Goettelbom) hvb coal. The samples are combusted in an electrically heated, pressurized entrained flow reactor (PEFR), where the experimental conditions are controlled with a high precision. The particle size of the fuel can vary between 100 and 300 {mu}m. The studied things are combustion rates, temperatures and sizes of burning single coal and char particles. The latter measurements are performed with a method developed by Tampere University of Technology, Finland. In some of the experiments, mass loss and elemental composition of the char residue are studied in more details as the function of time to find out the combustion mechanism. Combustion rate of pulverized (140-180 {mu}m) Gardanne lignite and Niederberg anthracite were measured and compared with the data obtained earlier with Polish hvb coal at various pressures, gas temperatures, oxygen partial pressures and partial pressures of carbon dioxide in the second working period. In addition, particle temperatures were measured with anthracite. The experimental results were treated with multivariable partial least squares (PLS) method to find regression equation between the measured things and the experimental variables. (author)

  8. Alcohol combustion chemistry

    KAUST Repository

    Sarathy, Mani

    2014-10-01

    Alternative transportation fuels, preferably from renewable sources, include alcohols with up to five or even more carbon atoms. They are considered promising because they can be derived from biological matter via established and new processes. In addition, many of their physical-chemical properties are compatible with the requirements of modern engines, which make them attractive either as replacements for fossil fuels or as fuel additives. Indeed, alcohol fuels have been used since the early years of automobile production, particularly in Brazil, where ethanol has a long history of use as an automobile fuel. Recently, increasing attention has been paid to the use of non-petroleum-based fuels made from biological sources, including alcohols (predominantly ethanol), as important liquid biofuels. Today, the ethanol fuel that is offered in the market is mainly made from sugar cane or corn. Its production as a first-generation biofuel, especially in North America, has been associated with publicly discussed drawbacks, such as reduction in the food supply, need for fertilization, extensive water usage, and other ecological concerns. More environmentally friendly processes are being considered to produce alcohols from inedible plants or plant parts on wasteland. While biofuel production and its use (especially ethanol and biodiesel) in internal combustion engines have been the focus of several recent reviews, a dedicated overview and summary of research on alcohol combustion chemistry is still lacking. Besides ethanol, many linear and branched members of the alcohol family, from methanol to hexanols, have been studied, with a particular emphasis on butanols. These fuels and their combustion properties, including their ignition, flame propagation, and extinction characteristics, their pyrolysis and oxidation reactions, and their potential to produce pollutant emissions have been intensively investigated in dedicated experiments on the laboratory and the engine scale

  9. Transition nozzle combustion system

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Won-Wook; McMahan, Kevin Weston; Maldonado, Jaime Javier

    2016-11-29

    The present application provides a combustion system for use with a cooling flow. The combustion system may include a head end, an aft end, a transition nozzle extending from the head end to the aft end, and an impingement sleeve surrounding the transition nozzle. The impingement sleeve may define a first cavity in communication with the head end for a first portion of the cooling flow and a second cavity in communication with the aft end for a second portion of the cooling flow. The transition nozzle may include a number of cooling holes thereon in communication with the second portion of the cooling flow.

  10. Studies in combustion dynamics

    Energy Technology Data Exchange (ETDEWEB)

    Koszykowski, M.L. [Sandia National Laboratories, Livermore, CA (United States)

    1993-12-01

    The goal of this program is to develop a fundamental understanding and a quantitative predictive capability in combustion modeling. A large part of the understanding of the chemistry of combustion processes comes from {open_quotes}chemical kinetic modeling.{close_quotes} However, successful modeling is not an isolated activity. It necessarily involves the integration of methods and results from several diverse disciplines and activities including theoretical chemistry, elementary reaction kinetics, fluid mechanics and computational science. Recently the authors have developed and utilized new tools for parallel processing to implement the first numerical model of a turbulent diffusion flame including a {open_quotes}full{close_quotes} chemical mechanism.

  11. l aceite de atún como fuente de ácidos grasos ω-3 en el huevo de gallina

    Directory of Open Access Journals (Sweden)

    Vázquez-Valladolid, J. L.

    2005-06-01

    Full Text Available Fish oils are a source of polyunsaturated omega 3 fatty acids (AG ω3, mainly eicosapentaenoic acid (EPA and docosahexaenoic acid (DHA, which supply many benefits to human health. Tuna oil was used as a source of marine 3ω FA to enrich eggs by supplementing the diet of egg-laying hens with tuna oil. One hundred and twenty White Leghorn hens of 90 weeks old were allocated on three treatments with four replicates each, on a completely random design. Treatments consisted of adding 1 % and 2 % of tuna oil to the diets. The total lipids and ω3FA of the eggs were determined. The egg-laying hen dietary tuna oil supplement (1 and 2 % enriched eggs with 300 % more EPA (0.40, 1.37, 1.54 mg/g lipids and DHA (7.90, 24.67, 24.50 mg/g lipids versus the control egg . The ω6:ω3 ratio decreased ( 11.4:1, 3.8:1, 3.0:1 as dietary tuna oil increased. There were no differences (p>0.05 among treatments in productive performance and egg quality, except egg weight which decreased with the tuna oil.Los aceites de pescado son una fuente de lípidos poliinsaturados de origen animal, principalmente de los ácidos grasos omega-3 (AG ω-3, eicosapentaenoico (EPA y docosahexaenoico (DHA, beneficiosos para la salud. En este trabajo se utilizó el aceite de atún como fuente de estos nutrientes en el huevo para consumo. Se utilizaron 120 gallinas blancas Leghorn Isa-Babcock B-300 de 90 semanas de edad, distribuidas al azar en tres tratamientos, con cuatro réplicas cada uno. Los tratamientos consistieron en adicionar 1% y 2% de aceite de atún en la dieta de las gallinas ponedoras. Se determinaron los lípidos totales y AG ω-3 en el huevo, obteniéndose 300 % más de EPA (0,40, 1,37, 1,54 mg/g lípidos y DHA (7,90, 24,67, 24,50 mg/g lípidos al adicionar 1 y 2% de aceite de atún en la dieta de las aves, que en el grupo testigo. La relación ω-6: ω-3 en el huevo disminuyó con el suplemento dietético de aceite de atún (11,4:1, 3,8:1, 3:1, lo mismo ocurri

  12. Toxicology of Biodiesel Combustion products

    Science.gov (United States)

    1. Introduction The toxicology of combusted biodiesel is an emerging field. Much of the current knowledge about biological responses and health effects stems from studies of exposures to other fuel sources (typically petroleum diesel, gasoline, and wood) incompletely combusted. ...

  13. Quality of Cuban shark liver oil. Comparison with Icelandic cod liver oil (Calidad del aceite de hígado de tiburón cubano. Comparación con el aceite de hígado de bacalao Islandés

    Directory of Open Access Journals (Sweden)

    Cruz-Nuñez, Giselle

    2009-02-01

    Full Text Available ResumenA través del contenido de vitaminas A, D y E, dioxinas, metales pesados y escualeno, se estudió la calidad del aceite de hígado de tiburón obtenido a partir de un pool de hígados de tres especies de tiburones (Ginglimostoma cirratum, Carcharhinus longimanus, y Carcharhinus falciformiscapturados en costas cubanas. Se evalúan los contenidos de hierro y cobre como indicadores de posible oxidación en el aceite. Se determinan los niveles de rancidez del aceite mediante análisis sensoriales. Las dioxinas y los bifenilos policlorados (BPC son químicos muy persistentes responsables de la contaminación en los aceites de pescado, cuyo contenido es también evaluado. También se estudió el aceite de hígado de bacalao de la especie Gadus morhua y otras especies de Gadus del suroeste de Islandia, con el fin de comparar ambos aceites en términos de sucalidad. En el aceite de hígado de tiburón cubano se detectó un bajocontenido de escualeno. Su contenido de vitaminas E y A indica que puede ser potencialmente utilizado como suplemento nutricional, contribuyendo a una completa utilización de los hígados de tiburones cubanos. No se detectó vitamina D. El contenido de hierro y cobre indica que el aceite constituye una buena fuente de estos minerales. Los análisis sensoriales revelaron niveles ligeramente más elevados de rancidez en el aceite de bacalao islandés que en el aceite de hígado de tiburón cubano. No se detectó un alto contenido de dioxinas en el aceite de hígado de tiburón cubano (3.69 ngkg-1, menor que los limites permisibles para aceites crudos, (Food Standard Agency, 2002. Las dioxinas como PCBs detectadas en el aceite (14.3 ngkg-1 pueden ser removidas durante los procesos de purificación en la producción.SummaryThe quality of shark liver oil obtained from a pool of livers of three sharks species (Ginglimostoma cirratum, Carcharhinus longimanus, and Carcharhinus falciformis caught in the Cuban coast was studied by

  14. Composición química y actividad antibacteriana del aceite esencial de Peperomia acuminata de los Andes venezolanos

    Directory of Open Access Journals (Sweden)

    Flor D. Mora-Vivas

    2016-12-01

    Full Text Available El género Peperomia (Piperaceae, es bien conocido por sus especies ornamentales y usos etnomedicinales. En el presente trabajo se describe la caracterización química y la actividad antibacteriana del aceite esencial de Peperomia acuminata Ruiz & Pav. proveniente del Estado Mérida Venezuela. El aceite esencial se obtuvo por hidrodestilación de las hojas y la separación de los componentes se realizó por Cromatografía de gases-Espectrometría de Masas (CG/EM. Se logró la elucidación de ocho compuestos (96,7%, siendo el 2E-dodecenal el componente mayoritario (65% seguido de dodecanal (14,8% y tetradecanal (9,2%. Esta investigación muestra el potencial del aceite esencial de P. acuminata frente a bacterias Gram positivas (Staphylococcus aureus ATCC 25923 y Enterococcus faecalis 29212, con un valor de Concentración inhibitoria mínima de 1μL/mL. Este es el primer reporte sobre la composición química del aceite esencial de esta especie, por lo tanto una contribución importante al estudio del género Peperomia.

  15. Caracterización fisicoquímica del aceite crudo y refinado de la semilla de Proboscidea parviflora (Uña de gato

    Directory of Open Access Journals (Sweden)

    Vázquez Moreno, L.

    1993-02-01

    Full Text Available Searching for seeds as new sources of oleaginous that can cover the national needs, it was studied the oil of Proboscidea parviflora. This oil was extracted from the seed with hexane in a Soxhlet apparatus, and its physical and chemical properties were determined, as well as the fatty acid composition by gas chromatography, in crude and refined oil. After a simple refining and deodorization process, the extracted oil had good quality with a high percentage of insatured fatty acids.En la búsqueda de semillas que sirvan como nuevas fuentes de oleaginosas para cubrir las necesidades existentes a nivel nacional, se estudió el aceite de Proboscidea parviflora. El aceite se extrajo de la semilla con hexano en un aparato Soxhlet. Se le determinaron sus propiedades físicas y químicas, así como el perfil de ácidos grasos por cromatografía de gases, tanto del aceite crudo como del refinado. Después de un proceso sencillo de refinación y desodorización, el aceite resultó ser de buena calidad con un grado de insaturación relativamente alto.

  16. Nuevo equipo de proceso de destilación fraccionada en continuo por arrastre con vapor de aceites esenciales del jugo de limón mexicano

    Directory of Open Access Journals (Sweden)

    Francisco J. Padilla M.

    2007-01-01

    Full Text Available En este trabajo se presenta un nuevo equipo llamado Destilador-Fraccionador Horizontal, para realizar el procesos de destilación fraccionada en continuo por arrastre de vapor de aceites esenciales obtenidos a partir del jugo de limón mexicano (Citrus aurantifolia. La capacidad de fraccionación del nuevo equipo es analizada con soluciones modelo y soluciones reales de jugo de limón. Se emplean diseños experimentales y métodos estadísticos para investigar el desempeño del equipo y para validar su capacidad de fraccionar. Mediante la determinación de la relación S/F (gramos de vapor necesario para extraer 1 g de aceite destilado en la fase vapor, se determina que el nuevo equipo requiere una menor cantidad de energía para lograr la separación de los aceites esenciales. Eficiencias de extracción de aceites esenciales superiores al 90% son alcanzadas empleando las soluciones reales de jugo de limón.

  17. Combustion Models in Finance

    CERN Document Server

    Tannous, C

    2001-01-01

    Combustion reaction kinetics models are used for the description of a special class of bursty Financial Time Series. The small number of parameters they depend upon enable financial analysts to predict the time as well as the magnitude of the jump of the value of the portfolio. Several Financial Time Series are analysed within this framework and applications are given.

  18. Coal combustion research

    Energy Technology Data Exchange (ETDEWEB)

    Daw, C.S.

    1996-06-01

    This section describes research and development related to coal combustion being performed for the Fossil Energy Program under the direction of the Morgantown Energy Technology Center. The key activity involves the application of chaos theory for the diagnosis and control of fossil energy processes.

  19. Experimental combustion an introduction

    CERN Document Server

    Mishra, D P

    2014-01-01

    ""… other books available in this area do not cover the detailed topics covered here. Energy and combustion is a hot issue. It is expected to be even hotter with more demand in this area as we search for cleaner methods of energy conversion from chemical to thermal energy.""-Ashwani K. Gupta, Department of Mechanical Engineering, University of Maryland, College Park, USA

  20. Flameless Combustion Workshop

    Science.gov (United States)

    2005-09-20

    operating hours, to produce low emission levels of NOx, CO and UHC . Gas turbine combustion stability has increasingly become a crucial design issue as...achieved proved: "* Safe and reliable operation ofgas turbine combustors "* Low emissions of NO., CO and UHC These results have clear economically

  1. Optimización de la Producción de Alquil Ésteres a partir de Aceite de Palma, empleando la Metodología de Superficie de Respuesta Optimization of the Alkyl Esters Production from Palm Oil using Response Surface Methodology

    Directory of Open Access Journals (Sweden)

    Paula C Mazo

    2008-01-01

    Full Text Available En el presente artículo se estudia el efecto del porcentaje másico del catalizador y la relación molar aceite:alcohol para diferentes sistemas de alcohol-catalizador, en la optimización de la producción de alquil ésteres de aceite crudo de palma. Se usó un diseño factorial 3² y la metodología de superficie de respuesta, donde se obtuvieron las ecuaciones polinomiales cuadráticas mediante análisis de regresión múltiple. La respuesta evaluada fue el porcentaje de conversión a glicerina empleando la norma de la Sociedad Americana de Químicos de Aceites, AOCS Ca 14-56. Las dos variables afectan significativamente la conversión y el efecto de la relación molar es mayor que el de la cantidad de catalizador. Las condiciones óptimas varían para cada sistema, pero en general para los catalizadores homogéneos el porcentaje másico del catalizador es menor (1 a 2% que para los heterogéneos (5 a 6% y se requieren altas relaciones molares (1:12 a 1:40. Las propiedades de los combustibles obtenidos cumplen con los requerimientos de los estándares americanos para el biodiesel.This paper studies the effect of the mass percentage of the catalyst and the molar ratio oil:alcohol for different alcohol-catalyst systems, in the optimization of alkyl esters production from crude palm oil. Factorial design 3² and response surface methodology were used and quadratic polynomial equations by a multiple regression analysis were obtained. The evaluated answer was the percentage of conversion to glycerine using the norm of the American Oil Chemists' Society, AOCS Ca 14-56. The two variables significantly affect the conversion and the molar ratio effect is larger than the effect of the amount of catalyst. Optimum conditions vary for each system, but in general for the homogeneous catalysts the mass percentage of the catalyst is smaller (1 to 2% than for heterogeneous (5 to 6% and large molar ratio are required (1:12-1:40. The properties of fuel

  2. Sulfur Chemistry in Combustion I

    DEFF Research Database (Denmark)

    Johnsson, Jan Erik; Glarborg, Peter

    2000-01-01

    Most fossil fuels contain sulphur and also biofuels and household waste have a sulphur content. As a consequence sulphur species will often be present in combustion processes. In this paper the fate and influence of fuel sulphur species in combustion will be treated. First a description...... of the sulphur compounds in fossil fuels and the possibilities to remove them will be given. Then the combustion of sulphur species and their influence on the combustion chemistry and especially on the CO oxidation and the NOx formation will be described. Finally the in-situ removal of sulphur in the combustion...

  3. Modelling of CWS combustion process

    Science.gov (United States)

    Rybenko, I. A.; Ermakova, L. A.

    2016-10-01

    The paper considers the combustion process of coal water slurry (CWS) drops. The physico-chemical process scheme consisting of several independent parallel-sequential stages is offered. This scheme of drops combustion process is proved by the particle size distribution test and research stereomicroscopic analysis of combustion products. The results of mathematical modelling and optimization of stationary regimes of CWS combustion are provided. During modeling the problem of defining possible equilibrium composition of products, which can be obtained as a result of CWS combustion processes at different temperatures, is solved.

  4. Combustion calorimetry experimental chemical thermodynamics

    CERN Document Server

    Sunner, Stig

    1979-01-01

    Combustion Calorimetry deals with expertise knowledge concerning the calorimetry of combustion reactions of an element or compound. After defining the use of units and physical constants, the book discusses the basic principles of combustion calorimetry and the various instruments and calorimeters used in the experiments to measure operations concerning temperatures and its time variations. One paper discusses the theory and design criteria of combustion calorimeter calibration. Another paper discusses the results obtained from a combustion calorimeter after it has measured the energy or entha

  5. Influencia del riego sobre la composición y características organolépticas del aceite de oliva

    Directory of Open Access Journals (Sweden)

    Salas, J.

    1997-04-01

    Full Text Available Fatty acidic composition, organoleptic characteristics and other quality parameters of virgin olive oils were evaluated in dry-farming and irrigated olive orchards. The acidic composition was affected by irrigation. The content in monoinsaturated and polunsaturated fatty acid was higher in the oils of the dry-farming olive orchard, while the relative content in saturated fatty acids was higher in the irrigated one. The insaturated/ saturated and oleic/linoleic relations distinguish the irrigated and non irrigated olive trees. The K225 values, the poliphenolic contents and the bitter taste were also correlated. The oils from non irrigated olive trees showed the higher bitter taste. Those three parameters discriminated the oils from irrigated and non irrigated trees. The bitter taste diminished when increasing the amount of water supplied with the irrigation.

    Se estudia la composición relativa en ácidos grasos, características organolépticas y parámetros de calidad de los aceites producidos en olivares de secano o regados con diferentes dosis de agua. La composición acídica fue alterada por el riego. El contenido en ácidos grasos monoinsaturados y poliinsaturados fue mayor en los aceites de secano, mientras que el contenido relativo en ácidos grasos saturados fue mayor en regadío. Las relaciones insaturados/saturados y oleico/linoleico diferencian los aceites de riego y de secano. Existió una relación entre los valores de K225, el contenido en polifenoles y el grado de amargor, siendo los aceites de secano mucho más amargos que los de riego, discriminando estos tres parámetros los aceites de riego y los de secano. El grado de amargor disminuyó al aumentar la cantidad de agua aportada con el riego.

  6. Efecto de la refinación física sobre la calidad química y sensorial del aceite de coco

    Directory of Open Access Journals (Sweden)

    Medina-Juárez, L. A.

    2009-03-01

    Full Text Available The effect of the physical refining stages (degumming, bleaching and deodorization on some coconut oil quality and sensory parameters was evaluated. The fatty acid profile was within the range reported for this oil. The free fatty acids level (FFA and the moisture content were significantly reduced (p 0.05 were found in p-anisidine value (AV. The tocopherols content was lower than the reported for this oil (6.57 ppm.The sterol level (899 ppm was similar to the level reported for this oil. Both tocopherols and sterols content were significantly reduced (p Se evaluó el efecto que tuvieron las etapas de la refinación física (desgomado, blanqueo y desodorización sobre algunos parámetros de calidad química y sensorial del aceite de coco. El perfil de ácidos grasos se encontró dentro de los intervalos reportados para este aceite. Los niveles de ácidos grasos libres (AGL y el contenido de humedad se redujeron significativamente (p 0.05 en ninguna de las etapas. El contenido de tocoferoles (6.57 ppm estuvo por debajo de lo reportado para aceite de coco. El nivel de esteroles (899 ppm determinado correspondió a lo reportado en la bibliografía. Tanto los tocoferoles como los esteroles se redujeron significativamente (p < 0.05 en todas las etapas de la refinación, siendo la etapa de blanqueo donde hubo mayor pérdida de estos compuestos. Se evaluó sensorialmente el aceite de coco usando una prueba con escalas. La calidad sensorial fue mejorada por el proceso de refinación. El aceite de coco desodorizado obtuvo la mejor calificación sensorial.

  7. Actividad antimicótica in vitro y metabolitos del aceite esencial de las hojas de Minthostachys Mollis (muña

    Directory of Open Access Journals (Sweden)

    Carlos Cano

    2008-07-01

    Full Text Available Objetivos. Demostrar la actividad antimicótica in vitro y la elucidación de algunos de los metabolitos del aceite esencial de hojas de Minthostachys mollis (muña proveniente del distrito de Huacrapuquio (2700 msnm, Junín. Materiales y métodos. El aceite esencial se obtuvo por el método de destilación por arrastre de vapor de agua. Este fue sometido a análisis físico-químico y determinación de la composición química mediante cromatografía de gases. Mediante el método de agar en difusión se evaluó la inhibición del crecimiento fúngico de Candida albicans y también por el método de dilución en tubo para Trichophytun tonsurans, Trichophytun mentagrophytes, Microsporun canis. Resultados. Se encontraron los siguientes monoterpenos: pulegona, mentona, limoneno y mirceno. El aceite esencial de muña inhibió completamente el desarrollo de T. tonsurasn, T. mentagrophytes y M. canis con ambos métodos de evaluación y dosis, para C. albicans se logró un halo de inhibición de 30 mm para el aceite esencial al 100% y de 35 mm al 50%. Conclusiones. Se demostró la actividad antimicótica del aceite esencial de muña, probablemente por la acción de los monoterpenos encontrados.

  8. Efecto de la fertilización nitrogenada en el rendimiento y la composición de los aceites esenciales de especies y accesiones de Lippia

    Directory of Open Access Journals (Sweden)

    érika Leonor Zambrano M

    2013-04-01

    Full Text Available En el Centro Experimental de la Universidad Nacional de Colombia sede Palmira (CEUNP se evaluó el efecto de la aplicación de nitrógeno (N en la producción de materia seca y aceites esenciales de dos especies de Lippia. Se utilizaron las accesiones Cítrica y Típica de Lippia alba (Miller N.E.Brown ex Britton & Wilson y Patía, Típica y Cítrica de L. origanoides H.B.K. Como fuentes de N se aplicaron gallinaza y urea en dosis equivalentes de 50 y 100 kg/ha de N. Se utilizó un diseño experimental de bloques completos al azar, con cinco tratamientos y tres repeticiones para cada accesión. Se evaluaron los rendimientos de biomasa fresca y seca (MS y de los aceites esenciales y su composición por arrastre de vapor en hojas secas. Los mayores rendimientos de MS y de aceite esencial (3.318 kg/ha y 82.9 lt/ha, respectivamente se obtuvieron con las accesiones de L origanoides. La mayor concentración de aceite esencial (4 ml/100 g se registró en L. origanoides Patía con la aplicación de 100 kg/ha de N como urea. Las diferencias en la composición química de los aceites estuvieron más asociadas con la especie y accesión que con la aplicación de N.

  9. “elaboración de un proyecto para la comercialización del aceite de jengibre y su uso en la elaboración de pasteles en la ciudad de Guayaquil”

    OpenAIRE

    2010-01-01

    El aceite de Jengibre es altamente nutritivo y energético. Se ha realizado un estudio de mercado que establece que hay gran potencial para la utilización el aceite de Jengibre en la ciudad de Guayaquil, sin embargo no se ha hecho ningún esfuerzo para poder realizar la comercialización en los distintos mercados de la ciudad. De hacerlo correctamente, se podría potencializar a las industrias para que de esta manera se dedique a la producción del aceite de jengibre. La gran cantidad de recurs...

  10. El papel de Fedepalma y Procolombia en la competitividad de las exportaciones de aceite de palma africana de Colombia hacia Alemania después de la firma del acuerdo comercial con la Unión Europea

    OpenAIRE

    Gutiérrez Delgado, Ximena

    2016-01-01

    Este estudio de caso tiene como objetivo principal determinar el papel que desarrollan Fedepalma (Federación Nacional de Cultivadores de Palma de Aceite) y Procolombia en la competitividad de las exportaciones de aceite de palma de Colombia hacia Alemania, después de la firma del Acuerdo Comercial con la Unión Europea. Con este fin, este estudio presenta una descripción tanto del Sector Palma de Aceite y su relevancia en la agroindustria colombiana, como del mercado nacional e ...

  11. Influencia de la salinidad edáfica sobre la calidad del aceite de oliva cv. Arbequina

    Directory of Open Access Journals (Sweden)

    Aragüés, R.

    2005-03-01

    Full Text Available This work analyzes the effect of soil salinity on olive oil quality. The chemical composition of oils extracted from young ‘Arbequina' olives subject in the field to three soil salinity levels (low-L, medium-M and high-H was determined throughout a period of three years. A total of 30 parameters were analyzed (moisture, oil content, acidity, peroxides, ultraviolet absorbances, poliphenols, aliphatic alcohols, sterols, waxes, and fatty acid composition. Soil salinity was measured on fourteen different dates with an electromagnetic sensor. Overall, salinity increased oil content (+15 % in H with respect to L and decreased aliphatic alcohols (-29 % and palmitoleic acid (-32 % (values significant at P0,05. In summary, olive oil quality was practically independent of soil salinity and, according to the prevailing legislation, all the oils were classified as “extra virgin”.Este trabajo analiza el efecto de la salinidad edáfica sobre la calidad del aceite de oliva. Durante tres campañas se determinó la composición química de aceites provenientes de olivos jóvenes ‘Arbequina' sujetos en campo a tres niveles de salinidad (baja-B, media-M y alta-A. En total se analizaron 30 parámetros (humedad, grasa, acidez, peróxidos, lecturas en el ultravioleta, polifenoles, alcoholes alifáticos, esteroles, ceras y composición de ácidos grasos. La salinidad edáfica se midió en catorce fechas con un sensor electromagnético. La salinidad produjo un aumento del porcentaje de grasa (+15 % en A respecto a B, y un descenso de los alcoholes alifáticos (-29 % y del ácido palmitoleico (-32 % (valores significativos a P0,05. En conclusión, la calidad del aceite de oliva fue prácticamente independiente de la salinidad, clasificándose en todos los casos como “virgen extra” según la normativa vigente.

  12. A kinetic model of carbon burnout in pulverized coal combustion

    Energy Technology Data Exchange (ETDEWEB)

    Hurt, R.; Jian-Kuan Sun; Lunden, M. [Brown University, Providence, RI (United States). Division of Engineering

    1998-04-01

    The degree of carbon burnout is an important operating characteristic of full-scale suspension-fired coal combustion systems affecting boiler efficiency, electrostatic precipitator operation and the value of fly ash as a saleable product. Prediction of carbon loss requires special char combustion kinetics valid through the very high conversions targeted in industry (typically {gt} 99.5%), and valid for a wide-range of particle temperature histories occurring in full-scale furnaces. The paper presents high-temperature kinetic data for five coal chars in the form of time-resolved burning profiles that include the late stages of combustion. It then describes the development and validation of the Carbon Burnout Kinetic Model (CBK), a coal-general kinetics package that is specifically designed to predict the total extent of carbon burnout and ultimate fly ash carbon content for prescribed temperature/oxygen histories typical of pulverized coal combustion systems. The model combines the single-film treatment of cha oxidation with quantitative descriptions of thermal annealing, statistical kinetics, statistical densities, and ash inhibition in the late stages of combustion. In agreement with experimental observations, the CBK model predicts (1) low reactivities for unburned carbon residues extracted from commercial ash samples, (2) reactivity loss in the late stages of laboratory combustion, (3) the observed sensitivity of char reactivity to high-temperature heat treatment on second and subsecond time scales, and (4) the global reaction inhibition by mineral matter in the late stages of combustion observed in single-particle imaging studies. The model ascribes these various char deactivation phenomena to the combined effects of thermal annealing, ash inhibition, and the preferential consumption of more reactive particles (statistical kinetics), the relative contributions of which vary greatly with combustion conditions. 39 refs., 4 figs., 4 tabs., 1 app.

  13. Introducción a la hidrogenación de aceite y su implementación en un proceso supercrítico: caso del aceite de girasol

    Directory of Open Access Journals (Sweden)

    Ajzenberg, Nancy

    2002-06-01

    Full Text Available With 25 millions tons per year, the hydrogenated oil production is on the top in the food market. In this review we deal with the sunflower seed oil hydrogenation with special attention to the economy of the product, the reaction kinetic and parameters studies (like reactor, isomers production, catalyst. Furthermore we point out the necessities to use a new process considering ecological, safety and economic requirements. Then, using new catalysts based on Pt (instead of Ni and a supercritical solvent, the trans isomers level can be reduced. Furthermore, the supercritical technology improves the process regarding reaction rate and solvent treatment.Con 25 millones de toneladas al año, la producción de aceite hidrogenado tiene su sitio en el mercado de la alimentación. Este artículo trata de la hidrogenación del aceite de girasol pasando por la economía del producto, la cinética de la reacción y el estudio de parámetros (como el reactor, la producción de isómeros, el catalizador y explícita las necesidades de usar un nuevo proceso para cumplir normas ecológicas, sanitarias y económicas. Así, utilizando nuevos catalizadores de platino (en vez de níquel y un solvente supercrítico, se baja la cantidad de isómeros trans producidos, que son nefastos para la salud. Además, la tecnología supercrítica mejora el proceso sobre todo del punto de vista de la reacción y del tratamiento del solvente.

  14. Time Resolved FTIR Analysis of Combustion of Ethanol and Gasoline Combustion in AN Internal Combustion Engine

    Science.gov (United States)

    White, Allen R.; Sakai, Stephen; Devasher, Rebecca B.

    2011-06-01

    In order to pursue In Situ measurements in an internal combustion engine, a MegaTech Mark III transparent spark ignition engine was modified with a sapphire combustion chamber. This modification will allow the transmission of infrared radiation for time-resolved spectroscopic measurements by an infrared spectrometer. By using a Step-scan equipped Fourier transform spectrometer, temporally resolved infrared spectral data were acquired and compared for combustion in the modified Mark III engine. Measurements performed with the FTIR system provide insight into the energy transfer vectors that precede combustion and also provides an in situ measurement of the progress of combustion. Measurements were performed using ethanol and gasoline.

  15. Análisis de biodiesel preparado a partir de residuos de aceite doméstico, mediante RMN.

    OpenAIRE

    Cedron, Torres, Juan Carlos; Universidad de Ingeniería y Tecnología - UTEC; Perú

    2014-01-01

    Publicado en Revista Sociedad Química del Perú el 14/02/2014 Se preparó biodiesel a partir de residuos de aceite doméstico, mediante la reacción de transesterificación usando etanol. El rendimiento de la reacción fue del 78%, y el producto obtenido fue caracterizado por sus propiedades fisicoquímicas. Un análisis detallado del espectro de 1H-RMN permitió calcular que la conversión de triglicéridos en ésteres monoalquilados fue del 98,82%, lo cual indica que el biodiesel tiene la calidad re...

  16. Niveles de calcio, magnesio, manganeso, zinc, selenio y cromo en aceites de oliva comercializados en Andalucía

    Directory of Open Access Journals (Sweden)

    López, M.a Carmen

    2000-12-01

    Full Text Available We determined the presence of Ca, Mg, Mn, Zn, Se and Cr in 64 samples of olive virgin oil, olive oil and marc oil produced in Andalusia, southern Spain. Flame atomization atomic absorption spectroscopy was used for Ca and Mg, and the electrothermal atomization mode was used for Mn, Zn, Se and Cr. Samples were previously ashed with HNO3 and V2O5. Analytical conditions were optimized to control for interference and to obtain appropriate accuracy and precision factors. The method is potentially useful for quality control of olive oils. The concentrations ranged from 0.055 to 2.725 mg/kg for Ca; 0.300 to 5.300 mg/kg for Mg, 13.213 to 296.356 mg/kg for Mn, 8.758 to 36.575 mg/kg for Zn, undetectable to 178.515 mg/kg for Se, and undetectable to 41.510 mg/kg for Cr. No statistically significant differences were found between the three types of oil in the concentrations of these elements. There were significant correlations between the concentrations of the pairs Se-Cr, Mn-Cr, Mg-Zn, Ca-Zn and Ca-Cr. Because of the high intake of olive oil in our setting, this food can be considered a major source of essential elemental nutrients.En el presente trabajo se ha determinado la presencia de Ca, Mg, Mn, Zn, Se y Cr en 64 muestras de aceite de oliva virgen, de oliva y de orujo de oliva producidos en Andalucía. La técnica analítica empleada ha sido la espectroscopía de absorción atómica con atomización de llama para Ca y Mg, y con atomización electrotérmica para Mn, Zn, Se y Cr. Las muestras han sido sometidas previamente a mineralización ácida con HNO3 y V2O5. Se han optimizado las condiciones analíticas que permiten controlar interferencias y obtener factores de exactitud y precisión adecuados. El método propuesto resulta útil en control de calidad de aceites. Los valores obtenidos de Ca oscilan entre 0.055-2.725 mg/kg, de Mg entre 0.300-5.300 mg/kg, de Mn 13.213-296.356 mg/kg, de Zn entre 8.758-36.575 mg/kg, de Se entre no detectable -178

  17. Aerosols from biomass combustion

    Energy Technology Data Exchange (ETDEWEB)

    Nussbaumer, T.

    2001-07-01

    This report is the proceedings of a seminar on biomass combustion and aerosol production organised jointly by the International Energy Agency's (IEA) Task 32 on bio energy and the Swiss Federal Office of Energy (SFOE). This collection of 16 papers discusses the production of aerosols and fine particles by the burning of biomass and their effects. Expert knowledge on the environmental impact of aerosols, formation mechanisms, measurement technologies, methods of analysis and measures to be taken to reduce such emissions is presented. The seminar, visited by 50 participants from 11 countries, shows, according to the authors, that the reduction of aerosol emissions resulting from biomass combustion will remain a challenge for the future.

  18. SIMULACIÓN METABÓLICA DE LA BIODEGRADACIÓN DE ACEITES DIELÉCTRICOS USANDO SISTEMAS EXPERTO

    Directory of Open Access Journals (Sweden)

    EDISON ALEXANDER AGUDELO

    2011-01-01

    Full Text Available La rápida industrialización y la acelerada producción de nuevos compuestos sintéticos han llevado a los gobiernos y entidades de control a regular de forma estricta los vertimientos de efluentes industriales. Sin embargo, con decenas de nuevos compuestos generados cada año, es imposible establecer protocolos de tratabilidad y estimar su impacto directo en los ecosistemas antes de su producción en industria. El uso de sistemas de predicción de rutas metabólicas permite estimar de forma preliminar las posibles transformaciones que un compuesto complejo puede sufrir como resultado de su interacción con ecosistemas, dando un indicio de la facilidad del tratamiento biológico y su riesgo para a salud del medio ambiente. En este trabajo se presenta la simulación de la biodegradación de tres compuestos de referencia presentes en tierra Fuller contaminada con aceites dieléctricos, con el ánimo de estimar su biodegradabilidad y la posible generación de intermediarios tóxicos. Para cada compuesto se identificaron sus principales transformaciones, así como las enzimas involucradas y los posibles microorganismos que propician estas transformaciones. Se comprobó que los contaminantes pueden ser biodegradados completamente y que no se generan intermediarios tóxicos de importancia, con lo cual se confirma la factibilidad del tratamiento biológico para aceites dieléctricos.

  19. Comportamiento reológico no estacionario de emulsiones aceite en agua estabilizadas con un palmitato de sacarosa.

    Directory of Open Access Journals (Sweden)

    Partal, P.

    1997-12-01

    Full Text Available Non-steady flow properties of concentrated oil in water emulsions containing oil (60-80% wt., water and sucrose palmitate (1-5% wt. of high hydrophilic-lypophilic balance were investigated. Stress growth, steady flow and linear viscoelastic measurements were carried out for this study. The emulsions studied exhibited a thixotropic behavior showing a very rapid stress overshoot. The stress decay was fitted to a Figoni-Shoemaker model using two exponentials. An stress undershoot was also produced under certain conditions. Shear brought about strong structural changes, such as droplet size redistribution at high oil content and temperature. Thus, the steady state viscosity does not fit an Arrhenius type equation with temperature. A shear thinning behavior was found for the steady state viscosity and the peak viscosity.

    Se han estudiado emulsiones de calidad alimentaria aceite en agua estabilizadas por un palmitato de sacarosa de HLB=15. Dichas emulsiones se fabricaron a concentraciones comprendidas entre el 60 y el 80% (p/p en peso de aceite vegetal con un 1-5% (p/p en peso del sucroéster empleado como emulsionante. Para llevar a cabo este estudio se realizaron ensayos de crecimiento del esfuerzo, flujo estacionario y cizalla oscilatoria. Todos los sistemas estudiados presentan un comportamiento tixotrópico en flujo transitorio. Bajo determinadas condiciones, la cizalla puede hacer que el esfuerzo vuelva a aumentar con el tiempo tras haber alcanzado un valor pseudoestacionario. Este hecho se ha relacionado con una redistribución de tamaños de gota como consecuencia de la cizalla. Como resultado, la cizalla provoca una intensa destrucción estructural en los sitemas estudiados, no pudiéndose ajusfar la ecuación de Arrhenius a todo el Intervalo de temperaturas estudiado.

  20. Combustible Cartridge Case Characterization

    Science.gov (United States)

    1984-02-01

    University (NYU) has resulted in the selection of two cross-linked melamine / formaldehyde acrylic styrene resin systems that can be used in the beater additive... melamine resin Akaradit II stabilizer 20. ABSTRACT (con) Test coupons of combustible cartridge case material were fabricated using these recommended...and agitated for 30 min before the pH was slowly lowered to 3 with p-toluene sulfonic acid. In order to maintain this pH in the felting tank, it was

  1. Combustion science and engineering

    CERN Document Server

    Annamalai, Kalyan

    2006-01-01

    Introduction and Review of Thermodynamics Introduction Combustion Terminology Matter and Its Properties Microscopic Overview of Thermodynamics Conservation of Mass and Energy and the First Law of Thermodynamics The Second Law of Thermodynamics Summary Stoichiometry and Thermochemistry of Reacting Systems Introduction Overall Reactions Gas Analyses Global Conservation Equations for Reacting Systems Thermochemistry Summary Appendix Reaction Direction and Equilibrium Introduction Reaction Direction and Chemical Equilibrium Chemical Equilibrium Relations Vant Hoff Equation Adi

  2. Combustion Characteristics of Sprays

    Science.gov (United States)

    1989-08-01

    regarded by implication or otherwise, or in any way licensing the holder or any other person or corporation, or conveying any rights or permission to...00 _’N 1. TI TLE inctuat Security CZaaafication5 Combustion Characteristics of Sprays 12. PERSONAL AUTHOR(S) Sohrab, Siavash H. 13& TYPE OF REPORT...to ?!HF of rich butane/air 3unsen flames. .lso, the rotacion speed and :he oerodic temDeracure fluc:uations of rotacfng ?HF are examined. :’!naily

  3. High Gravity (g) Combustion

    Science.gov (United States)

    2006-02-01

    required thrust-to-weight ratio goals. Shorter residence times in the combustion chamber may reduce the NOx emissions, but the CO and UHC emissions then...Emissions analyzing equipment is available to detect CO, CO2, NOx, O2, and total unburned hydrocarbons ( UHC ) at the combustor exit plane. Emissions... UHC ) emissions along with the CO data, as seen in Fig. 24, shows that Configuration 1 had much higher UHC levels. The reactions from hydrocarbons to

  4. Reburning Characteristics of Residual Carbon in Fly Ash from CFB Boilers

    Science.gov (United States)

    Zhang, S. H.; Luo, H. H.; Chen, H. P.; Yang, H. P.; Wang, X. H.

    The content of residual carbon in fly ash of CFB boilers is a litter high especially when low-grade coal, such as lean coal, anthracite coal, gangue, etc. is in service, which greatly influences the efficiency of boilers and fly ash further disposal. Reburn of fly ash through collection, recirculation in CFB furnace or external combustor is a possibly effective strategy to decrease the carbon content, mainly depending on the residual carbon reactivity. In this work, the combustion properties of residual carbon in fly ash and corresponding original coal from large commercial CFB boilers (Kaifeng (440t/h), and Fenyi (410t/h), all in china) are comparably investigated through experiments. The residual carbon involved was firstly extracted and enriched from fly ash by means of floating elutriation to mitigate the influence of ash and minerals on the combustion behavior of residual carbon. Then, the combustion characteristic of two residual carbons and the original coal particles was analyzed with thermogravimetric analyzer (TGA, STA409C from Nestch, Germany). It was observed that the ignition temperature of the residual carbon is much higher than that of original coal sample, and the combustion reactivity of residual carbon is not only dependent on the original coal property, but also the operating conditions. The influence of oxygen content and heating rate was also studied in TGA. The O2 concentration is set as 20%, 30%, 40% and 70% respectively in O2/N2 gas mixture with the flow rate of 100ml/min. It was found that higher oxygen content is favor for decreasing ignition temperature, accelerating the combustion rate of residual carbon. And about 40% of oxygen concentration is experimentally suggested as an optimal value when oxygen-enriched combustion is put into practice for decreasing residual carbon content of fly ash in CFB boilers.

  5. The Diesel Combustion Collaboratory: Combustion Researchers Collaborating over the Internet

    Energy Technology Data Exchange (ETDEWEB)

    C. M. Pancerella; L. A. Rahn; C. Yang

    2000-02-01

    The Diesel Combustion Collaborator (DCC) is a pilot project to develop and deploy collaborative technologies to combustion researchers distributed throughout the DOE national laboratories, academia, and industry. The result is a problem-solving environment for combustion research. Researchers collaborate over the Internet using DCC tools, which include: a distributed execution management system for running combustion models on widely distributed computers, including supercomputers; web-accessible data archiving capabilities for sharing graphical experimental or modeling data; electronic notebooks and shared workspaces for facilitating collaboration; visualization of combustion data; and video-conferencing and data-conferencing among researchers at remote sites. Security is a key aspect of the collaborative tools. In many cases, the authors have integrated these tools to allow data, including large combustion data sets, to flow seamlessly, for example, from modeling tools to data archives. In this paper the authors describe the work of a larger collaborative effort to design, implement and deploy the DCC.

  6. Internal combustion engine using premixed combustion of stratified charges

    Science.gov (United States)

    Marriott, Craig D.; Reitz, Rolf D. (Madison, WI

    2003-12-30

    During a combustion cycle, a first stoichiometrically lean fuel charge is injected well prior to top dead center, preferably during the intake stroke. This first fuel charge is substantially mixed with the combustion chamber air during subsequent motion of the piston towards top dead center. A subsequent fuel charge is then injected prior to top dead center to create a stratified, locally richer mixture (but still leaner than stoichiometric) within the combustion chamber. The locally rich region within the combustion chamber has sufficient fuel density to autoignite, and its self-ignition serves to activate ignition for the lean mixture existing within the remainder of the combustion chamber. Because the mixture within the combustion chamber is overall premixed and relatively lean, NO.sub.x and soot production are significantly diminished.

  7. Issues in waste combustion

    Energy Technology Data Exchange (ETDEWEB)

    Gustavsson, Lennart; Robertson, Kerstin; Tullin, Claes [Swedish National Testing and Research Inst., Boraas (Sweden); Sundquist, Lena; Wrangensten, Lars [AaF-Energikonsult AB, Stockholm (Sweden); Blom, Elisabet [AaF-Processdesign AB, Stockholm (Sweden)

    2003-05-01

    The main purpose of this review is to provide an overview of the state-of-the-art on research and development issues related to waste combustion with relevance for Swedish conditions. The review focuses on co-combustion in grate and fluidised bed furnaces. It is primarily literature searches in relevant databases of scientific publications with to material published after 1995. As a complement, findings published in different report series, have also been included. Since the area covered by this report is very wide, we do not claim to cover the issues included completely and it has not been possitile to evaluate the referred studies in depth. Basic knowledge about combustion issues is not included since such information can be found elsewhere in the literature. Rather, this review should be viewed as an overview of research and development in the waste-to-energy area and as such we hope that it will inspire scientists and others to further work in relevant areas.

  8. Internal combustion piston engines

    Energy Technology Data Exchange (ETDEWEB)

    Segaser, C.L.

    1977-07-01

    Current worldwide production of internal combustion piston engines includes many diversified types of designs and a very broad range of sizes. Engine sizes range from a few horsepower in small mobile units to over 40,000 brake horsepower in large stationary and marine units. The key characteristics of internal combustion piston engines considered appropriate for use as prime movers in Integrated Community Energy Systems (ICES) are evaluated. The categories of engines considered include spark-ignition gas engines, compression-ignition oil (diesel) engines, and dual-fuel engines. The engines are evaluated with respect to full-load and part-load performance characteristics, reliability, environmental concerns, estimated 1976 cost data, and current and future status of development. The largest internal combustion piston engines manufactured in the United States range up to 13,540 rated brake horsepower. Future development efforts are anticipated to result in a 20 to 25% increase in brake horsepower without increase in or loss of weight, economy, reliability, or life expectancy, predicated on a simple extension of current development trends.

  9. Development of flameless combustion; Desarrollo de la combustion sin flama

    Energy Technology Data Exchange (ETDEWEB)

    Flores Sauceda, M. Leonardo; Cervantes de Gortari, Jaime Gonzalo [Universidad Nacional Autonoma de Mexico, Mexico, D.F. (Mexico)]. E-mail: 8344afc@prodigy.net.mx; jgonzalo@servidor.unam.mx

    2010-11-15

    The paper intends contribute to global warming mitigation joint effort that develops technologies to capture the CO{sub 2} produced by fossil fuels combustion and to reduce emission of other greenhouse gases like the NO{sub x}. After reviewing existing combustion bibliography is pointed out that (a) touches only partial aspects of the collective system composed by Combustion-Heat transfer process-Environment, whose interactions are our primary interest and (b) most specialists think there is not yet a clearly winning technology for CO{sub 2} capture and storage. In this paper the study of combustion is focused as integrated in the aforementioned collective system where application of flameless combustion, using oxidant preheated in heat regenerators and fluent gas recirculation into combustion chamber plus appropriated heat and mass balances, simultaneously results in energy saving and environmental impact reduction. [Spanish] El trabajo pretende contribuir al esfuerzo conjunto de mitigacion del calentamiento global que aporta tecnologias para capturar el CO{sub 2} producido por la combustion de combustibles fosiles y para disminuir la emision de otros gases invernadero como NOx. De revision bibliografica sobre combustion se concluye que (a) trata aspectos parciales del sistema compuesto por combustion-proceso de trasferencia de calor-ambiente, cuyas interacciones son nuestro principal interes (b) la mayoria de especialistas considera no hay todavia una tecnologia claramente superior a las demas para captura y almacenaje de CO{sub 2}. Se estudia la combustion como parte integrante del mencionado sistema conjunto, donde la aplicacion de combustion sin flama, empleando oxidante precalentado mediante regeneradores de calor y recirculacion de gases efluentes ademas de los balances de masa y energia adecuados, permite tener simultaneamente ahorros energeticos e impacto ambiental reducido.

  10. Field Test Kit for Gun Residue Detection

    Energy Technology Data Exchange (ETDEWEB)

    WALKER, PAMELA K.; RODACY, PHILIP J.

    2002-01-01

    One of the major needs of the law enforcement field is a product that quickly, accurately, and inexpensively identifies whether a person has recently fired a gun--even if the suspect has attempted to wash the traces of gunpowder off. The Field Test Kit for Gunshot Residue Identification based on Sandia National Laboratories technology works with a wide variety of handguns and other weaponry using gunpowder. There are several organic chemicals in small arms propellants such as nitrocellulose, nitroglycerine, dinitrotoluene, and nitrites left behind after the firing of a gun that result from the incomplete combustion of the gunpowder. Sandia has developed a colorimetric shooter identification kit for in situ detection of gunshot residue (GSR) from a suspect. The test kit is the first of its kind and is small, inexpensive, and easily transported by individual law enforcement personnel requiring minimal training for effective use. It will provide immediate information identifying gunshot residue.

  11. Numerical Simulation Study of Goaf Methane Drainage and Spontaneous Combustion Coupling

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    In order to study the coupling problem between methane drainage and spontaneous combustion of residual coal in the collapsed zone after mining ignitable coal seams with high methane, we have analyzed the effects of different methane drainage modes on spontaneous combustion of residual coal through numerical simulation.The results show that deep and large flux methane drainage modes increases the air leakage from work faces to the goaf and formed new spontaneous combustion zones induced by drainage near vents, which increases the risk of self-ignition of coal-reducing the self-ignition period and enlarging the scale of self-ignition.The spontaneous upstream combustion oxidation of the main fire zone can be suppressed when both drainage and nitrogen injection were adopted.Our research results provide an effective technical measure and theoretical basis to determine the best methane drainage scheme and drainage parameters.

  12. ANÁLISIS PRELIMINAR DEL TRATAMIENTO FISICOQUÍMICO Y BIOLÓGICO DEL ACEITE DIELÉCTRICO PRESENTE EN TIERRA FULLER

    Directory of Open Access Journals (Sweden)

    EDISON ALEXANDER AGUDELO

    2011-01-01

    Full Text Available Este estudio evalúa dos tecnologías: una físico-química y otra biológica, que buscan eliminar la contaminación por el aceite dieléctrico presente en la tierra Fuller, Buscando con ello gestionar de forma ambientalmente adecuada este residuo peligroso. Para la Tecnología físico-química, se usó hexano como solvente y se alcanzó de manera preliminar remociones del aceite dieléctrico del orden del 87% en la tierra Fuller tratada, con una relación tierra Fuller: solvente de 1:8 p/v, una velocidad de agitación de 100 rpm y un tiempo de contacto de 30 minutos. La calidad del aceite dieléctrico recuperado no es apta para su uso en equipos eléctricos, por su baja rigidez dieléctrica, baja densidad y color desfavorable. La tierra Fuller recuperada alcanzó una densidad aparente de 0.623 gr/ml, una densidad real de 2.231 gr/ml y una porosidad de 72.075 %, lo que indica al menos preliminarmente que dicha tierra está muycercana en sus características físicas a la tierra fuller limpia. Para la tecnología biológica se trató la tierra contaminada en un reactor biológico de tierra activada, evaluando la velocidad de agitación y el tiempo de degradación necesario para alcanzar niveles de contaminación adecuados que permitan disponer el residuo en un relleno sanitario convencional sin riesgo para la salud de los ecosistemas y el ser humano, esta fase aún se encuentra en experimentación y los resultados dependen del análisis cromatográfi co del aceite dieléctrico que permanece en la tierra Fuller tratada, en el cual se hará el seguimiento de 10 especies que son clave dentro de este producto, debido a su cantidad y/o toxicidad , falta comprobar la calidad química de la tierra fuller y del aceite dieléctrico recuperados en el tratamiento físico-químico, y validar el proceso biológico para degradar el aceite dieléctrico.

  13. El aceite de oliva virgen y la distribución y movimiento transmembrana del colesterol en la membrana de eritrocito humano

    Directory of Open Access Journals (Sweden)

    Muriana, F. J. G.

    1998-04-01

    Full Text Available The influence of virgin olive oil intake (with regard to the ingestion of high-oleic sunflower oil on cholesterol distribution and transbilayer movement in the erythrocyte membrane of healthy subjects and hypertensive patients (with or without concomitant hypercholesterolaemia was studied. The activity of erythrocyte sodium-lithium countertransport and blood pressure were also determined. The study was conducted over two 4-week periods, with a washout (4-week period between both monounsaturated diets. Olive oil (but not high-oleic sunflower oil was able to reduce the erythrocyte sodium-lithium countertransport activity, to normalize the erythrocyte membrane cholesterol distribution and transbilayer movement, and to significantly diminish the systolic and diastolic Wood pressures in hypertensive patients. Our data indicate that olive oil enriched-diet may modulate and/or partially prevent the alteration of those pathogenic parameters related to human hypertension and Cardiovascular Pathology. These processes cannot be exclusively ascribed to the content of oleic acid in virgin olive oil.

    Se estudió el efecto de la ingesta de aceite de oliva virgen (en comparación con la ingesta de aceite de girasol alto-oleico sobre la distribución del colesterol y su movimiento entre las monocapas externa e interna de la membrana de eritrocito de sujetos sanos y pacientes hipertensos (normo- e hipercolesterolémicos. También se determinaron la actividad del contratransporte sodio-litio en eritrocito y la presión arterial. Cada período de la intervención dietética tuvo una duración de 4 semanas, con 4 semanas de «lavado» (retomo a la dieta basal entre las dietas monoinsaturadas. El aceite de oliva virgen (pero no el aceite de girasol alto-oleico fue capaz de reducir la actividad anormalmente alta del contratransporte sodio-litio, de normalizar la distribución del colesterol y velocidad de movimiento transmembrana, y de reducir

  14. Estabilidad oxidativa y contenido de tocoferoles en el aceite de canola extraído con CO2 supercrítico

    Directory of Open Access Journals (Sweden)

    Grompone, Maria A.

    2006-06-01

    Full Text Available In this work the characteristics of canola seed oil extracted using supercritical CO2 under different conditions and its oxidative stability were analyzed and compared with those corresponding to the oil extracted with hexane. The oil with the lower oxidative stability was that extracted at 276 Kg/cm2. All the oils extracted with supercritical CO2 showed a lower oxidative stability than the oil obtained by hexane extraction. Although the hexane extracted oil did not show a significant difference in its tocopherol concentration, its carotenoid concentration was the highest, which could be a reason for the higher oxidative stability of that oil. The oil extraction rate was constant during the whole extraction period, but the rate of tocopherol extraction was higher at the beginning of the process, which suggests a possible co-solvent effect of the oil itself on these compounds.En este trabajo se analizan las características del aceite extraído de semillas de canola usando CO2 supercrítico en diferentes condiciones de operación y su estabilidad oxidativa, comparándolas con las correspondientes a las del aceite extraído con hexano. Entre los aceites extraídos con CO2 supercrítico el que presentó una menor estabilidad oxidativa y un menor contenido de tocoferoles fue el extraído a 276 Kg/cm2. En todos los casos los aceites extraídos por este método resultaron menos estables que el extraído con hexano. Aunque este último no presentó un contenido en tocoferoles sustancialmente diferente al de los primeros, mostró un contenido de carotenoides superior, lo que podría estar explicando su mayor estabilidad oxidativa. Si bien la velocidad de extracción del aceite fue constante durante todo el proceso, los tocoferoles mostraron una mayor velocidad de extracción al inicio que al final del mismo, lo que sugiere un posible efecto co-solvente del propio aceite sobre ellos.

  15. Optical Study of Flow and Combustion in an HCCI Engine with Negative Valve Overlap

    Science.gov (United States)

    Wilson, Trevor S.; Xu, Hongming; Richardson, Steve; Wyszynski, Miroslaw L.; Megaritis, Thanos

    2006-07-01

    One of the most widely used methods to enable Homogeneous Charge Compression Ignition (HCCI) combustion is using negative valve overlapping to trap a sufficient quantity of hot residual gas. The characteristics of air motion with specially designed valve events having reduced valve lift and durations associated with HCCI engines and their effect on subsequent combustion are not yet fully understood. In addition, the ignition process and combustion development in such engines are very different from those in conventional spark-ignition or diesel compression ignition engines. Very little data has been reported concerning optical diagnostics of the flow and combustion in the engine using negative valve overlapping. This paper presents an experimental investigation into the in-cylinder flow characteristics and combustion development in an optical engine operating in HCCI combustion mode. PIV measurements have been taken under motored engine conditions to provide a quantitative flow characterisation of negative valve overlap in-cylinder flows. The ignition and combustion process was imaged using a high resolution charge coupled device (CCD) camera and the combustion imaging data was supplemented by simultaneously recorded in-cylinder pressure data which assisted the analysis of the images. It is found that the flow characteristics with negative valve overlapping are less stable and more valve event driven than typical spark ignition in-cylinder flows, while the combustion initiation locations are not uniformly distributed.

  16. Mechanical durability and combustion characteristics of pellets from biomass blends

    Energy Technology Data Exchange (ETDEWEB)

    Gil, M.V.; Oulego, P.; Casal, M.D.; Pevida, C.; Pis, J.J.; Rubiera, F. [CSIC, Oviedo (Spain)

    2010-11-15

    Biofuel pellets were prepared from biomass (pine, chestnut and eucalyptus sawdust, cellulose residue, coffee husks and grape waste) and from blends of biomass with two coals (bituminous and semianthracite). Their mechanical properties and combustion behaviour were studied by means of an abrasion index and thermogravimetric analysis (TGA), respectively, in order to select the best raw materials available in the area of study for pellet production. Chestnut and pine sawdust pellets exhibited the highest durability, whereas grape waste and coffee husks pellets were the least durable. Blends of pine sawdust with 10-30% chestnut sawdust were the best for pellet production. Blends of cellulose residue and coals (<20%) with chestnut and pine sawdusts did not decrease pellet durability. The biomass/biomass blends presented combustion profiles similar to those of the individual raw materials. The addition of coal to the biomass in low amounts did not affect the thermal characteristics of the blends.

  17. Caracterización de los aceites crudo, neutro y decolorado de la pulpa y cascara de la fruta silvestre Paraqueiba sericea tulasne «Umarí».

    Directory of Open Access Journals (Sweden)

    Chasquibol Silva, Nancy A.

    1997-02-01

    Full Text Available Crude, neutro and blenched oil extracted from pulp and peel of jungle fruit Paraqueiba sericea tulasne «Umarí» were studied. The crude oil was extracted with hexane by the soxhlet method giving a 47.86% yield, a 31.72% yield in neutro oil and a 94.89% yield in blenched oil. Chemical and physical constants were determined. In addition, five methyl esters of fatty acids were quantitatively determined by GLC using DEGS as stationary phase. The results indicated that Umarí oil belongs to a not drying type with a high content of unsaturated fatty acids principaly oleic. The analytical values obtained confirm the convenience of using Umarí oil in food and cosmetic industries.

    Se estudian los aceites crudo, neutro y decolorado del fruto del Umarí. La extracción del aceite crudo se realizó mediante hexano por el método de soxhlet. El rendimiento fue de un 47,86% en aceite crudo, 31,72% en aceite neutro y 94,89% en aceite decolorado. Por métodos analíticos se determinaron constantes químicas y físicas. Además por cromatografía gas-líquido se cuantificaron cinco esteres metílicos de ácidos grasos, usando DEGS como fase estacionaria. Los resultados del estudio indican que el aceite de Umarí corresponde a un aceite del tipo no secante y con alto contenido de ácidos grasos insaturados principalmente oleico. Los índices analíticos obtenidos confirman la conveniencia de usar aceite de Umarí para aplicaciones en alimentos y cosmética.

  18. Post combustion in converter steelmaking

    Energy Technology Data Exchange (ETDEWEB)

    Oghbasilasie, H.; Holappa, L.

    1997-12-31

    The purpose of this work is to study the fundamentals of post combustion and the effect of different process parameters on the post combustion ratio (PCR) and heat transfer efficiency (HTE) in converter steelmaking process. The PCR and HTE have been determined under normal operating conditions. Trials assessed the effect of lance height, vessel volume, foaming slag and pellet additions on PCR and HTE. Based on enthalpy considerations, post combustion of CO gas is regarded as one of the most effective means of increasing the heat supply to the BOP. The thermodynamic study of gas-metal-slag reactions gives the limiting conditions for post combustion inside the converter reactor. Different process parameters influencing both thermodynamic equilibria and kinetic conditions can greatly affect the post combustion ratio. Different features of converter processes as well smelting reduction processes utilizing post combustion have been reviewed. (orig.) SULA 2 Research Programme; 26 refs.

  19. Combustion of single biomass particles in air and in oxy-fuel conditions

    OpenAIRE

    Riaza Benito, Juan; Khatami, Reza; Levendis, Yiannis A.; Álvarez González, Lucía; Gil Matellanes, María Victoria

    2014-01-01

    The combustion behaviors of four different pulverized biomasses were evaluated in the laboratory. Single particles of sugarcane bagasse, pine sawdust, torrefied pine sawdust and olive residue were burned in a drop-tube furnace, set at 1400 K, in both air and O2/CO2 atmospheres containing 21, 30, 35, and 50% oxygen mole fractions. High-speed and high-resolution images of single particles were recorded cinematographically and temperature–time histories were obtained pyrometrically. Combustion o...

  20. Multidimensional Modeling of Fuel Composition Effects on Combustion and Cold-starting in Diesel Engines

    Science.gov (United States)

    1995-01-01

    equally important for both the gas and liquid phase. For the gas phase, a modified Redlich - Kwong equation of state is used (Prausnitz, [lo]). In the...residual fuel mass (case 9). Ignition started early but the combustion developed at a slower rate. Another application of an altered engine geometry...Power, Vol. 115, pp. 781-789,1993. 17. Kong, S.C., Han, Z., and Reitz, R.D., “The Development and Application of a Diesel Ignition and Combustion

  1. Efecto de diferentes métodos de extracción sobre el perfil de ácidos grasos en el aceite de aguacate (Persea americana Mill. var. Hass

    Directory of Open Access Journals (Sweden)

    Arturo Martínez Zavala

    2011-01-01

    Full Text Available El objetivo de este estudio fue evaluar la posible formación de ácidos grasos trans (AGT en el aceite de aguacate, extraído con disolvente (hexano, con y sin calor, y por centrifugación. Para analizar el aceite se emplearon índices químicos, y para la identificación y cuantificación de los ácidos grasos se utilizó Espectroscopía de Infrarrojo con Transformada de Fourier (EITF, en la región media de 400 a 4000 cm E-1 y cromatografía de gases. En los resultados del análisis por EITF se demostró que los tres aceites presentaron un pico definido en la región de 968 cm E-1 que corresponde a los dobles enlaces trans. Los AGT se cuantificaron < 0,5 g/100 g de aceite, valores menores que el propuesto por The Danish Veterinary and Food Administration para considerar un aceite libre de AGT. De acuerdo con los índices químicos, el método que causó la mínima modificación en la calidad del aceite fue el de extracción por centrifugación.

  2. Efecto de diferentes métodos de extracción sobre el perfil de ácidos grasos en el aceite de aguacate (Persea americana Mill. var. Hass

    Directory of Open Access Journals (Sweden)

    José Alberto Ariza Ortega

    2011-12-01

    Full Text Available El objetivo de este estudio fue evaluar la posible formación de ácidos grasos trans (AGT en el aceite de aguacate, extraído con disolvente (hexano, con y sin calor, y por centrifugación. Para analizar el aceite se emplearon índices químicos, y para la identificación y cuantificación de los ácidos grasos se utilizó Espectroscopía de Infrarrojo con Transformada de Fourier (EITF, en la región media de 400 a 4000 cm-1 y cromatografía de gases. En los resultados del análisis por EITF se demostró que los tres aceites presentaron un pico definido en la región de 968 cm-1 que corresponde a los dobles enlaces trans. Los AGT se cuantificaron < 0,5 g/100 g de aceite, valores menores que el propuesto por The Danish Veterinary and Food Administration para considerar un aceite libre de AGT. De acuerdo con los índices químicos, el método que causó la mínima modificación en la calidad del aceite fue el de extracción por centrifugación.

  3. Pulsating combustion - Combustion characteristics and reduction of emissions

    Energy Technology Data Exchange (ETDEWEB)

    Lindholm, Annika

    1999-11-01

    In the search for high efficiency combustion systems pulsating combustion has been identified as one of the technologies that potentially can meet the objectives of clean combustion and good fuel economy. Pulsating combustion offers low emissions of pollutants, high heat transfer and efficient combustion. Although it is an old technology, the interest in pulsating combustion has been renewed in recent years, due to its unique features. Various applications of pulsating combustion can be found, mainly as drying and heating devices, of which the latter also have had commercial success. It is, however, in the design process of a pulse combustor, difficult to predict the operating frequency, the heat release etc., due to the lack of a well founded theory of the phenomenon. Research concerning control over the combustion process is essential for developing high efficiency pulse combustors with low emissions. Natural gas fired Helmholtz type pulse combustors have been the experimental objects of this study. In order to investigate the interaction between the fluid dynamics and the chemistry in pulse combustors, laser based measuring techniques as well as other conventional measuring techniques have been used. The experimental results shows the possibilities to control the combustion characteristics of pulsating combustion. It is shown that the time scales in the large vortices created at the inlet to the combustion chamber are very important for the operation of the pulse combustor. By increasing/decreasing the time scale for the large scale mixing the timing of the heat release is changed and the operating characteristics of the pulse combustor changes. Three different means for NO{sub x} reduction in Helmholtz type pulse combustors have been investigated. These include exhaust gas recirculation, alteration of air/fuel ratio and changed inlet geometry in the combustion chamber. All used methods achieved less than 10 ppm NO{sub x} emitted (referred to stoichiometric

  4. Thermogravimetric investigation on the degradation properties and combustion performance of bio-oils.

    Science.gov (United States)

    Ren, Xueyong; Meng, Jiajia; Moore, Andrew M; Chang, Jianmin; Gou, Jinsheng; Park, Sunkyu

    2014-01-01

    The degradation properties and combustion performance of raw bio-oil, aged bio-oil, and bio-oil from torrefied wood were investigated through thermogravimetric analysis. A three-stage process was observed for the degradation of bio-oils, including devolatilization of the aqueous fraction and light compounds, transition of the heavy faction to solid, and combustion of carbonaceous residues. Pyrolysis kinetics parameters were calculated via the reaction order model and 3D-diffusion model, and combustion indexes were used to qualitatively evaluate the thermal profiles of tested bio-oils for comparison with commercial oils such as fuel oils. It was found that aged bio-oil was more thermally instable and produced more combustion-detrimental carbonaceous solid. Raw bio-oil and bio-oil from torrefied wood had comparable combustion performance to fuel oils. It was considered that bio-oil has a potential to be mixed with or totally replace the fuel oils in boilers.

  5. Active Combustion Control Valve Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Over the past decade, research into active combustion control has yielded impressive results in suppressing thermoacoustic instabilities and widening the...

  6. Mathematical Modeling in Combustion Science

    CERN Document Server

    Takeno, Tadao

    1988-01-01

    An important new area of current research in combustion science is reviewed in the contributions to this volume. The complicated phenomena of combustion, such as chemical reactions, heat and mass transfer, and gaseous flows, have so far been studied predominantly by experiment and by phenomenological approaches. But asymptotic analysis and other recent developments are rapidly changing this situation. The contributions in this volume are devoted to mathematical modeling in three areas: high Mach number combustion, complex chemistry and physics, and flame modeling in small scale turbulent flow combustion.

  7. Active Combustion Control Valve Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Over the past decade, research into active combustion control has yielded impressive results in suppressing thermoacoustic instabilities and widening the operational...

  8. The modes of gaseous combustion

    CERN Document Server

    Rubtsov, Nickolai M

    2016-01-01

    This book provides an analysis of contemporary problems in combustion science, namely flame propagation, detonation and heterophaseous combustion based on the works of the author. The current problems in the area of gas combustion, as well as the methods allowing to calculate and estimate limiting conditions of ignition, and flame propagation on the basis of experimental results are considered. The book focuses on the virtually inaccessible works of Russian authors and will be useful for experienced students and qualified scientists in the area of experimental studies of combustion processes.

  9. Aprovechamiento de las oleinas residuales procedentes del proceso de refinado de los aceites vegetales comestibles, para la fabricación de biodiesel

    Directory of Open Access Journals (Sweden)

    Álvarez Mateos, P.

    2003-06-01

    Full Text Available A procedure to obtain Biodiesel from “Oleinas” is studied. Biodiesel is a suitable product to replace diesel oil currently used to power the Diesel engines. It consists of a mixture of methyl esters of the fatty acids presents as triglycerides in vegetables oils (olive, sunflower, soya, rape oils. As a result of the refining of these oils for their use as food, a waste product is formed, the “oleinas” (acidulated soapstock. The oleinas consist of a mixture of triglycerides and free fatty acids, the latter amounting to 50% or more of the mixture and are subject to a fluctuating market, therefore it exist at times a problem for their disposal. In our research work we have tried to obtain biodiesel from oleinas. The process resulting from our experimental work is as follows: 1. Sterification of the free fatty acids with methanol, by acid catalysis, centrifuging the reaction product and removal of the acid-methanol phase. Drying of the latter. At this stage we have a product containing about 70% of methyl esters. 2. Transesterification of the triglycerides present in the sterified product with methanol by alkaline catalysis, washing the reaction product with a water methanol solution. Centrifuging and removal of the water-methanol phase. At this stage a biodiesel product is obtained containing about 90% of methyl esters. 3. Fractional vacuum distillation of the 90% biodiesel gives a final product with a methyl esters content higher than 98%.Se estudia un procedimiento para la obtención de Biodiesel a partir de las “Oleínas”. Biodiesel es un producto capaz de sustituir al combustible Diesel ordinario que se obtiene del petróleo y que consiste en una mezcla de ésteres metílicos de ácidos grasos. Las oleínas son unos residuos que resultan del proceso de refinado de aceites vegetales para su uso alimentario y se componen de una mezcla de triglicéridos y ácidos grasos libres, con un contenido de estos últimos

  10. Co-combustion of coal and sewage sludge: chemical and ecotoxicological properties of ashes.

    Science.gov (United States)

    Barbosa, Rui; Lapa, Nuno; Boavida, Dulce; Lopes, Helena; Gulyurtlu, Ibrahim; Mendes, Benilde

    2009-10-30

    The co-combustion of sewage sludge (SS) and coal is widely used for the treatment and thermal valorization of SS produced in wastewater treatment plants. The chemical and ecotoxicological properties of the ashes produced in this thermal treatment have not been fully studied. Two combustion tests were performed in a fluidized bed combustor. Colombian coal was used as fuel in test A. A blend (1+1) of this coal and a stabilized SS (Biogran) was used in a second test B. Samples of the bottom and fly ashes trapped in two sequential cyclones were collected. The characterization of the ashes was focused on two main aspects: (1) the bulk content of a set of metals and (2) the characterization of eluates produced according to the European Standard leaching test EN 12457-2. The eluates were submitted to an ecotoxicological characterization for two bio-indicators. In what concerns the bulk content of ashes, both combustion tests have produced ashes with different compositions. The ashes formed during the co-combustion test have shown higher concentrations of metals, namely Cr, Cu, Ni, Pb, Zn and Fe for all ashes. The leaching test has shown low mobility of these elements from the by-products produced during the combustion and co-combustion tests. Cr and Cr(VI) were mainly detected in the eluates of the 1st cyclone ashes produced in both combustion tests and in the 2nd cyclone ashes produced in the co-combustion test. Considering the ecotoxicity assays, the eluates of bottom and fly ashes for both combustion and co-combustion tests have shown low ecotoxic levels. The micro-crustacean Daphnia magna was generally more sensitive than the bacterium Vibrio fischeri. CEMWE criterion has allowed to classify the bottom ashes for both combustion and co-combustion tests as non-toxic residues and the fly ashes collected in both cyclones as toxic.

  11. Possibilities of the use of heating oil residues. Moeglichkeiten der Verwertung von Heizoelresten

    Energy Technology Data Exchange (ETDEWEB)

    Froebel, J. (DBI Gas- und Umwelttechnik GmbH, Leipzig (Germany)); Kaiser, G. (DBI Gas- und Umwelttechnik GmbH, Leipzig (Germany))

    1994-08-01

    An industrial-scale experiment is described in which residues of heating oil produced by brown coal liquefaction were added to raw brown coal and combusted in grate furnaces satisfactory results. The problem of heating oil residues has its origines in the energy policy of the former GDR; methods of disposal are therefore of interest especially in the new East German states. (orig.)

  12. Combustion Branch Website Development

    Science.gov (United States)

    Bishop, Eric

    2004-01-01

    The NASA combustion branch is a leader in developing and applying combustion science to focused aerospace propulsion systems concepts. It is widely recognized for unique facilities, analytical tools, and personnel. In order to better communicate the outstanding research being done in this Branch to the public and other research organization, a more substantial website was desired. The objective of this project was to build an up-to-date site that reflects current research in a usable and attractive manner. In order to accomplish this, information was requested from all researchers in the Combustion branch, on their professional skills and on the current projects. This information was used to fill in the Personnel and Research sections of the website. A digital camera was used to photograph all personnel and these photographs were included in the personnel section as well. The design of the site was implemented using the latest web standards: xhtml and external css stylesheets. This implementation conforms to the guidelines recommended by the w3c. It also helps to ensure that the web site is accessible by disabled users, and complies with Section 508 Federal legislation (which mandates that all Federal websites be accessible). Graphics for the new site were generated using the gimp (www.gimp.org) an open-source graphics program similar to Adobe Photoshop. Also, all graphics on the site were of a reasonable size (less than 20k, most less than 2k) so that the page would load quickly. Technologies such as Macromedia Flash and Javascript were avoided, as these only function on some clients which have the proper software installed or enabled. The website was tested on different platforms with many different browsers to ensure there were no compatibility issues. The website was tested on windows with MS IE 6, MSIE 5 , Netscape 7, Mozilla and Opera. On a Mac, the site was tested with MS IE 5 , Netscape 7 and Safari.

  13. Alternate fuels; Combustibles alternos

    Energy Technology Data Exchange (ETDEWEB)

    Romero Paredes R, Hernando; Ambriz G, Juan Jose [Universidad Autonoma Metropolitana. Iztapalapa (Mexico)

    2003-07-01

    In the definition and description of alternate fuels we must center ourselves in those technological alternatives that allow to obtain compounds that differ from the traditional ones, in their forms to be obtained. In this article it is tried to give an overview of alternate fuels to the conventional derivatives of petroleum and that allow to have a clear idea on the tendencies of modern investigation and the technological developments that can be implemented in the short term. It is not pretended to include all the tendencies and developments of the present world, but those that can hit in a relatively short term, in accordance with agreed with the average life of conventional fuels. Nevertheless, most of the conversion principles are applicable to the spectrum of carbonaceous or cellulosic materials which are in nature, are cultivated or wastes of organic origin. Thus one will approach them in a successive way, the physical, chemical and biological conversions that can take place in a production process of an alternate fuel or the same direct use of the fuel such as burning the sweepings derived from the forests. [Spanish] En la definicion y descripcion de combustibles alternos nos debemos centrar en aquellas alternativas tecnologicas que permitan obtener compuestos que difieren de los tradicionales, al menos en sus formas de ser obtenidos. En este articulo se pretende dar un panorama de los combustibles alternos a los convencionales derivados del petroleo y que permita tener una idea clara sobre las tendencias de la investigacion moderna y los desarrollos tecnologicos que puedan ser implementados en el corto plazo. No se pretende abarcar todas las tendencias y desarrollos del mundo actual, sino aquellas que pueden impactar en un plazo relativamente corto, acordes con la vida media de los combustibles convencionales. Sin embargo, la mayor parte de los principios de conversion son aplicables al espectro de materiales carbonaceos o celulosicos los cuales se

  14. Identificación y clasificación en biotipos de las malezas asociadas con el cultivo de la palma de aceite

    OpenAIRE

    2012-01-01

    En dos plantaciones de palma de aceite, ubicadas en los municipios de Villanueva, Casanare, y Barranca de Upía, Meta, (Colombia), zona del Bajo Upía, se realizó un reconocimiento y clasificación en biotipos de las malezas asociadas con la palma de aceite. Para realizar el trabajo se visitaron las dos fincas, y se procedió a recoger muestras y fotografiar las malezas que se encontraban dentro del cultivo, así como en su contorno. La identificación y descripción se realizó siguiendo la metodolo...

  15. AIR EMISSIONS FROM SCRAP TIRE COMBUSTION

    Science.gov (United States)

    The report discusses air emissions from two types of scrap tire combustion: uncontrolled and controlled. Uncontrolled sources are open tire fires, which produce many unhealthful products of incomplete combustion and release them directly into the atmosphere. Controlled combustion...

  16. Path planning during combustion mode switch

    Science.gov (United States)

    Jiang, Li; Ravi, Nikhil

    2015-12-29

    Systems and methods are provided for transitioning between a first combustion mode and a second combustion mode in an internal combustion engine. A current operating point of the engine is identified and a target operating point for the internal combustion engine in the second combustion mode is also determined. A predefined optimized transition operating point is selected from memory. While operating in the first combustion mode, one or more engine actuator settings are adjusted to cause the operating point of the internal combustion engine to approach the selected optimized transition operating point. When the engine is operating at the selected optimized transition operating point, the combustion mode is switched from the first combustion mode to the second combustion mode. While operating in the second combustion mode, one or more engine actuator settings are adjusted to cause the operating point of the internal combustion to approach the target operating point.

  17. Evaluation of the use of a vegetable oil in distribution transformers Evaluación del uso de un aceite vegetal en transformadores de distribución

    Directory of Open Access Journals (Sweden)

    Diego Fernando-Navas

    2012-08-01

    Full Text Available Since the start of transformers immersed in refrigerating liquid, the fluid traditionally used has been mineral oil. However, in recent decades, efforts have been joined in the search for alternatives with a lower environmental impact and which also satisfy the technical requirements of insulation and refrigeration in the transformers. Currently, insulating vegetable oils are available in the market, which may have lower environmental impact during their use and final disposition; nevertheless, their high cost and short time of use have limited their massive application. This work presents the thermal behavior evaluation of two distribution transformers at different powers immersed in dielectric vegetable oil, comparing their performance with that of two constructively equal transformers immersed in mineral oil. The results obtained reveal that the transformers comply with the requirements of existing standards.Desde los inicios de los transformadores inmersos en líquido refrigerante, el fluido empleado por tradición ha sido el aceite de origen mineral. Sin embargo, en las últimas décadas se han unido esfuerzos en la búsqueda de alternativas que tengan un menor impacto en el medio ambiente y que a su vez satisfagan los requerimientos técnicos de aislamiento y refrigeración en los transformadores. Actualmente se encuentran en el mercado aceites aislantes de origen vegetal que pueden tener un menor impacto ambiental durante su uso y disposición final; no obstante, su elevado costo y su poco tiempo de uso han limitado su aplicación masiva. En este trabajo se presenta la evaluación del comportamiento térmico de dos transformadores de distribución de diferente potencia inmersos en aceite dieléctrico de origen vegetal y se compara su desempeño con el de dos transformadores constructivamente iguales inmersos en aceite mineral. Los resultados obtenidos revelan que los transformadores cumplen con los requerimientos de la normatividad

  18. Estudio de la Desodorización de Aceite de Soja por Simulación Study of Soybean Oil Deodorization using Simulation

    Directory of Open Access Journals (Sweden)

    Marcelo N Yerien

    2010-01-01

    Full Text Available Se presentan resultados de la simulación de la operación de desodorización de aceites vegetales. Para efectos de simulación, el aceite de soja se modeló como una mezcla multicomponente de cinco compuestos: triglicérido, ácido graso, esterol, tocoferol y escualeno. Se estudiaron las condiciones de operación de flujo cruzado y flujo en contracorriente. Se varió la temperatura, presión y tiempo de contacto, se estudió cantidad de tocoferoles, esteroles y escualeno en el destilado y la presencia de compuestos trans en el aceite. Los resultados obtenidos estuvieron de acuerdo con resultados experimentales, e indicaron que el flujo en contracorriente es más conveniente desde el punto de vista de la calidad del destilado y del aceite, así como del consumo de vapor.This work presents simulation results of a vegetable oil deodorization process. For simulation purposes, the soybean oil was modelled as a five component mixture: triglyceride, fatty acid, sterol, tocopherol and squalene. Two types of flow, cross and countercurrent, were studied. The process temperature, pressure and contact time were changed, the amount of tocopherol, sterol and squalene in the distillate and the presence of trans compounds in the vegetable oil were analyzed. The results were in agreement with experiment and indicate that countercurrent flow is more convenient from the point of view of quality of the distillate and of the oil, as well as of steam consumption.

  19. CARACTERIZACIÓN DE LA FASE UPSTREAM DE LA CADENA DE VALOR Y ABASTECIMIENTO DE LA AGROINDUSTRIA DE LA PALMA DE ACEITE EN COLOMBIA

    Directory of Open Access Journals (Sweden)

    Rafael García Cáceres

    2013-01-01

    Full Text Available Este artículo proporciona una descripción de la fase upstream de la cadena agroindustrial de la palma de aceite. El trabajo caracteriza la funcionalidad y relaciones de eslabones y escalones de la cadena de abastecimiento y de valor de la cadena en Colombia. El trabajo representa un esfuerzo pionero que busca contribuir a mejorar la eficiencia y eficacia del sector palmero colombiano.

  20. Composición y método de elaboración de alimentos empanados con baja absorción de aceite durante la fritura

    OpenAIRE

    López Gómez, Antonio; Soto Jover, Sonia; Boluda Aguilar, María

    2014-01-01

    Número de publicación: 2440092. Número de solicitud: 201331812 La presente invención se refiere a una composición y método para la elaboración de croquetas y alimentos empanados, refrigerados o congelados que consigue reducir de forma notable la absorción de aceite durante la fritura previa a su consumo. Universidad Politécnica de Cartagena

  1. Caracterización de la fase upstream de la cadena de valor y abastecimiento de la agroindustria de la palma de aceite en colombia

    OpenAIRE

    Rafael García Cáceres; Adriana Núñez Moreno; Tatiana Ramírez Ortiz; Sonia Jaimes Suárez

    2013-01-01

    Este artículo proporciona una descripción de la fase upstream de la cadena agroindustrial de la palma de aceite. El trabajo caracteriza la funcionalidad y relaciones de eslabones y escalones de la cadena de abastecimiento y de valor de la cadena en Colombia. El trabajo representa un esfuerzo pionero que busca contribuir a mejorar la eficiencia y eficacia del sector palmero colombiano.

  2. Caracterización del aceite de semilla de borraja extraído con dióxido de carbono supercrítico

    Directory of Open Access Journals (Sweden)

    Delgado Andújar, A.

    1999-08-01

    Full Text Available The present work is based on a comparative study of the borage seed's oil obtained with supercritical carbon dioxide by means of the conventional extraction using hexane as a solvent. In the optimal working conditions, the results obtained in the extraction with carbon dioxide are comparable to those obtained in the extraction with hexane, although the oil's quality is higher. Therefore, the process of supercritical extraction with carbon dioxide could be more effective than conventional extraction because the solvent removal is not necessary and several steps of the oil refining process can be reduced notably.

    En el presente trabajo se realiza un estudio comparativo de la calidad del aceite de semilla de borraja obtenido con dióxido de carbono supercrítico y mediante extracción convencional empleando hexano como disolvente. La calidad del aceite extraído con dióxido de carbono es superior. En las condiciones óptimas de operación, los rendimientos encontrados en la extracción con dióxido de carbono, son comparables a los obtenidos en la extracción con hexano, si bien la calidad del aceite es superior. Por tanto, el proceso de Extracción Supercrítica con dióxido de carbono, al eliminar la etapa de recuperación del disolvente y simplificar sensiblemente el proceso de refinado del aceite, se presenta como una alternativa competitiva con la extracción convencional.

  3. Efecto de la adición del absorbedor UV (Tinuvin 234 sobre la calidad del aceite de soja en envases de polietileno tereftalato (PET

    Directory of Open Access Journals (Sweden)

    Mara Block, Jane

    2005-12-01

    Full Text Available In this work, the effect of the addition of the UV absorber Tinuvin 234 on the quality of soybean oil packaged in PET bottles stored at ambient temperature for 6 months under fluorescent light (634 lux. Along this period determinations were made of: peroxide value (PV, free fatty acids (FFA, specific extinction at 232 and 270 nm (EE and sensorial evaluation (SE. The analysis of variance and resistance between the linear coefficients of each treatment indicates that significant difference does not exist (pEn este trabajo, se investigó el efecto de la adición del absorbedor de UV Tinuvin 234 sobre la calidad de aceite de soja envasado en PET y almacenado bajo luz fluorescente (634 lux y temperatura ambiente (25 °C durante 6 meses. La evaluación del aceite se realizó mediante las determinaciones del: Índice de peróxido (IP, Ácidos grasos libres (AGL, Coeficiente de extinción específica a 232 y 270 nm (EE y evaluación sensorial (AS. El análisis de varianza y de contraste entre los coeficientes lineales de cada tratamiento indica que no existe diferencia significativa (p<0,0001 durante el almacenamiento en relación a todos las determinaciones (IP, AGL, EE y AS. Los resultados indican que la adición del Tinuvin 234 en las botellas PET en las concentraciones de 0,12 % y 0,22 % no fue eficiente en retardar el deterioro del aceite expuesto a la luz fluorescente, cuando se compara con aceite de soja envasado en PET sin adición de Tinuvin 234.

  4. Aplicación de emulsiones multicapa para la encapsulación de aceites con alto contenido de ácidos grasos poliinsaturados

    OpenAIRE

    Fioramonti, Silvana Alejandra

    2016-01-01

    Fil: Fioramonti, Silvana Alejandra. Universidad Nacional del Litoral. Facultad de Ingeniería Química; Argentina. Los ácidos grasos poliinsaturados son nutrientes esenciales que deben incorporarse con la dieta y reducen el riesgo cardiovascular. Sin embargo, son sensibles a la oxidación y deben diseñarse sistemas de recubrimiento para protegerlos e incorporarlos a alimentos. El objetivo del presente trabajo fue estudiar el proceso microencapsulación de aceite lino por emulsiones...

  5. El ensayo del ácido 2-tiobarbitúrico (atb) para medir la degradación autooxidativa de aceites vegetales comestibles

    OpenAIRE

    Vicario Romero, Isabel María

    1993-01-01

    En esta memoria se lleva a cabo un estudio general sobre el ensayo del acido 2-tiobarbiturico (atb) y su aplicacion a la determinacion de la degradacion autooxidativa de aceites vegetales comestibles. la recopilacion de todo el material cientifico disponible sobre este ensayo hasta el presente nos permite conocer las caracteristicas de la reaccion y su importancia en la valoracion de la degradacion autooxidativa de alimentos y otros sistemas biologicos, asi como las tecnicas empleadas y las a...

  6. Caracterización del aceite de semilla de uva extraído con dióxido de carbono supercrítico

    Directory of Open Access Journals (Sweden)

    Molero Gómez, A.

    1995-02-01

    Full Text Available In this work the quality of grape seed oil obtained by extraction with supercritical carbon dioxide was studied. At the optimun operating conditions (313 K and 25 MPa, the yield of supercritical extraction is similar to the conventional extraction by liquid solvent, but the quality of the grape seed oil extracted by supercritical carbon dioxide is higher.
    Furthermore, supercritical extraction could be more economical than liquid extraction because the solvent removal by distillation is not necessary and several steps of the subsequent oil refining process can be eliminated.

    En este trabajo se realiza un estudio de la calidad del aceite de semillas de uva obtenido por extracción con dióxido de carbono supercrítico. En las condiciones operativas óptimas del proceso (313 K y 25 MPa el rendimiento de la extracción supercrítica es similar al de la extracción con disolventes líquidos, pero la calidad del aceite es muy superior.
    En consecuencia, el proceso supercrítico resulta competitivo con el convencional al reducir las etapas de refinado del aceite y eliminar la destilación del disolvente, las más costosas desde el punto de vista energético.

  7. Costos de producción en el proceso de extracción de aceite de palma: Estudio de un caso

    Directory of Open Access Journals (Sweden)

    Rosana Meleán Romero

    2014-01-01

    Full Text Available El objetivo de esta investigación es analizar los costos de producción del proceso de extracción de aceite de palma, basados en el estudio de una de las empresas que conforman el sector palmicultor, ubicada en el estado Zulia-Venezuela. Se cataloga como analítica-proyectiva, de campo y transeccional; apoyada en material bibliográfico y otros documentos de interés necesarios para construir un instrumento de recolección de información (cuestionario, aplicado a informantes clave de una empresa del sector; se analiza la información recopilada, obteniendo como resultados que los costos se manejan de manera tradicional y dadas las complejidades del proceso que desarrolla la empresa, impide la determinación exacta del costo de los productos que elaboran: aceite rojo, aceite de palmiste y harina de palmiste. En función de ello, se propone una metodología híbrida de costeo que combina características del sistema de acumulación de costos por procesos y del costeo basado en actividades. Se concluye que una vez aplicada la propuesta realizada, la empresa podrá sistematizar sus costos de producción, obtener el costo unitario de los productos elaborados, además de encaminar el diseño de un sistema de información de costos ajustado a sus necesidades

  8. Procesado acuoso de soja con tecnología enzimática: extracción de aceite y producción de aislados

    Directory of Open Access Journals (Sweden)

    Domínguez, H.

    1995-02-01

    Full Text Available An enzymatic treatment was incorporated before the alkaline extraction during the aqueous processing of soya beans for oil and protein. The degradation on the plant cell wall structure by the enzymatic action, enhances the oil extractability by 10% of the potential extractable oil. No significant effect on the protein extractability was detected, although this effect was probably masked by the alkaline extraction. After the aqueous extraction, 30% of active enzyme was eliminated in the whey. This can be recovered and reutilized in the next stage.

    Se ha incorporado una etapa de tratamiento enzimático previa a la extracción acuosa en condiciones alcalinas durante el procesado para obtención de aceite y proteína de soja. La degradación de la estructura de la pared vegetal, causada por el ataque enzimático, aumenta la extractabilidad del aceite en un 10% respecto al aceite total extraíble. No se apreció efecto sobre el rendimiento de proteína debido posiblemente a que la posterior extracción a pH 9 inhibe los efectos de la acción enzimática. Tras la realización del proceso de extracción acuoso, se elimina en el suero un 30% de enzima activa, que puede ser reutilizada en el proceso.

  9. Manifold methods for methane combustion

    Energy Technology Data Exchange (ETDEWEB)

    Yang, B.; Pope, S.B. [Cornell Univ., Ithaca, NY (United States)

    1995-10-01

    Great progresses have been made in combustion research, especially, the computation of laminar flames and the probability density function (PDF) method in turbulent combustion. For one-dimensional laminar flames, by considering the transport mechanism, the detailed chemical kinetic mechanism and the interactions between these two basic processes, today it is a routine matter to calculate flame velocities, extinction, ignition, temperature, and species distributions from the governing equations. Results are in good agreement with those obtained for experiments. However, for turbulent combustion, because of the complexities of turbulent flow, chemical reactions, and the interaction between them, in the foreseeable future, it is impossible to calculate the combustion flow field by directly integrating the basic governing equations. So averaging and modeling are necessary in turbulent combustion studies. Averaging, on one hand, simplifies turbulent combustion calculations, on the other hand, it introduces the infamous closure problems, especially the closure problem with chemical reaction terms. Since in PDF calculations of turbulent combustion, the averages of the chemical reaction terms can be calculated, PDF methods overcome the closure problem with the reaction terms. It has been shown that the PDF method is a most promising method to calculate turbulent combustion. PDF methods have been successfully employed to calculate laboratory turbulent flames: they can predict phenomena such as super equilibrium radical levels, and local extinction. Because of these advantages, PDF methods are becoming used increasingly in industry combustor codes.

  10. Evaluación fisico-química de la semilla y del aceite de corozo ( Acrocomia aculeata Jacq.

    Directory of Open Access Journals (Sweden)

    Medina, Carlos

    2005-12-01

    Full Text Available In this research, physicochemical characteristics of the seed and seed oil of corozo ( Acrocomia aculeata Jacq., a wild palm from Central and South America , were evaluated. Seeds obtained from mature fruits from “El Chaparro” town, Anzoategui state, Venezuela, harvested in March 2003, were decorticated; the endospermus was transformed to meal by means of grinding and then using a sieve (425 µm, and its oil was extracted with n-hexane. The whole seed showed an average weight of 9.67 ± 0.32 (PEl objetivo de esta investigación fue evaluar algunas características físicas y químicas de la semilla y del aceite crudo extraído de la semilla del fruto de corozo ( Acrocomia aculeata Jacq., una palmera silvestre distribuida en Centroamérica y Sudamérica. A un lote se semillas obtenidas de frutos maduros procedentes de la población de “El Chaparro”, estado Anzoátegui, Venezuela, cosechados en Marzo 2003, se le separó el pericarpio y el endospermo. El endospermo fue transformado en harina, mediante molienda y tamizado (apertura 425 μm, y a ésta se le extrajo el aceite con n-hexano. A la semilla entera se le determinó la masa promedio (9,67 ± 0,32; P<0,05 y la proporción de pericarpio (75,39 % y endospermo (24,61 %. A la harina del endospermo de le determinó la composición proximal, presentando niveles importantes de grasa (53,13 %, proteína (13,75 % y fibra cruda (25,82 %. El aceite crudo de corozo presentó baja acidez libre (0,40 %, expresada como ácido oleico y alta resistencia a la oxidación (no se detectó peróxidos y el índice de estabilidad OSI fue de 100 h; sus índices de yodo y saponificación fueron 29,87 cg I/g y 205 mg KOH/g, respectivamente. La composición en ácidos grasos, determinada mediante cromatografía de gas, mostró mayor proporción de ácidos saturados (79,6 %, siendo el ácido láurico el de mayor concentración. La semilla de corozo es un recurso oleaginoso que puede ser útil

  11. Deterioro de aceite de soja parcialmente hidrogenado empleado en la fritura de un alimento cárnico

    Directory of Open Access Journals (Sweden)

    Sammán, Norma

    2005-03-01

    Full Text Available The deterioration of partially hydrogenated soybean oil used in deep fat frying of a meat food called milanesa for evaluating its behavior according to the Argentinian Food Codex (CAA at laboratory scale was studied. Two differebnt lots of the oil, in batch process, with fresh oil turnover were heated at 180ºC ± 2 ºC for 42 and 56 h, respectively. Deterioration was followed through the evolution of free fatty acid percentage, polar compounds, distribution of these deterioration species and fatty acid composition. In the first lot, at 42 h of heating, polar compounds increased from 4.6 % at t' 0 to 16 % (120 milanesas fried. In the second lot, at 56 h of heating, polar compounds increased from 2.5 to 27.6 % (160 milanesas fried. The main deterioration was thermal, considering the presence of triglycerides polymers and dimers in polar compounds, followed by hydrolytic deterioration. The free fatty acid percentage was higher than the maximum level of 1.25 % established in the CAA at an early stage of the frying process. According to the results of this study, it is recommended to include polar compound percentage as a measure of frying control processing and to check the free fatty acid value, which is considered too low.Se estudió a escala de laboratorio, el deterioro de aceite de soja parcialmente hidrogenado, en la fritura en profundidad de un alimento cárnico milanesas, para evaluar su comportamiento en relación a las disposiciones del Código Alimentario Argentino (CAA. Se trabajó con dos partidas de aceite, en proceso discontinuo, con reposición de aceite fresco, calentándose a 180 ± 2 ºC ., durante 42 y 56 h, respectivamente. El deterioro se siguió a través de la evolución de la acidez libre, compuestos polares, distribución de las especies de deterioro y composición en ácidos grasos. Primera partida, a las 42 h de calentamiento, los compuestos polares aumentaron desde 4.6 % a t'0 hasta 16 % (120 milanesas fritas

  12. Combustion & Laser Diagnostics Research Complex (CLDRC)

    Data.gov (United States)

    Federal Laboratory Consortium — Description: The Combustion and Laser Diagnostics Research Complex (CLRDC) supports the experimental and computational study of fundamental combustion phenomena to...

  13. Efecto del Aceite de Girasol Ozonizado sobre la Actividad de la Mieloperoxidasa en el Modelo de Edema en la Oreja del Ratón (Effect of Ozonized Sunflower Oil on Myeloperosidase Activity in the Model of Ear Oedema in Mouse)

    OpenAIRE

    Zamora Rodríguez Zamora:; González Carvajal Yousy:; Ledon Nuris

    2006-01-01

    El OLEOZON es un producto ozonizado que ha mostrado tener un gran efecto germicida. Tomando en consideración estos hallazgos, nosotros decidimos evaluar el efecto del OLEOZON sobre la actividad de lamieloperoxidasa en un modelo de edema en la oreja del ratón inducido por aceite de croto. Los animales fueron dividido en cinco grupos: el primero recibió, aceite de croto; el segundo grupo, recibió acetona como vehiculo del aceite de croto; el tercero, aceite de croto con indometacina como fármac...

  14. Combustion Tests of Rocket Motor Washout Material: Focus on Air toxics Formation Potential and Asbestos Remediation

    Energy Technology Data Exchange (ETDEWEB)

    G. C. Sclippa; L. L. Baxter; S. G. Buckley

    1999-02-01

    The objective of this investigation is to determine the suitability of cofiring as a recycle / reuse option to landfill disposal for solid rocket motor washout residue. Solid rocket motor washout residue (roughly 55% aluminum powder, 40% polybutadiene rubber binder, 5% residual ammonium perchlorate, and 0.2-1% asbestos) has been fired in Sandia's MultiFuel Combustor (MFC). The MFC is a down-fired combustor with electrically heated walls, capable of simulating a wide range of fuel residence times and stoichiometries. This study reports on the fate of AP-based chlorine and asbestos from the residue following combustion.

  15. Oxidación en sistemas lipídicos heterofásicos: emulsiones aceite en agua

    Directory of Open Access Journals (Sweden)

    Márquez-Ruiz, G.

    2002-06-01

    Full Text Available Lipid oxidation is the major form of deterioration in foods because it decreases food quality and nutritional value, and may have negative health implications. However, variables affecting lipid oxidation in heterophasic lipid systems are scarcely known, and they are of particular interest in the case on oil-in-water emulsions since these lipid systems constitute a large number of foods, e.g., milks, creams, mayonnaise’s, soups and sauces. In this paper, the present state of the art on lipid oxidation in oil-in-water emulsions is revised, including description of the variables specifically involved in oxidation of these lipid systems (pH, presence of interface, partition of reactants and products, interaction with other components as well as those affecting lipid oxidation in general but showing particular characteristics in their action in emulsions (oxygen, unsaturation degree, presence of antioxidants and prooxidants.La oxidación lipídica es la alteración más importante que ocurre en los alimentos porque disminuye su calidad y valor nutritivo, y puede tener consecuencias negativas para la salud. Sin embargo, las variables que afectan a la oxidación en sistemas lipídicos heterofásicos son poco conocidas y, en particular, poseen gran interés en el caso de las emulsiones aceite en agua ya que estos sistemas lipídicos constituyen un elevado número de alimentos, por ejemplo, leches, natas, mayonesas, sopas y salsas. En este trabajo, se revisa la situación actual del conocimiento sobre oxidación en emulsiones aceite en agua, incluyendo la descripción de las variables implicadas específicamente en la oxidación de estos sistemas (pH, presencia de la interfase, partición de reactivos y productos, interacciones con otros componentes así como de las variables que afectan a la oxidación de los lípidos en general pero cuya acción en emulsiones presenta características particulares (oxígeno, grado de insaturación, presencia de

  16. Características fisicoquímicas del aceite del mesocarpio de la coroba (Jessenia polycarpa Karst

    Directory of Open Access Journals (Sweden)

    Moreno Alvarez, Mario J.

    2002-12-01

    Full Text Available Mature fruits of coroba (Jessenia polycarpa Karst, a wild palm from Cedeño municipality (Bolívar estate, Venezuela, harvested on July 1999, were washed, scalded, decorticated and then the mesocarp was separated. It was dried (70 ºC by 12 h, grounded and extraction process with n-hexane was applicated. The extract was distilled for to obtain the crude oil free of solvent. Physicochemical characteristics of crude oil from Coroba mesocarp were determined by means of Venezuelan official methods (COVENIN. The results showed: free acidity 0.72 % (as oleic acid; iodine index 48.2 (cgI2/g; peroxid value 2.32 (meq O2/kg; refraction index 1.4465 (at 25ºC; saponification number 198 (mg KOH/g; phosporus content 183 (mg/kg. The fatty acids composition was determined by gas chromatography. The major fatty acids found were: oleic acid (46.06 %, palmitic acid (28.56% and linoleic acid (18.04%. The Coroba mesocarp is a potential raw material for Venezuelan oil industry.Frutos maduros de Coroba (Jessenia polycarpa Karst, una palmera silvestre del municipio Cedeño (Estado Bolívar, Venezuela, cosechados en el mes de Julio de 1999, fueron lavados, escaldados, pelados y despulpados. El mesocarpio obtenido fue secado (70ºC durante 12 h, molido y sometido a extracción con n-hexano. La miscela fue destilada, quedando como producto de fondo el aceite crudo. Mediante metodologías Venezolanas COVENIN se determinaron las características fisicoquímicas del aceite de mesocarpio de la Coroba, obteniéndose los siguientes resultados: acidez libre 0,72% (como ácido oleico; índice de yodo 48,23 (cgI2/g; índice de peróxidos 2,30 (meq O2/kg; índice de refracción 1,4465 (a 25 ºC; índice de saponificación 198 (mg KOH/g; contenido de fósforo 183 (mg/kg. La composición de ácidos grasos fue determinada por cromatografía de gas. Los ácidos grasos mayoritarios fueron: ácido oleico (46,06%, ácido palmítico (28,56% y ácido linoleico (18,04%. El

  17. Release of Inorganic Elements during Wood Combustion. Release to the Gas Phase of Inorganic Elements during: Wood Combustion. Part 1: Development and Evaluation of Quantification Methods

    DEFF Research Database (Denmark)

    van Lith, Simone Cornelia; Alonso-Ramírez, Violeta; Jensen, Peter Arendt

    2006-01-01

    elements was quantified by a mass balance based on the weights and inorganic compositions of the fuel and the ash residues obtained by high-temperature (500-1150 C) treatment in a laboratory-scale tube reactor. However, method A involved the pyrolysis and combustion of a small fuel sample (~30 g......During wood combustion, inorganic elements such as alkali metals, sulfur, chlorine, and some heavy metals are partly released to the gas phase, which may cause problems in combustion facilities because of deposit formation and corrosion. Furthermore, it may cause harmful emissions of gases...... and particulate matter. The aim of this study is to obtain quantitative data on the release of inorganic elements during wood combustion, which will serve as input data for models aiming to address ash-related problems. Three quantification methods were developed. In all three methods, the release of inorganic...

  18. Mechanism of combustion synthesis of silicon carbide

    Science.gov (United States)

    Narayan, J.; Raghunathan, R.; Chowdhury, R.; Jagannadham, K.

    1994-06-01

    The mechanism of self-propagating high-temperature synthesis (SHS) or combustion synthesis of SiC has been investigated using pellets consisting of silicon and carbon powders. The combustion reaction was initiated by rapidly heating the pellet on a graphite strip. The reaction products were analyzed using scanning and transmission electron microscopy, x-ray diffraction, and Raman spectroscopy. The results show that it is possible to produce β-SiC without any residual silicon and carbon. Occasionally, a very small number density of α-SiC precipitates embedded in the β-SiC matrix was observed. Based upon the microstructural features, it is proposed that the formation of SiC involves the dissolution of carbon into liquid silicon, diffusion of C into liquid silicon, and subsequent precipitation of SiC. The size of the SiC crystallites is determined by the diffusion coefficient of carbon in liquid silicon and the time available for SiC precipitation. The activation enthalpy for the SHS process is estimated to be 59±3 kcal/mol.

  19. Determinación de compuestos polares por TLC-FID en aceites refinado y semi-hidrogenado de soja sometidos a calentamiento prolongado

    Directory of Open Access Journals (Sweden)

    Cruzian, J. L.

    1997-06-01

    Full Text Available The thermal degradation of oils and fats leads to the formation of polar compounds, which is the reason why their determination is adopted for the quality control of the oil and fat used in frying. Samples of refined and partially hydrogenated soybean oil were heated for 30 and 60 hours respectively and the polar compounds content were determined using the lUPAC-AOAC official method and TLC-FID. The samples of oil and the fractions separated on the column were applied to the chromarods and developed in petroleum ether: diethyl ether (93:7 v/v. The determination of polar compounds by lUPAC method and by TLC-FID presented similar results (P-value<< 0,001, although when the content was greater than 16% the second method gave higher values. The results showed that the state of degradation of oils and fats as measured for the quantity of polar compounds can be determined alternatively by TLC-FID, presenting a significant reduction in time, hand work and solvent volume.

    La degradación térmica de aceites y grasas lleva a la formación de compuestos polares, motivo por el cual su determinación es usada como control de calidad de aceites y grasas utilizadas en fritura. Muestras de aceite de soja refinado y semi-hidrogenado fueron calentadas durante 30 y 60 horas respectivamente y el contenido de compuestos polares fue determinado utilizando el método oficial lUPAC-AOAC y TLCFID. Las muestras de aceite y las fracciones separadas en la columna fueron aplicadas en los «chromarods» y desarrolladas en éter de petróleo: éter etílico (93:7 v/v. La determinación de compuestos polares por el método lUPAC y por TLC-FID, dieron resultados similares (P-value<< 0,001, aunque los obtenidos por el segundo método fueron superiores, cuando los compuestos polares superan el 16%. Los resultados obtenidos indican que el estado de descomposición de aceites y grasas medido por la cantidad de compuestos polares puede ser determinado alternativamente por

  20. Efecto del CO2 en la atmósfera de almacenamiento del fruto sobre la calidad del aceite de oliva

    Directory of Open Access Journals (Sweden)

    García, J. María

    1993-06-01

    Full Text Available Olive fruits (Olea europaea, cv. "Picual" were stored at 5°C and four different atmospheres (% CO2/% O2/%N2: 0/21/78; 5/20/75; 10/19/71 and 20/17/63. At 5°C the enrichment of the fruit storage atmosphere with concentrations of CO2 above 5% resulted in a linear increase of the acidity of extracted oils after 60 days of fruit storage time. This fact showed a strong relationship with the appearance of fruit decay. Simple refrigeration of fruits at 5°C for 60 days was sufficient to maintain the commercial quality of "virgin extra" in oil extracted from them. Oils obtained from fruits stored at 5°C in CO2 enriched atmospheres showed lower peroxide index and UV absorbance (270 nm, but developed off-flavor. Therefore, > 5% CO2 concentrations in storage atmosphere of olive fruits for oil production at 5°C must be avoided.Se han conservado aceitunas (Olea europaea, cv. "Picual", destinadas a la producción de aceite, con refrigeración a 5°C y cuatro diferentes atmósferas (% CO2/%O2/%N2: 0/21/78; 5/20/75; 10/19/71 y 20/17/63. A 5°C, el aumento del grado de acidez experimentado por los aceites extraídos después de 60 días de almacenamiento del fruto fue proporcional al enriquecimiento de la atmósfera de conservación del citado fruto con una concentración igual o superior al 5% de CO2. Este hecho tuvo una relación estrecha con la incidencia de podredumbre. La simple refrigeración a 5°C de la aceituna fue suficiente para retener durante 60 días en el aceite extraído la categoría comercial de "virgen extra". Los aceites obtenidos de frutos almacenados a 5°C en atmósferas enriquecidas con CO2 presentaron menores índices de peróxidos y absorbancia ultravioleta (270 nm, pero presentaron, así mismo, olores y sabores extraños. En consecuencia, a 5°C deben ser evitadas las concentraciones de CO2 iguales o superiores al 5% en la atmósfera de conservación de las aceitunas destinadas a la producción de aceite.

  1. Migración de hierro y níquel, y estabilidad oxidativa del aceite refinado de soja calentado en utensilios culinarios de diversos materiales

    Directory of Open Access Journals (Sweden)

    Almeyda Haj-Isa, Niurka Maritza

    2007-12-01

    Full Text Available Cookware may release some inorganic components into foods during cooking, some of which have undesirable consequences. In fried foods, for instance, oil oxidation is favored by metals. The present study evaluated oxidative stability (AOCS method and iron and nickel migration (inductively coupled plasma-optical emission spectrometry into refined soybean oil in four cycles, with intervals of 24 hours. The cookware materials were glass, aluminum, stainless steel, iron and soapstone. The results demonstrated that the lowest metal migration occurred from glass and aluminum pans while the oil heated in these pans showed the highest oxidative stability. The highest migration of Fe and Ni into the oil occurred from the soapstone and iron pots (3.94 and 3.21 mg _ kg-1, respectively.Nevertheless, increasing loss of oxidative stability was evident in the oils heated in the soapstone, stainless steel and iron cookware, in this order. Since iron migration was lower from glass and aluminum pans, these were considered the best type of materials for fryingDurante la elaboración de alimentos los utensilios culinarios pueden liberar componentes inorgánicos ocasionalmente no deseables. La oxidación del aceite es durante la fritura es favorecida por la presencia de metales. Fue evaluada la migración de hierro y níquel (espectrometría de emisión óptica y la estabilidad oxidativa (método AOCS del aceite de soja sometido a cuatro calentamientos con intervalos de 24 horas en cazuelas de vidrio, aluminio, acero inoxidable, hierro y piedra-jabón. La mayor migración de hierro al aceite ocurrió en las cazuelas de hierro (3,94 mg•kg–1 y piedra (3,21 mg _ kg–1, sin diferencia estadística entre ellas. La pérdida progresiva de estabilidad oxidativa fue acentuada en los aceites calentados en utensilios de piedra, acero inoxidable e hierro, en tal orden. Vidrio y aluminio fueron considerados los mejores materiales para la fabricación de cazuelas

  2. Influencia del proceso de maduración del fruto en la calidad sensorial de aceites de oliva virgen de las variedades Picual, Hojiblanca y Picudo

    Directory of Open Access Journals (Sweden)

    Jiménez Herrera, B.

    2012-10-01

    Full Text Available The sensory quality of virgin olive oil is closely correlated with the cultivar and the degree of ripening of the olive fruit. The aim of the present work was to investigate the influence of ripening degree on sensory profile of monovarietal virgin olive oils (VOO in order to establish an optimum harvesting time. Fruit obtained from three different cultivars, Picual, Picudo and Hojiblanca were picked at nine different stages of ripeness. The quality parameters were evaluated and the sensory characteristics were determinate by a sensor panel. The analytical parameters decrease slightly in all cultivars. The evolution of the organoleptic characteristics of the virgin olive oil is reported and typical flavors are described for each cultivar. In all studied cultivar, “fruity” and “bitter” attributes decreased during the ripening and conversely “sweet” attribute increased. The results showed in this work could be considered useful for providing information about the evolution of sensory quality of virgin olive oils during ripening to obtain those based on market preferences.

    La calidad sensorial del aceite de oliva virgen (AOV está estrechamente relacionada con la variedad y el grado de maduración de la aceituna. El objetivo del presente trabajo fue investigar la influencia del grado de maduración sobre el perfil sensorial de aceites de oliva virgen monovarietales con el fin de establecer el momento óptimo de recolección. Los frutos de tres variedades diferentes, Picual, Picudo y Hojiblanca fueron recolectados en nueve etapas de maduración diferentes. Los parámetros de calidad fueron evaluados y las características organolépticas se determinaron por un panel de cata. Los resultados muestran que los parámetros analíticos disminuyeron ligeramente en todas las variedades. Para cada variedad se describe la evolución de las características organolépticas de los aceites de oliva virgen así como sus flavores típicos. En

  3. Composición, caracterización y potencial aterogénico de aceites, grasas y otros derivados producidos o comercializados en Costa Rica

    Directory of Open Access Journals (Sweden)

    Monserrat Castro-Bolaños

    2005-01-01

    Full Text Available Las enfermedades cardiovasculares, tan comunes entre los costarricenses, están relacionadas con la ingesta de altas cantidades de lípidos capaces de ejercer una acción perjudicial en las arterias del cuerpo humano. El presente estudio tuvo como objetivo determinar la calidad de las grasas y aceites más consumidos por la población de nuestro país. Se recolectaron y codificaron 15 marcas diferentes de mantequillas o margarinas (A, B, D1 a D11, 7 tipos de mantecas (E1 a E7 y 14 marcas diferentes de aceites de girasol (EG1 a EG3, maíz (EM1 a EM3, oliva (EO1 a EO4, soya (ES1 a ES3 y de palma africana (EV (Cuadro 1. Un 67% de los productos son elaborados por empresas nacionales y un 33% corresponden a productos importados y comercializados en nuestro país. Se determinó, mediante cromatografía de gases, la composición de los ácidos grasos, empleando resonancia magnética nuclear se calculó el número de dobles enlaces, hidrógenos alílicos y doblemente arílicos, también se analizaron los índices de yodo y saponificación, y la masa molar promedio en la fracción lipídica de muestras quintuplicadas de todos los productos. Utilizando estos parámetros, se encontró que 2 tipos de mantequillas y un tipo de aceite están probablemente adulterados con triacilgliceroles de origen diferente, ya que su composición no coincidió con la descripción en la etiqueta del producto. Considerando solamente el número de dobles enlaces, hidrógenos alílicos y doblemente arílicos presentes en los aceites, grasas y productos derivados, se determinó que los aceites de girasol, maíz y oliva son los más susceptibles a las reacciones de oxidación lipídica. A través de la determinación de la relación ácidos grasos poliinsaturados / ácidos grasos saturados y del índice de aterogenicidad se evaluó el potencial aterogénico de los distintos productos, se obtuvo como resultado que los más perjudiciales son 2 tipos de mantequillas y 5 tipos de

  4. Desempeño del método cromatográfico para el estudio de estabilidad del aceite de hígado de tiburón microencapsulado empleando acetato de quitosana

    Directory of Open Access Journals (Sweden)

    Caridad García

    Full Text Available Objetivo: Evaluar el desempeño del método para la cuantificación de la vitamina A en el aceite microencapsulado, empleando acetato de quitosana y maltodextrina como agentes encapsulantes, así como estudiar la estabilidad del aceite microencapsulado. Materiales y métodos: Los parámetros evaluados se correspondieron con lo establecido internacionalmente para este estudio: especificidad, exactitud y precisión. El estudio de estabilidad se realizó durante 12 meses a temperatura ambiente (30 ± 2ºC y 70 ± 5 % de humedad relativa, evaluándose en el tiempo la eficiencia de encapsulación, aceite superficial, pérdidas por desecación, contenido de vitamina A y conteo microbiológico. Resultados: Se demostró que el método evaluado fue específico, preciso y exacto para la determinación del contenido de vitamina A en la mezcla de aceite microencapsulado. Los resultados demuestran que el aceite microencapsulado tiene un comportamiento estable en cuanto a los indicadores evaluados, evidenciándose la protección ofrecida por los componentes de la pared de las microcápsulas. Conclusiones: El método empleado en la cuantificación de la vitamina A en el aceite microencapsulado resultó específico, exacto y preciso, demostrándose su aplicabilidad para el control de calidad y estudio de estabilidad. El aceite microencapsulado con acetato de quitosana y maltodextrina como agentes encapsulantes, es estable física, química y microbiológicamente, durante 12 meses.

  5. The first turbulent combustion

    CERN Document Server

    Gibson, C H

    2005-01-01

    The first turbulent combustion arises in a hot big bang cosmological model Gibson (2004) where nonlinear exothermic turbulence permitted by quantum mechanics, general relativity, multidimensional superstring theory, and fluid mechanics cascades from Planck to strong force freeze out scales with gravity balancing turbulent inertial-vortex forces. Interactions between Planck scale spinning and non-spinning black holes produce high Reynolds number turbulence and temperature mixing with huge Reynolds stresses driving the rapid inflation of space. Kolmogorovian turbulent temperature patterns are fossilized as strong-force exponential inflation stretches them beyond the scale of causal connection ct where c is light speed and t is time. Fossil temperature turbulence patterns seed nucleosynthesis, and then hydro-gravitational structure formation in the plasma epoch, Gibson (1996, 2000). Evidence about formation mechanisms is preserved by cosmic microwave background temperature anisotropies. CMB spectra indicate hydr...

  6. Efecto del enlatado en aceite y salmuera y su posterior almacenamiento sobre los lípidos de la bacoreta (Euthynnus alletteratus

    Directory of Open Access Journals (Sweden)

    Aubourg, Santiago P.

    1995-04-01

    Full Text Available Changes produced in the lipid fraction of Little Tunny during canning in oil and in brine and during its subsequent storage were studied in order to compare the effect of both dipping procedures. The effect of the type of covering medium on both the total lipid composition and on the phospholipid fraction was determined.
    Canning in oil was shown to lead to certain changes in the composition of the final product, there being a decrease in the phospholipid and fatty acid (16:0,18:0, 20:4ω6, 20:5ω3, 24:1ω9 and 22:6ω content of the total lipids. Furthermore, the presence of triglycerides in the oil used for canning leads to increases in some fatty acids (oleic and linoleic in the samples. The lipid content of samples canned in brine were lower than initial values. This difference due to processing was not detected in samples canned in oil.
    The phospholipid study showed the presence of 1-O-alk-1-enyl-ether chains, the qualitative and quantitative composition of which was studied. The thermal treatment Involved in both dipping procedures provoked a sharp decrease in the plasmalogen content, while the polyunsaturated fatty acid composition was significantly lower ¡n the oil canned samples than in the raw samples. This decrease due to processing can be explained as an effect of the heat and of the extraction capacity of the oil.

    Se estudiaron los cambios producidos en la fracción lipídica de la bacoreta como resultado de su enlatado en dos modalidades distintas (aceite vegetal y salmuera y su posterior almacenamiento. El efecto del medio de cobertura se estudió sobre la composición lipídica total y sobre la fracción fosfolipídica.
    La comparación de los dos tipos de enlatado demostró que la presencia del aceite de cobertura puede provocar modificaciones en la composición del producto final como el descenso del contenido de fosfolípidos y de numerosos ácidos grasos (16:0,18:0,20:4ω6, 20:5ω3, 24:ω9 y 22:6ω3

  7. Environmental and economic evaluation of energy recovery from agricultural and forestry residues

    Energy Technology Data Exchange (ETDEWEB)

    None

    1980-09-01

    Four conversion methods and five residues are examined in this report, which describes six model systems: hydrolysis of corn residues, pyrolysis of corn residues, combustion of cotton-ginning residues, pyrolysis of wheat residues, fermentation of molasses, and combustion of pulp and papermill wastes. Estimates of material and energy flows for those systems are given per 10/sup 12/ Btu of recovered energy. Regional effects are incorporated by addressing the regionalized production of the residues. A national scope cannot be provided for every residue considered because of the biological and physical constraints of crop production. Thus, regionalization of the model systems to the primary production region for the crop from which the residue is obtained has been undertaken. The associated environmental consequences of residue utilization are then assessed for the production region. In addition, the environmental impacts of operating the model systems are examined by quantifying the residuals generated and the land, water, and material requirements per 10/sup 12/ Btu of energy generated. On the basis of estimates found in the literature, capital, operating, and maintenance cost estimates are given for the model systems. These data are also computed on the basis of 10/sup 12/ Btu of energy recovered. The cost, residual, material, land, and water data were then organized into a format acceptable for input into the SEAS data management program. The study indicates that the most serious environmental impacts arise from residue removal rather than from conversion.

  8. Combustion Properties of Straw Briquettes

    Directory of Open Access Journals (Sweden)

    Zhao Qing-ling

    2013-05-01

    Full Text Available The low bulk density of straw is one of the major barriers, which blocks the collection, handling, transportation and storage. Densification of biomass into briquettes/pellets is a suitable method of increasing the bulk density of biomass. Yet in the process, a tremendous amount of air is ejected from biomass grind, which brings substantial specific variation including combustion property. Among them, combustion property is critical for proper design and operation of burning facilities. Therefore, a series of tests about combustion properties of 75mm diameter corn briquettes were done. First, the combustion process (ignition, full flaming and glowing phases., precipitation of tar were investigated by a heating stove, then, Some ash sample from the muffle burner was subjected to an ash melting characteristic test. The results show the combustion of briquettes takes more time than that of raw straw from ignition to complete combustion; in order to meet complete combustion in a short time, the raw straw needs more supply air volume than briquettes under the same α value; the temperature of furnace chamber should been controlled under 900°C, which help to reduce the dark smoke, tar and slag.

  9. Filtration combustion: Smoldering and SHS

    Science.gov (United States)

    Matkowsky, Bernard J.

    1995-01-01

    Smolder waves and SHS (self-propagating high-temperature synthesis) waves are both examples of combustion waves propagating in porous media. When delivery of reactants through the pores to the reaction site is an important aspect of the process, it is referred to as filtration combustion. The two types of filtration combustion have a similar mathematical formulation, describing the ignition, propagation and extinction of combustion waves in porous media. The goal in each case, however, is different. In smoldering the desired goal is to prevent propagation, whereas in SHS the goal is to insure propagation of the combustion wave, leading to the synthesis of desired products. In addition, the scales in the two areas of application may well differ. For example, smoldering generally occurs at a relatively low temperature and with a smaller propagation velocity than SHS filtration combustion waves. Nevertheless, the two areas of application have much in common, so that mechanisms learned about in one application can be used to advantage in the other. In this paper we discuss recent results in the areas of filtration combustion.

  10. La industria invisible. La producción de aceites en Argentina y Santa Fe, 1895-1940

    Directory of Open Access Journals (Sweden)

    Norma Lanciotti

    2014-03-01

    Full Text Available El artículo analiza la evolución de la industria aceitera argentina desde fines del siglo XIX hasta la segunda guerramundial, con especial atención a la participación de la provincia de Santa Fe en la actividad. El objetivo es anali-zar la industria aceitera en el largo plazo, evaluando los obstáculos y condiciones que limitaron su despegue antesde los años 1940, así como las condiciones que favorecieron su desarrollo antes de la formación del complejooleaginoso sojero. Se reconstruye la evolución de la producción e industrialización de maní, lino y maíz en Ar-gentina y en Santa Fe, la evolución de las exportaciones e importaciones de aceites vegetales y las políticas eco-nómicas que incidieron en la actividad.

  11. ESTUDIO DE SULFUROS DE MOLIBDENO GENERADOS MEDIANTE LA DESCOMPOSICIÓN TÉRMICA DE EMULSIONES AGUA/ACEITE

    Directory of Open Access Journals (Sweden)

    Ismael González

    2011-01-01

    Full Text Available Fueron preparados sólidos sulfurados tipo MoS2 mediante la descomposición térmica de emulsiones agua/aceite (W/O, incorporando en su fase acuosa heptamolibdato de amonio ((NH46Mo7O24.4H2O y un agente sulfurante, con el fin de evaluar fases activas que pudieran generarse en novedosos ca talizadores ultradispersos para conversión de hidrocarburos. Los sólidos fueron caracterizados por espectroscopia fotoelectrónica de rayos-x (XPS, oxidación a temperatura programada (TPO y análisis químico elemental. Los resultados de XPS revelaron que los sólidos presentan una superficie enriquecida en azufre, así como una significativa estabilidad a la oxidación por exposición al aire. Se comprobó que la cantidad de agente sulfurante presente originalmente en la emulsión es crucial para controlar la estequiometría de los sulfuros sintetizados. Los perfiles de oxidación permitieron diferenciar varios tipos de S y C, y muestran que ambos elementos tienden a oxidarse simultáneamente, sugiriendo que ambos elementos están íntimamente asociados en la estructura de estos materiales.

  12. Costos ambientales en el proceso de extracción del aceite de palma. Estudio de un caso

    Directory of Open Access Journals (Sweden)

    Doris C. Reinosa Pulido

    2009-01-01

    Full Text Available El objetivo de la presente investigación es establecer los factores que inciden en la conformación de los costos ambientales en el procesamiento de extracción del aceite de palma en la planta procesadora Palmeras San Simón, en el Municipio Colón, Estado Zulia. La investigación se enmarca dentro de la contabilidad financiera, sobre la base de los costos internos. El tipo de investigación es descriptiva, de campo, las técnicas utilizadas fueron la entrevista, la observación directa y el cuestionario. Se obtuvieron los siguientes resultados: 1 La empresa conoce los principales efluentes, impacto ambiental y ha establecido acciones tendentes a mejorar su gestión, aunque no existe un departamento formal de gestión ambiental. (2 No existe vinculación entre el departamento de contabilidad y la gestión ambiental ejecutada. (3 El sistema contable no permita establecer los costos ambientales. Se concluyó lo siguiente: Se debe implantar una metodología que permita acumular los costos ambientales donde se imputen al costo del producto, actividad o periodo, y no segregarlos en un centro de costos ambientales separado.

  13. ANÁLISIS ESPACIAL DE LA CORRELACIÓN ENTRE CULTIVO DE PALMA DE ACEITE Y DESPLAZAMIENTO FORZADO EN COLOMBIA

    Directory of Open Access Journals (Sweden)

    Camilo Rey Sabogal

    2013-12-01

    Full Text Available En este artículo se examina la existencia de una posible correlación entre cultivos de palma de aceite y el desplazamiento forzado en Colombia. Este análisis se plantea con la perspectiva de la econometría espacial porque se identificó autocorrelación y clústeres en las variables entre las unidades geográficas municipales. Por ello se emplea la estrategia regresión geográficamente ponderada, la cual estima ecuaciones municipales que tienen en cuenta el comportamiento de las variables en los municipios vecinos. Como resultado se encontró un patrón de relación directa entre cultivos de palma y desplazamiento en unidades geográficas en el cual los cultivos se impulsaron en la última década. Se debe aclarar que este artículo no evalúa aún la relación de causalidad entre las variables, aspecto que requiere nuevos datos y ajustes metodológicos.

  14. Componente del insaponificable del aceite de oliva con polaridad comprendida entre el escualeno y los alcoholes triterpénicos

    Directory of Open Access Journals (Sweden)

    Lanzón, A.

    1992-10-01

    Full Text Available In the unsaponifiable matter of refined olive oils and, frequently, virgin olive oils of bad quality, a new compound with polarity between those of squalene and triterpenic alcohols was isolated. Mass spectrometry of this compound and of their hydrogenated and; sililated derivatives, demonstrated that the compound was a long chain alcohol having 426 of molecular weight, polyisoprenic structure similar to that of squalene, and the hydroxyl group attached at the C-2 carbon atom.

    Se ha estudiado y determinado la estructura de un compuesto, de polaridad comprendida entre el escualeno y los alcoholes triterpénicos, que se encuentra en el insaponificable de los aceites de oliva refinados y en muchas ocasiones en el de los vírgenes, sobre todo en los de baja calidad. La espectrometría de masas del mismo y, de sus derivados hidrogenado y sililado, ha puesto de manifiesto que se trata de un alcohol triterpénico lineal, de peso molecular 426, con el esqueleto similar al del escualeno y con el grupo hidroxilo en posición 2.

  15. Caracterización del color de los aceites de oliva vírgenes de cultivares catalanes

    Directory of Open Access Journals (Sweden)

    Tous Martí, J.

    1992-12-01

    Full Text Available Colour variation of virgin oil from 34 olive cultivars growing in Catalonia (Spain was analyzed by the ABT (Bromthymol Blue modified method. In addition, the preferences of consumers in the Denomination of Origin Siurana (Tarragona were studied, in relation to coloration. The results obtained show that varietal differences exist in the colour index studied and that the commercial preferences vary according to the oil markets.

    Se analizan mediante el método ABT (Azul de Bromotimol modificado, las variaciones del color de los aceites vírgenes provenientes de 34 variedades de olivo cultivadas en Cataluña y, al mismo tiempo, se estudian las preferencias de los consumidores de la Denominación de Origen Siurana (Tarragona, en cuanto a tonalidades de color. Los resultados obtenidos indican que existen diferencias varietales en los índices de color estudiados y que las preferencias comerciales varían según los mercados oleícolas.

  16. Pyrolytic characteristics of burning residue of fire-retardant wood

    Institute of Scientific and Technical Information of China (English)

    ZHAO Guangjie; LUO Wensheng; Furuno T; REN Qiang; MA Erni

    2007-01-01

    In order to investigate the pyrolytic characteristics of the burning residue of fire-retardant wood,a multifunctional fire-resistance test oven aimed at simulating the course of a fire was used to burn fire-retardant wood and untreated wood.Samples at different distances from the combustion surface were obtained and a thennogravimetric analysis (TG) was applied to test the pyrolytic process of the burning residue in an atmosphere of nitrogen.The results showed that:1) there was little difference between fireretardant wood and its residue in the initial temperature of thermal degradation.The initial temperature of thermal degradation of the combustion layer in untreated wood was higher than that in the no burning wood sample;2) the temperature of the flame retardant in fire-retardant wood was 200℃ in the differential thermogravimetry (DTG).The peak belonging to the flame retardant tended to dissipate during the time of burning;3) for the burning residue of fire-retardant wood,the peak belonging to hemicellulose near 230℃ in the DTG disappeared and there was a gentle shoulder from 210 to 240℃;4) the temperature of the main peaks of the fireretardant wood and its burning residue in DTG was 100℃ lower than that of the untreated wood and its burning residue.The rate of weight loss also decreased sharply;5) the residual weight of fire-retardant wood at 600~C clearly increased compared with that of untreated wood.Residual weight of the burning residue increased markedly as the heating temperature increased when burning;6) there was a considerable difference with respect to the thermal degradation temperature of the no burning sample and the burning residue between fire-retardant wood and untreated wood.

  17. Catalytic Combustion of Gasified Waste

    Energy Technology Data Exchange (ETDEWEB)

    Kusar, Henrik

    2003-09-01

    This thesis concerns catalytic combustion for gas turbine application using a low heating-value (LHV) gas, derived from gasified waste. The main research in catalytic combustion focuses on methane as fuel, but an increasing interest is directed towards catalytic combustion of LHV fuels. This thesis shows that it is possible to catalytically combust a LHV gas and to oxidize fuel-bound nitrogen (NH{sub 3}) directly into N{sub 2} without forming NO{sub x} The first part of the thesis gives a background to the system. It defines waste, shortly describes gasification and more thoroughly catalytic combustion. The second part of the present thesis, paper I, concerns the development and testing of potential catalysts for catalytic combustion of LHV gases. The objective of this work was to investigate the possibility to use a stable metal oxide instead of noble metals as ignition catalyst and at the same time reduce the formation of NO{sub x} In paper II pilot-scale tests were carried out to prove the potential of catalytic combustion using real gasified waste and to compare with the results obtained in laboratory scale using a synthetic gas simulating gasified waste. In paper III, selective catalytic oxidation for decreasing the NO{sub x} formation from fuel-bound nitrogen was examined using two different approaches: fuel-lean and fuel-rich conditions. Finally, the last part of the thesis deals with deactivation of catalysts. The various deactivation processes which may affect high-temperature catalytic combustion are reviewed in paper IV. In paper V the poisoning effect of low amounts of sulfur was studied; various metal oxides as well as supported palladium and platinum catalysts were used as catalysts for combustion of a synthetic gas. In conclusion, with the results obtained in this thesis it would be possible to compose a working catalytic system for gas turbine application using a LHV gas.

  18. Regulation possibilities of biomass combustion

    Science.gov (United States)

    Suzdalenko, Vera; Gedrovics, Martins; Zake, Maija; Barmina, Inesa

    2012-11-01

    The focus of the recent experimental research is to analyze the regulation possibilities of biomass combustion. Three possibilities were chosen as part of this research: a) biomass cofiring with propane, b) swirling flow with re-circulation zone, and c) use of a permanent magnet. The aim of the research is to provide stable, controllable and effective biomass combustion with minimum emissions. The special pilot device was created where biomass can be combusted separately and co-fired with propane. Wood pellets were used during the experiments.

  19. On Lean Turbulent Combustion Modeling

    Directory of Open Access Journals (Sweden)

    Constantin LEVENTIU

    2014-06-01

    Full Text Available This paper investigates a lean methane-air flame with different chemical reaction mechanisms, for laminar and turbulent combustion, approached as one and bi-dimensional problem. The numerical results obtained with Cantera and Ansys Fluent software are compared with experimental data obtained at CORIA Institute, France. First, for laminar combustion, the burn temperature is very well approximated for all chemical mechanisms, however major differences appear in the evaluation of the flame front thickness. Next, the analysis of turbulence-combustion interaction shows that the numerical predictions are suficiently accurate for small and moderate turbulence intensity.

  20. Environmental and economic evaluations of energy recovery from agricultural and forestry residues

    Energy Technology Data Exchange (ETDEWEB)

    Harper, J.P.; Antonopoulos, A.A.; Sobek, A.A.

    1979-08-01

    Agricultural and forestry residues have been converted to energy for centuries. The technologies employed range from straightforward approaches such as combustion to produce heat to more involved approaches such as pyrolysis of the residues to produce medium-Btu synthetic gas, charcoal, and oil. Thus there is no one technology that can be characterized as the best or most promising for conversion of agricultural and forestry residues into energy. Therefore, to accurately assess the potential of agricultural and forestry residues as energy resources, an array of current conversion options should be addressed. Four conversion methods and five residues are examined in this report, which describes six model systems: hydrolysis of corn residues, pyrolysis of corn residues, combustion of cotton-ginning residues, pyrolysis of wheat residues, fermentation of molasses, and combustion of pulp and papermill wastes. Estimates of material and energy flows for those systems are given per 10/sup 12/ Btu of recovered energy. Regional effects are incorporated by addressing the regionalized production of the residues. A national scope cannot be provided for every residue considered because of the biological and physical constraints of crop production. Thus, regionalization of the model systems to the primary production region for the crop from which the residue is obtained has been undertaken. The associated environmental consequences of residue utilization are then assessed for the production region. In addition, the environmental impacts of operating the model systems ae examined. On the basis of estimates found in the literature, capital, operating, and maintenance cost estimates are given for the model systems. The study indicates that the most serious environmental impacts arise from residue removal rather than from conversion.

  1. Tratamiento enzimático en la extracción de aceite y obtención de antioxidantes a partir de semilla de onagra, Oenothera biennis, por prensado en frío

    Directory of Open Access Journals (Sweden)

    Zúñiga, María E.

    2007-03-01

    Full Text Available The aim of this work was to improve the yield in evening primrose oil extraction and the antioxidant potential of the residual meal using an enzyme assisted extraction process with cold pressing. Among four commercial enzymes, a mixture of two of them was selected in order to evaluate the effect of enzyme-substrate ratio, temperature, moisture and period of time of the enzymatic pretreatment on the extracted oil. The oil yield increased by 12% when the seeds were pretreated with 2% enzyme-substrate ratio of a mixture of 100G Ultrazym and Cellubrix (1:1 for 15 h at 40oC and 40% moisture. The defatted meal obtained from the enzyme aided process enhanced its phenol content and improved its potential antioxidant activity in comparison to the control from 250 to 276 mg of phenols/g of meal and from 1463 to 1558 mg of trolox/g of meal respectively.Se espera que el tratamiento enzimático, previo al prensado en frío, de la semilla de Oenothera biennis, mejore el rendimiento de extracción de aceite y la cantidad de antioxidantes extraídos de la harina residual. De una serie de cuatro preparados enzimáticos comerciales, se selecciona el más adecuado, el cual es evaluado bajo distintas condiciones de incubación: razones enzima/sustrato, tiempo, humedad y temperatura. El rendimiento aumenta un 12 % cuando se realiza un doble prensado sobre la semilla tratada con una mezcla enzimática formulada con Ultrazym 100G y Cellubrix en razón 1:1, concentración enzima/sustrato del 2 % p/p (base húmeda, durante 15 horas de incubación a 45 °C y 40 % de humedad. La harina residual desgrasada aumenta su contenido de antioxidantes desde 250 a 276 mg de fenoles expresados en catequina y el extracto mejora su actividad antioxidante desde 1463 a 1558 mg de trolox por gr de harina.

  2. THE COMBUSTION ACTION VERIFICATION AND ESTIMATE OF COMBUSTION EFFICIENCY IN AVIATION GAS#TURBINE ENGINE COMBUSTION CHAMBERS

    OpenAIRE

    2011-01-01

    Verification results of combustion action simulating and estimate of calculation combustion efficiency that was given by simulating were shown. Mathematical model and its assumption are described. Execution calculations method was shown. Results of simulating are shown; their comparative analyses with results of experiment were executed. Accuracy of combustion action mathematical modeling by combustion efficiency in model with oneand two-stage reactions of combustion was estimated. The infere...

  3. Computational Modeling of Turbulent Spray Combustion

    NARCIS (Netherlands)

    Ma, L.

    2016-01-01

    The objective of the research presented in this thesis is development and validation of predictive models or modeling approaches of liquid fuel combustion (spray combustion) in hot-diluted environments, known as flameless combustion or MILD combustion. The goal is to combine good physical insight, a

  4. Measures for a quality combustion (combustion chamber exit and downstream); Mesures pour une combustion de qualite (sortie de chambre de combustion et en aval)

    Energy Technology Data Exchange (ETDEWEB)

    Epinat, G. [APAVE Lyonnaise, 69 (France)

    1996-12-31

    After a review of the different pollutants related to the various types of stationary and mobile combustion processes (stoichiometric, reducing and oxidizing combustion), measures and analyses than may be used to ensure the quality and efficiency of combustion processes are reviewed: opacimeters, UV analyzers, etc. The regulation and control equipment for combustion systems are then listed, according to the generator capacity level

  5. “Bio” combustibles o el mito del oro verde ¿Política ambiental, “exportación de naturaleza”, o etnocidio?

    Directory of Open Access Journals (Sweden)

    Anne-Lise Naizot

    2013-09-01

    Full Text Available El término “biocombustible” se refiere en su aceptación general a los combustibles que pueden ser obtenidos a partir de biomasa, de leña, y de más de 14 variedades de cultivos (caña de azúcar, soya, palma aceitera, ricino, maíz, colza, girasol, sorgo, trigo, mandioca, etc.. Los dos “biocombustibles”, “bio”etanol y “bio”diesel, son obtenidos, respectivamente, por fermentación de productos ricos en azúcares, almidones o celulosas (bioetanol y de aceites vegetales como la palma africana, girasol, higuerilla, soya, etc. (biodiesel

  6. Modelling of turbulent combustion in the blast furnace raceway

    Energy Technology Data Exchange (ETDEWEB)

    Karvinen, R.; Maekiranta, R. [Tampere Univ. (Finland). Energy and Process Engineering

    1996-12-31

    The phenomena concerning coke-gas -suspension and simultaneous combustion of solid coke particles and residual fuel oil in a blast furnace raceway are modelled. The flow field of suspension is predicted by using the two fluid model, which is based on the Eulerian method, in the Phoenics code. The standard k-e -model of turbulence is used. Pyrolysis of oil droplets is calculated with the own coded subroutine, which is based on the Lagrangian approach. Gas phase reaction rate is assumed to be controlled by chemical kinetics. Radiative heat transfer is calculated by using the six-flux method. Heterogenous surface reactions are used for the coke particles. Calculations without coke combustion show that due to a poor mixing in the hot blast, pyrolysis gases of residual fuel oil have not time enough to react with oxygen. It is obvious that if combustion of coke particles is taken into account, the oxygen content in the blast decreases to such a level, that unburnt pyrolysis gases can flow out of the raceway causing problems. The distribution of coke void fraction has been succeeded to predict in the raceway domain. Coke particles fall from the upper part of the raceway to the hot blast forming locally high concentrations, which affect very strongly the oxygen distribution of the hot blast. (orig.) SULA 2 Research Programme; 10 refs.

  7. Combustion Characteristics of Coated Nano Aluminum in Composite Propellants

    Directory of Open Access Journals (Sweden)

    Yunlan Sun

    2006-10-01

    Full Text Available The effects of coated nano-sized aluminum (Al powder (n-Al and micron-sized Al powder(g-Al in propellants on the burning rate and pressure exponent have been investigated. Theresults show that the burning rates of propellants increase as the n-Al content increases, butthe burning rate pressure exponents tend to decrease. Compared with propellant containing-Al, the increments of burning rates of propellants containing n-Al powder reduce graduallywith increase in the pressure because of the differences of the combustion characteristics andignition performances of n-Al powder and g-Al powder. Single short distance photograph, scanningelectron microscopy, x-ray fluorescence analysis were used to characterise the flame image,combustion phenomena, the quenched surface image, and surface elements. A substantialdifference in combustion characteristics of n-Al powder has been found in comparison with-Al powder. In addition, oxygen-bomb combustion heat, ignition temperature, and recoveryratio of residues were measured.

  8. Flameless Combustion for Gas Turbines

    Science.gov (United States)

    Gutmark, Ephraim; Li, Guoqiang; Overman, Nick; Cornwell, Michael; Stankovic, Dragan; Fuchs, Laszlo; Milosavljevic, Vladimir

    2006-11-01

    An experimental study of a novel flameless combustor for gas turbine engines is presented. Flameless combustion is characterized by distributed flame and even temperature distribution for high preheat air temperature and large amount of recirculating low oxygen exhaust gases. Extremely low emissions of NOx, CO, and UHC are reported. Measurements of the flame chemiluminescence, CO and NOx emissions, acoustic pressure, temperature and velocity fields as a function of the preheat temperature, inlet air mass flow rate, exhaust nozzle contraction ratio, and combustor chamber diameter are described. The data indicate that larger pressure drop promotes flameless combustion and low NOx emissions at the same flame temperature. High preheated temperature and flow rates also help in forming stable combustion and therefore are favorable for flameless combustion.

  9. Combustion of boron containing compositions

    Energy Technology Data Exchange (ETDEWEB)

    Frolov, Y.; Pivkina, A. [Institute of Chemical Physics, Russian Academy of Science, Moscow (Russian Federation)

    1996-12-31

    Boron is one of the most energetic components for explosives, propellants and for heterogeneous condensed systems in common. The combustion process of mixtures of boron with different oxidizers was studied. The burning rate, concentration combustion limits, the agglomeration and dispersion processes during reaction wave propagation were analysed in the respect of the percolation theory. The linear dependence of the burning rate on the contact surface value was demonstrated. The percolative model for the experimental results explanation is proposed. (authors) 5 refs.

  10. Smoldering Combustion Experiments in Microgravity

    Science.gov (United States)

    Walther, David C.; Fernandez-Pello, A. Carlos; Urban, David L.

    1997-01-01

    The Microgravity Smoldering Combustion (MSC) experiment is part of a study of the smolder characteristics of porous combustible materials in a microgravity environment. Smoldering is a non-flaming form of combustion that takes place in the interior of porous materials and takes place in a number of processes ranging from smoldering of porous insulation materials to high temperature synthesis of metals. The objective of the study is to provide a better understanding of the controlling mechanisms of smolder, both in microgravity and normal-gravity. As with many forms of combustion, gravity affects the availability of oxidizer and transport of heat, and therefore the rate of combustion. Microgravity smolder experiments, in both a quiescent oxidizing environment, and in a forced oxidizing flow have been conducted aboard the NASA Space Shuttle (STS-69 and STS-77 missions) to determine the effect of the ambient oxygen concentration and oxidizer forced flow velocity on smolder combustion in microgravity. The experimental apparatus is contained within the NASA Get Away Special Canister (GAS-CAN) Payload. These two sets of experiments investigate the propagation of smolder along the polyurethane foam sample under both diffusion driven and forced flow driven smoldering. The results of the microgravity experiments are compared with identical ones carried out in normal gravity, and are used to verify present theories of smolder combustion. The results of this study will provide new insights into the smoldering combustion process. Thermocouple histories show that the microgravity smolder reaction temperatures (Ts) and propagation velocities (Us) lie between those of identical normal-gravity upward and downward tests. These observations indicate the effect of buoyancy on the transport of oxidizer to the reaction front.

  11. Characterisation of ashes produced by co-combustion of recovered fuels and peat

    Energy Technology Data Exchange (ETDEWEB)

    Frankenhaeuser, M. [Borealis Polymers Oy, Porvoo (Finland)

    1997-10-01

    The current project focuses on eventual changes in ash characteristics during co-combustion of refuse derived fuel with coal, peat, wood or bark, which could lead to slagging, fouling and corrosion in the boiler. Ashes were produced at fluidised bed (FB) combustion conditions in the 15 kW reactor at VTT Energy, Jyvaeskylae, the fly ash captured by the cyclone was further analysed by XRF at Outokumpu Geotechnical Laboratory, Outokumpu. The sintering behaviour of these ashes was investigated using a test procedure developed at the Combustion Chemistry Research Group at Aabo Akademi University. The current extended programme includes a Danish refuse-derived fuel (RDF), co-combusted with bark/coal (5 tests) and wood/coal (2 tests), a RF from Jyvaskyla (2 tests with peat/coal) and de-inking sludges co- combusted at full-scale with wood waste or paper mill sludge (4 ashes provided by IVO Power). Ash pellets were thermally treated in nitrogen in order to avoid residual carbon combustion. The results obtained show no sintering tendencies below 600 deg C, significant changes in sintering are seen with pellets treated at 1000 deg C. Ash from 100 % RDF combustion does not sinter, 25 % RDF co-combustion with wood and peat, respectively, gives an insignificant effect. The most severe sintering occurs during co-combustion of RDF with bark. Contrary to the earlier hypothesis a 25 % coal addition seems to have a negative effect on all fuel blends. Analysis of the sintering results versus ash chemical composition shows, that (again), in general, an increased level of alkali chlorides and sulphates gives increased sintering. Finally, some results on sintering tendency measurements on ashes from full-scale CFB co-combustion of deinking sludge with wood waste and paper mill sludge are given. This shows that these ashes show very little, if any, sintering tendency, which can be explained from ash chemistry

  12. Internal combustion engine

    Energy Technology Data Exchange (ETDEWEB)

    Laskaris, M.A.; Broitman, K.; Natale, S.E.

    1991-08-27

    This patent describes improvement in a two-stroke internal combustion engine adapted to run on a diesel or a kerosene type of fuel, and including a piston connected to the crankshaft of the engine to move within a cylinder through a first stroke from a top dead center position to a bottom dead center position and through a second stroke from the bottom dead center position back to the top dead center position. The improvement comprises: means providing a cylinder head at the top end of the engine cylinder in the shape of an open bowl having a generally cup-shaped configuration including a sidewall portion, a spark plug positioned centrally within the bowl at the top end of the cylinder, and means for injecting fuel into the top end of the engine cylinder at a location between the spark plug and the sidewall portion, the fuel injecting means including an injection nozzle having a plurality of nozzle openings therein, the nozzle openings being constructed and arranged to discharge a plurality of plume-like sprays into the top end of the cylinder at a location within the bowl, two of the sprays being directed from the nozzle to diverge and pass along opposite sides of the spark plug, and additional sprays being directed from the nozzle against the sidewall portion or the cylinder head to be deflected therefrom back toward the piston and the spark plug to thereby form a cloud of fuel over the spark plug for good ignition.

  13. Rotary internal combustion engine

    Energy Technology Data Exchange (ETDEWEB)

    Witkowski, J.

    1989-12-05

    This patent describes an internal combustion engine assembly. It includes: a central rotor means formed with at least one peripheral fuel cavity. The cavity having a first surface defining a thrust surface and a second surface defining a contoured surface; a housing means enclosing the rotor and having an internal wall encircling the rotor. The internal wall being intercepted by at least two recesses defining cylinder means. The housing means and the rotor means being relatively rotatable; piston means individual to each the cylinder means and reciprocable therein; each piton means having a working face complementary to aid contoured surface; and power means for urging the working face into intimate areal contact with the contoured surface to create a first seal means. The housing means having at lest one fuel inlet port, at least one fuel ignition means and at least one exhaust port whereby during the course of a revolution of the rotor means relative to the housing means, the first seal means, the power means, the respective ports, the ignition means and the fuel cavity cooperate to develop fuel compression, fuel ignition and exhaust functions.

  14. Thermogravimetric analysis of co-combustion between microalgae and textile dyeing sludge.

    Science.gov (United States)

    Peng, Xiaowei; Ma, Xiaoqian; Xu, Zhibin

    2015-03-01

    The synergistic interaction and kinetics of microalgae, textile dyeing sludge and their blends were investigated under combustion condition by thermogravimetric analysis. The textile dyeing sludge was blended with microalgae in the range of 10-90wt.% to investigate their co-combustion behavior. Results showed that the synergistic interaction between microalgae and textile dyeing sludge improved the char catalytic effect and alkali metals melt-induced effect on the decomposition of textile dyeing sludge residue at high temperature of 530-800°C. As the heating rate increasing, the entire combustion process was delayed but the combustion intensity was enhanced. The lowest average activation energy was obtained when the percentage of microalgae was 60%, which was 227.1kJ/mol by OFW and 227.4kJ/mol by KAS, respectively.

  15. Olive oil-diet improves the simvastatin effects with respect to sunflower oil-diet in men with increased cardiovascular risk: A preliminary study Las dietas conteniendo aceite de oliva mejoran los efectos de simvastatina respecto a dietas con aceite de girasol en hombres con riesgo cardiovascular elevado: Estudio preliminar

    Directory of Open Access Journals (Sweden)

    F. J. Sánchez-Muniz

    2009-06-01

    Full Text Available Background and aims: Concomitant intake of statins together with certain foods may affect their therapeutic effects. The purpose of this preliminary study was to determine the modulating effect of two culinary oils on the hypolipemic effect of statins. Subject and Methods: Twenty-five men with severe hypercholesterolemia and high estimate cardiovascular risk (> 20% according to the Adult Treatment Panel III of USA National Institutes of Health, ATP-III were enrolled in an observational follow-up study to test lipoprotein profile changes after ix month 20-mg/d Simvastatin treatment. Thirteen volunteers using sunflower oil as the habitual culinary fat, and 12 using olive oil, were selected by non-probabilistic incidental sampling. Volunteers consent in follow their habitual diets and to maintain diet characteristics throughout the study. Diet was evaluated through the study by three 24-h recalls and a food frequency questionnaire. Results: The energy contribution of fat (P = 0.019 and MUFA (P Introducción y objetivos: La ingesta de algunos alimentos junto con estatinas puede afectar los efectos terapéuticos del fármaco. Este estudio preliminar pretende determinar el efecto modulador de dos tipos de aceites culinarios sobre los efectos hipolipemiantes de las estatinas. Métodos: Mediante muestreo no probabilístico, 25 hombres con hipercolesterolemia severa y alto riesgo cardiovascular (> 20% según el Panel III para tratamiento de adultos de los Institutos de Salud USA, ATP-III participaron en el estudio observacional para ver los cambios en el perfil lipoproteico después de seis meses de tratamiento con 20 mg/día de Simvastatina. 13 voluntarios consumían habitualmente aceite de girasol como principal grasa culinaria y 12 aceite de oliva. Todos los sujetos consintieron en mantener sus hábitos alimentarios durante el estudio. Para evaluar la dieta se usaron 3 recuerdos de 24 horas y una frecuencia de consumo. Resultados: El aporte cal

  16. Selenium speciation in flue desulfurization residues.

    Science.gov (United States)

    Zhong, Liping; Cao, Yan; Li, Wenying; Xie, Kechang; Pan, Wei-Ping

    2011-01-01

    Flue gas from coal combustion contains significant amounts of volatile selenium (Se). The capture of Se in the flue gas desulfurization (FGD) scrubber unit has resulted in a generation of metal-laden residues. It is important to determine Se speciation to understand the environmental impact of its disposal. A simple method has been developed for selective inorganic Se(IV), Se(VI) and organic Se determination in the liquid-phase FGD residues by hydride generation atomic fluorescence spectrometry (AFS). It has been determined that Se(IV), Se(VI) and organic Se can be accurately determined with detection limits (DL) of 0.05, 0.06 and 0.06 microg/L, respectively. The accuracy of the proposed method was evaluated by analyzing the certified reference material, NIST CRM 1632c, and also by analyzing spiked tap-water samples. Analysis indicates that the concentration of Se is high in FGD liquid residues and primarily exists in a reduced state as selenite (Se(IV)). The toxicity of Se(IV) is the strongest of all Se species. Flue gas desulfurization residues pose a serious environmental risk.

  17. Selenium speciation in flue desulfurization residues

    Institute of Scientific and Technical Information of China (English)

    Liping Zhong; Yan Cao; Wenying Li; Kechang Xie; Wei-Ping Pan

    2011-01-01

    Flue gas from coal combustion contains significant amounts of volatile selenium (Se).The capture of Se in the flue gas desulfurization (FGD) scrubber unit has resulted in a generation of metal-laden residues.It is important to determine Se speciation to understand the environmental impact of its disposal.A simple method has been developed for selective inorganic Se(Ⅳ), Se(Ⅵ) and organic Se determination in the liquid-phase FGD residues by hydride generation atomic fluorescence spectrometry (AFS).It has been determined that Se(Ⅳ), Se(Ⅵ) and organic Se can be accurately determined with detection limits (DL) of 0.05, 0.06 and 0.06 μg/L, respectively.The accuracy of the proposed method was evaluated by analyzing the certified reference material, NIST CRM 1632c, and also by analyzing spiked tap-water samples.Analysis indicates that the concentration of Se is nigh in FGD liquid residues and primarily exists in a reduced state as selenite (Se(Ⅳ)).The toxicity of Se(Ⅳ) is the strongest of all Se species.Flue gas desulfurization residues pose a serious environmental risk.

  18. Fumigant Toxicity of some Essential Oils on Adults of some Stored-Product Pests Toxicidad Fumigante de Algunos Aceites Esenciales sobre Adultos de algunas Plagas de Productos Almacenados

    Directory of Open Access Journals (Sweden)

    Mohammad Mahmoudvand

    2011-03-01

    Full Text Available Plant materials with insecticidal properties have been traditionally used for generations in some parts of the world. In this study, fumigant toxicity of some essential oils extracted from Rosmarinus officinalis L., Mentha pulegium L., Zataria multiflora, and Citrus sinensis (L. Osbeck var. hamlin on adults of stored-product pests, including Tribolium castaneum, Sitophilus granarius, Callosobruchus maculatus, and Plodia interpunctella were investigated. Pure essential oils were used in glass vials for the bioassay. LC50 values of Citrus sinensis var. hamlin against T. castaneum, S. granarius, and C. maculatus were 391.28, 367.75, and 223.48 µL L-1 air after 24 h, 362.40, 20.45, and 207.17 µL L-1 air after 48 h, respectively. Furthermore, LC50 values of the fumigant test of C. sinensis and M. pulegium essential oils against S. granarius were 0.038 and 367.75 µL L-1 air after 24 h, 0.025 and 320.45 µL L-1 air after 48 h, respectively. On the other hand, LC50 values of R. officinalis and Z. multiflora on P. interpunctella moths were 0.93 and 1.75 µL L-1 after 24 h. Results showed that among tested essential oils, C. sinensis var. hamlin had good fumigant toxicity on T. castaneum, S. granarius, and C. maculatus. In addition, M. pulegium essential oil was stronger than C. sinensis var. hamlin on S. granarius. Results also indicated that both Z. multiflora and R. officinalis had fumigant toxicity on P. interpunctella adults. In summary, results indicated that these essential oils have good fumigant toxicity on stored-product pests.Materiales vegetales con propiedades insecticidas han sido usados tradicionalmente por generaciones en algunas partes del mundo. En este estudio se estudió la toxicidad fumigante de algunos aceites esenciales extraídos desde Rosmarinus officinalis L., Mentha pulegium L., Zataria multiflora y Citrus sinensis (L. Osbeck var. hamlin sobre adultos de plagas de productos almacenados, incluyendo Tribolium castaneum

  19. Influencia de diferentes coadyuvantes tecnológicos en la calidad y rendimiento del aceite de oliva virgen utilizando la metodología de superficies de respuesta

    Directory of Open Access Journals (Sweden)

    Moya Vilar, Manuel

    2008-03-01

    Full Text Available Response surface methodology was employed to evaluate the effects of two technological co-adjuvants in virgin olive oil extraction from the Hojiblanca olive variety with a low ripening index: the addition of talc during the malaxation of the olive paste step, water addition during the same step and olive paste storage over a small period of time. Ranges of operation were established as follows: talc addition, 0-2 % (w/w; water addition, 0-20 % (w/w; and storage time, 0-36 h. Mathematical models and statistical analyses (ANOVA were performed in order to evaluate the effects of theses factors on oil yield and quality of olive oils obtained. Using a confidence level of 95 %, oil yield, acidity, peroxide index, K270 and Chlorophyll contents, models are significant. The addition of talc is more effective in improving oil yield and paste storage is also useful to improve oil yield although a loss of oil quality is observed; but all the olive oil obtained may be characterized as extra virgin olive oil according to the regulations of the European Union.Se ha utilizado la metodología de superficies de respuesta para evaluar los efectos de dos coadyuvantes tecnológicos y otro factor en la extracción de aceite de oliva virgen procedente de aceitunas de la variedad Hojiblanca con bajo índice de madurez: adición de talco en la etapa de batido de la pasta, adición de agua en la misma etapa y almacenamiento de la pasta de aceituna durante un periodo corto de tiempo. Los rangos de operación han sido los siguientes: de 0% a 2% en la adición de talco, de 0% a 20% en la adición de agua y de 0 h a 36 h de tiempo de almacenamiento. Para evaluar los efectos de estos factores en el rendimiento y calidad de los aceites obtenidos se han construido modelos matemáticos y realizado análisis estadísticos (ANOVA. Para un nivel de confianza del 95%, los modelos de rendimiento en aceite, acidez, índice de peróxidos, K270 y contenido en clorofilas han resultado

  20. Co-sintering of treated APC-residues with bottom ash

    DEFF Research Database (Denmark)

    Bergfeldt, B.; Jensen, Dorthe Lærke; Vehlow, J.;

    2001-01-01

    the influence of co-sintering of Ferrox products with bottom ashes on the quality of the residues and the effects on the combustion process. Only few elements showed higher concentrations in the bottom ashes of these co-combustion tests compared to reference tests. No significant effect on the leaching...... behaviour of the bottom ashes could be found. During the co-combustion process an increase in SO2 concentrations in the raw gas and slightly lower temperatures in the fuel bed could be observed....

  1. Propiedades magnetorreológicas en mezclas de aceite automotor con partículas metálicas

    Directory of Open Access Journals (Sweden)

    Marco Antonio Ardila B Álvaro Hernando Forero P

    2010-12-01

    Full Text Available Un  fluido magnetorreológico  (MR  es  un  líquido aceitoso que exhibe una densidad aproximadamente tres veces mayor que la del agua. A este fluido se le puede cambiar de un estado aceitoso a uno cuasisólido en fracciones de segundo, cuando es expuesto a una densidad de campo magnético [1].En  este  artículo  se  presentan  los  resultados  de  un estudio  comparativo  realizado  a  dos mezclas  de prueba, compuestas por dos tipos diferentes de aceite automotor, para las cuales se hizo variar los niveles de concentración y el tipo de partículas metálicas en suspensión.  Luego  de  ejecutar  un  procedimiento científico basado en un diseño experimental factorial se observaron cambios significativos en la viscosidaddel fluido al variar la densidad del campo magnético para  cada mezcla. Esto permite  concluir  que, para los fluidos experimentados, es factible el proceso de caracterización de componentes y optimización para las  relaciones  de  mezcla  en  observancia  de aplicaciones mecánicas y civiles.

  2. Metaanálisis del uso de semillas y aceites en la dieta de ovejas y cabras

    Directory of Open Access Journals (Sweden)

    Andrés Luis Martínez Marín

    2015-09-01

    Full Text Available Resumen:El objetivo de este trabajo fue utilizar el metaanálisis para estudiar los resultados productivos de ovejas y cabras de ordeño, alimentadas con aceites y semillas ricas en ácidos grasos insaturados. Se utilizaron 22 experimentos con ovejas (63 tratamientos y 21 con cabras (76 tratamientos. El consumo medio de grasa extra fue de 83,6±33,6 g por día en ovejas y 73,4±38,7 g por día en cabras. En ovejas, la grasa extra no afectó al consumo de materia seca, pero aumentó la producción de grasa (de 91,4 a 98,8 g por día y redujo el contenido proteico (de 5,41 a 5,24% de la leche. No hubo diferencias en el extracto quesero. En cabras, la inclusión de grasa en la dieta redujo el consumo de materia seca (de 2,13 a 2,08 kg por día y aumentó el porcentaje de grasa láctea (de 4,11 a 4,43% y el extracto quesero (de 7,41 a 7,76%. La respuesta productiva de ovejas y cabras al consumo de dietas ricas en ácidos grasos insaturados es diferente. Sin embargo, el valor comercial de la leche no se ve afectado, debido a la ausencia de efectos negativos sobre el extracto quesero en ambas especies.

  3. SnO2 COMO CATALIZADOR Y SOPORTE DE Ni Y Sn EN LA ALCOHOLISIS DEL ACEITE DE PALMA

    Directory of Open Access Journals (Sweden)

    CARLOS E. ARARAT

    2011-01-01

    Full Text Available El óxido de estaño en forma de SnO2 (casiterita ha sido usado como catalizador en diferentes procesos de interés de la industria química, tales como la de deshidrogenación, cracking, isomerización y oxidación de hidrocarburos. En este trabajo se estudió la aplicación de SnO2 como catalizador y como soporte de especies de níquel y estaño, en la alcohólisis del aceite de palma. La obtención del SnO2 se realizó por el método de precipitación y la incorporación de níquel y estaño, al soporte, por el método de impregnación. Se determinó que el SnO2 presentaba una mayor actividad frente a la reacción de alcohólisis en comparación con otros óxidos, tal como el MgO, y que esta actividad era afectada por la adición de níquel y estaño en su superficie. Se utilizó cromatografía de gases CG para el seguimiento de las reacciones, así como la espectroscopia FTIR para realizar el análisis de los productos obtenidos después del proceso. Los catalizadores fueron analizados por DRX para la determinación de las fases cristalinas presentes y del análisis de área superficial, volumen y tamaño de poro, para determinar las propiedades texturales de los catalizadores.

  4. Identificación y clasificación en biotipos de las malezas asociadas con el cultivo de la palma de aceite

    Directory of Open Access Journals (Sweden)

    Carlos Andrés Ariza

    2012-07-01

    Full Text Available En dos plantaciones de palma de aceite, ubicadas en los municipios de Villanueva, Casanare, y Barranca de Upía, Meta, (Colombia, zona del Bajo Upía, se realizó un reconocimiento y clasificación en biotipos de las malezas asociadas con la palma de aceite. Para realizar el trabajo se visitaron las dos fincas, y se procedió a recoger muestras y fotografiar las malezas que se encontraban dentro del cultivo, así como en su contorno. La identificación y descripción se realizó siguiendo la metodología binaria latina expuesta por Linneo y especificada en el Código Internacional de Nomenclatura Botánica, reportada para las especies reconocidas, mediante los servicios del herbario de la Universidad Pedagógica y Tecnológica de Colombia, y referencias de autores como Doll et al. (1972, Lemus y Lemus (2004, Rentería et al. (2006, Blair y Madrigal (2005, Fuentes et al. (1998, Kress et al. (2004, Becerra y Chaparro (1999 y Genty (1993. Para la agrupación de las malezas en biotipos (lianas, herbáceas, arbustos y árboles se tuvieron en cuenta sus características morfológicas. Se encontraron en  total 195 especies de malezas asociadas con el cultivo de la palma de aceite, 145 dicotiledóneas y 50 monocotiledóneas, pertenecientes a 43 familias.

  5. Influencia de los parámetros Rancimat sobre la determinación del índice de estabilidad oxidativa del aceite de Sesamum indicum L.

    Directory of Open Access Journals (Sweden)

    Eudes Villanueva López

    2013-01-01

    Full Text Available El objetivo de esta investigación fue determinar el índice de estabilidad oxidativa (OSI en aceite virgen de semillas de Sesamum Indicum L. (Sésamo, previamente extraído por presión en frio, clarificado por centrifugación y almacenado bajo atmosfera de nitrógeno y en refrigeración. El OSI se determinó mediante la prueba acelerada de Rancimat, para ello se utilizaron 3,0 ± 0,1 g de muestra, parámetros de temperatura (110, 130 y 150°C y flujo de aire (15, 20 y 25 L/h. Al aplicar el test de Rancimat, se pudo comprobar mediante el ANOVA (p < 0,05 que la influencia de la temperatura en el OSI fue altamente significativa, mientras que el flujo de aire solo fue significativo. Mediante el método de extrapolación, se calcularon los valores de OSI a temperaturas usuales de almacenamiento de aceites (25°C obteniéndose tiempos de estabilidad de 214, 242 y 222 días; además la energía de activación de la reacción de oxidación del aceite de sésamo a distintos flujos de aire, es de 97,28, 98,79 y 96,86 kJ/mol para 15, 20 y 25 L/h respectivamente.

  6. Microencapsulación mediante secado por aspersión de aceite de mora (Rubus glaucus extraido con CO2 supercrítico

    Directory of Open Access Journals (Sweden)

    Paola Milena Figueroa Martínez

    2016-11-01

    Full Text Available El aceite de mora es un ingrediente natural con potencial en la industria cosmética y alimentaria, a su vez puede experimentar degradación oxidativa en condiciones ambientales. Por ello, se extrajo aceite a partir de semillas de mora empleando fluidos supercríticos y, posteriormente, se microencapsuló mediante secado por aspersión y se  evaluó la influencia de diferentes condiciones de operación en el rendimiento, y la eficiencia del proceso. Se emplearon como materiales encapsulantes: masterdry, goma arábiga y maltodextrina. Se estudió el tamaño y morfología de las microcápsulas. Se determinó que en el proceso de microencapsulación la temperatura de entrada fue la única variable estadísticamente significativa que afectó el rendimiento y la eficiencia, cuando se usaron como encapsulantes masterdry y goma arábiga. El caudal de alimentación fue estadísticamente significativo sólo para el rendimiento del proceso y lo influenció negativamente cuando se usó maltodextrina. La goma arábiga resultó ser el mejor encapsulante entre los tres estudiados. Se obtuvieron microcápsulas con tamaños entre 8,2 y 14 μm, con superficie continua en las paredes y ausencia de poros. Se comprobó que la microencapsulación con los tres encapsulantes permitió proteger el aceite y conservar mayoritariamente su perfil de ácidos grasos.

  7. Estudio in vitro de la viabilidad de células Caco-2 en presencia de componentes del aceite esencial de Allium spp

    Directory of Open Access Journals (Sweden)

    M. Llana Ruiz-Cabello

    2013-01-01

    Full Text Available El aceite esencial de los componentes del género Allium, principalmente ajo y cebolla, presenta propiedades antioxidantes y antibacterianas debidas a la presencia de compuestos azufrados en su composición. La industria alimentaria ha comenzado a desarrollar nuevos sistemas de envasado activo a partir de polímeros seleccionados, a los que se incorporan aceites esenciales que, por sus propiedades, contribuyen a aumentar la vida útil de los alimentos perecederos. En este sentido, se hace necesario evaluar la seguridad asociada al uso de estas sustancias en envases alimentarios que van a estar en contacto con el consumidor a través del alimento. El objetivo del presente estudio fue determinar la citotoxicidad producida por dipropil sulfuro y dipropil disulfuro, dos de los componentes del aceite esencial de ajo y cebolla, en la línea celular Caco-2, células humanas procedentes de carcinoma de colon. Los biomarcadores ensayados fueron el contenido total de proteínas, la captación de rojo neutro y la reducción de la sal de tetrazolio (3-(4,5-dimetiltiazol-2-il-5-(3-carboximetoxifenil-2-(4sulfofenil-2H-tetrazolio. Las células fueron expuestas durante 2, 4 y 8 h a concentraciones comprendidas entre 0 y 200 µM. Los resultados no mostraron diferencias significativas frente al control para ninguno de los tres marcadores, lo que demuestra que bajo las condiciones de los ensayos ambos compuestos azufrados no son citotóxicos para esta línea celular gastrointestinal y podrían ser útiles en la industria alimentaria para desarrollar envases activos.

  8. Evaluación de la actividad repelente de aceites esenciales de plantas Piperáceas del departamento de Chocó, Colombia

    Directory of Open Access Journals (Sweden)

    BE Jaramillo-Colorado

    2015-01-01

    Full Text Available El objetivo de este trabajo fu e determinar la composición química volátil del aceite esencial de varias especies de Piper áceas ( Piper dilatatum, Piper aduncum, Piper divaricatum, Piper sp, Piper sanctifelicis y la actividad repelente de ellos contra el gorgojo de granos almacenados Tribolium castaneum Herbst. Los aceites esenciales se obtuvieron por hidrodestilación, la separación e identificación de los component es volátiles se realizó por cromatografía de gases acoplada a espectrometría de masas y par a la evaluación de la activ idad repelente se empleó el método de áre a de preferencia. Los compuestos m ayoritarios encontrados en Piper dilatatum fueron el apiol 89,0% y trans -cariofileno (3,5%; en Piper divaricatum, eugenol (37,5% y metil eugenol (36,3%; Piper sp,  - gurjuneno (o guaieno (24,9% y elemol (14,2%; Piper sanctifelicis,  -3-careno (35,3% y limoneno (27,1%; Piper aduncum , dilapiol (48,2% y 1,8 cineol (11,4%. Los porcentajes de repelencia de los aceites esenciales a una concentración de 1 μ L/cm 2 , a un tiempo de exposición de 2 horas frente al T. castaneum fueron: Piper aduncum (99%, Piper sp (96%, Piper dilatatum (82%, Piper divaricatum (76%, Piper santifelicis (33%.

  9. Transesterificación del aceite de palma con metanol por medio de una catálisis heterogénea empleando un catalizador ácido

    Directory of Open Access Journals (Sweden)

    Lina Marcela Riveros Santamaría

    2006-11-01

    Full Text Available La transesterificación del aceite de palma crudo con metanol se llevó a cabo en un reactor Batch bajo un rango de temperatura de 129-140°C y una presión manométrica de 6.4-9.4 bares, en presencia de Oxido de Zinc. Los factores estudiados fueron la cantidad de catalizador y la relación molar aceite:metanol alimentadas a la reacción La producción de esteres metílicos se incrementó al aumentar la cantidad de Óxido de Zinc, mientras que la relación aceite:metanol óptima fue de 1:30. El mayor rendimiento de esteres alcanzado fue de 38.75%. Los valores de Densidad, Viscosidad y Punto de nube determinados más cercanos a los estándar para Biodiesel fueron 0.871 gr/ml, 3.77 cSt y 12°C respectivamente./ Transesterification of crude palm oil with methanol was carried out using a Batch reactor under a range of temperature from 129 to 140°C, and a manometric pressure of 6.4-9.4 bars, in the presence of Zinc Oxide. The studied factors were the amount of catalyst and the molar relation of oil:methanol in the reaction. The production of methyl esters was increased with the amount of Zinc Oxide, while the optimal molar relation oil:methanol was 1:30. The greatest yield of methyl esters achieved was 38.75%. The closest Density, Viscosity and Cloud point values to Biodiesel standard values were 0.871 gr/ml, 3.77 cSt y 12°C respectively.

  10. The effect of charge motion on mixture preparation and ignition for spark ignition engines with homogeneous combustion processes. A report of the Institute forInternal Combustion Engines and Automotive Engineering, TU Vienna; Einfluss der Ladungsbewegung auf Gemischbildung und Entzuendung bei Otto-Motoren mit homogenen Brennverfahren. Bericht des Instituts fuer Verbrennungskraftmaschinen und Kraftfahrzeugbau der Technischen Universitaet Wien (IVK)

    Energy Technology Data Exchange (ETDEWEB)

    Geringer, B. (ed.); Lauer, T.

    2007-07-01

    The wish to go easy on global oil-resources and the compatibility of environment and traffic are subject of public interest. Therefore, measures must be taken for gasoline engines regarding fuel consumption and CO{sub 2}-emissions. The dethrottling of the intake system by means of residual gas recirculation is a well known measure to reduce the fuel consumption. However, high residual gas concentrations cause a delayed combustion and increased cyclic variations. The specific initiation of charge motion and turbulence in the combustion chamber accelerates and stabilizes the combustion and thus compensates the effects caused by high residual gas concentrations. Because of these complex interactions it is desirable to have the possibility to evaluate the residual gas tolerance of the combustion process at low-load engine operation already during the concept phase. Therefore, it was the aim of this study to develop a method based on numerical simulation that allows a prediction of the combustion stability margin for SI engines with homogeneous combustion for arbitrary in-cylinder flow. Investigations that were carried out with the CFD-method confirmed the acceleration of the combustion with increased turbulence. Further the supporting effect of charge motion on mixture preparation could be pointed out. However, combustion processes with highest swirl-numbers caused a vertical mixture stratification in the combustion chamber with lean mixture at the spark plug resulting in a lower residual gas tolerance. A threshold for a stable combustion could be determined by analyzing the properties of the cylinder charge by means of the flame theory method what further enabled the prediction of the residual gas tolerance of the combustion process and the potential to reduce the fuel consumption. A good correlation between the predicted values of the external residual gas recirculation rate and measurements at the engine test bench could be found. Although improvements of the

  11. Influence of Environmentally Friendly and High-Efficiency Composite Additives on Pulverized Coal Combustion in Cement Industry

    OpenAIRE

    2016-01-01

    4 kinds of chemical reagents and 3 kinds of industrial wastes were selected as burning additives for 2 kinds of coals in cement industry. The work focused on the replacement of partial chemical reagents by industrial wastes, which not only reduced the cost and took full advantage of industrial wastes, but also guaranteed the high combustion efficiency and removed the NOX and SO2 simultaneously. The experiments were carried out in DTF. The combustion residues were analyzed by SEM and XRD. The ...

  12. Twenty-second symposium (international) on combustion

    Energy Technology Data Exchange (ETDEWEB)

    1989-01-01

    The following research areas were discussed at the symposium: coal combustion: carbon burnout, pyrolysis, furnaces, laboratory-scale combustion, and fluidized bed combustion; combustion-generated particulates: soot inception, growth, and soot formation in diffusion flames; engine combustion; turbulent combustion: flames in vortices, fractals and cellular automations, nonpremixed flames, premixed flames, premixed flame structure, and lifted flames; reaction kinetics: hydrocarbon oxidation, free radical chemistry, unsaturated species, aromatics, and nitrogen compounds/pollutant formation; combustion generated NO/sub x/ and SO/sub x/; fires: flame spread, radiation, characterization, and unsteady flames; Laminar flames: structure, opposed-flow combustion, shape, propagation/extinction, and inhibition, oscillations, microgravity; ignition; detonations; dusts; propellants; diagnostics; combustion of drops, sprays, and dispersions, and slurries. Individual projects are processed separately for the data bases. (CBS)

  13. Combustion iron distribution and deposition

    Science.gov (United States)

    Luo, Chao; Mahowald, N.; Bond, T.; Chuang, P. Y.; Artaxo, P.; Siefert, R.; Chen, Y.; Schauer, J.

    2008-03-01

    Iron is hypothesized to be an important micronutrient for ocean biota, thus modulating carbon dioxide uptake by the ocean biological pump. Studies have assumed that atmospheric deposition of iron to the open ocean is predominantly from mineral aerosols. For the first time we model the source, transport, and deposition of iron from combustion sources. Iron is produced in small quantities during fossil fuel burning, incinerator use, and biomass burning. The sources of combustion iron are concentrated in the industrialized regions and biomass burning regions, largely in the tropics. Model results suggest that combustion iron can represent up to 50% of the total iron deposited, but over open ocean regions it is usually less than 5% of the total iron, with the highest values (ocean biogeochemistry the bioavailability of the iron is important, and this is often estimated by the fraction which is soluble (Fe(II)). Previous studies have argued that atmospheric processing of the relatively insoluble Fe(III) occurs to make it more soluble (Fe(II)). Modeled estimates of soluble iron amounts based solely on atmospheric processing as simulated here cannot match the variability in daily averaged in situ concentration measurements in Korea, which is located close to both combustion and dust sources. The best match to the observations is that there are substantial direct emissions of soluble iron from combustion processes. If we assume observed soluble Fe/black carbon ratios in Korea are representative of the whole globe, we obtain the result that deposition of soluble iron from combustion contributes 20-100% of the soluble iron deposition over many ocean regions. This implies that more work should be done refining the emissions and deposition of combustion sources of soluble iron globally.

  14. Combustion Byproducts Recycling Consortium

    Energy Technology Data Exchange (ETDEWEB)

    Paul Ziemkiewicz; Tamara Vandivort; Debra Pflughoeft-Hassett; Y. Paul Chugh; James Hower

    2008-08-31

    The Combustion Byproducts Recycling Consortium (CBRC) program was developed as a focused program to remove and/or minimize the barriers for effective management of over 123 million tons of coal combustion byproducts (CCBs) annually generated in the USA. At the time of launching the CBRC in 1998, about 25% of CCBs were beneficially utilized while the remaining was disposed in on-site or off-site landfills. During the ten (10) year tenure of CBRC (1998-2008), after a critical review, 52 projects were funded nationwide. By region, the East, Midwest, and West had 21, 18, and 13 projects funded, respectively. Almost all projects were cooperative projects involving industry, government, and academia. The CBRC projects, to a large extent, successfully addressed the problems of large-scale utilization of CCBs. A few projects, such as the two Eastern Region projects that addressed the use of fly ash in foundry applications, might be thought of as a somewhat smaller application in comparison to construction and agricultural uses, but as a novel niche use, they set the stage to draw interest that fly ash substitution for Portland cement might not attract. With consideration of the large increase in flue gas desulfurization (FGD) gypsum in response to EPA regulations, agricultural uses of FGD gypsum hold promise for large-scale uses of a product currently directed to the (currently stagnant) home construction market. Outstanding achievements of the program are: (1) The CBRC successfully enhanced professional expertise in the area of CCBs throughout the nation. The enhanced capacity continues to provide technology and information transfer expertise to industry and regulatory agencies. (2) Several technologies were developed that can be used immediately. These include: (a) Use of CCBs for road base and sub-base applications; (b) full-depth, in situ stabilization of gravel roads or highway/pavement construction recycled materials; and (c) fired bricks containing up to 30%-40% F

  15. Estudio de la composición en ácidos grasos del aceite de las semillas en algunas plantas silvestres españolas

    Directory of Open Access Journals (Sweden)

    Vioque, J.

    1994-06-01

    Full Text Available The fatty acid composition of 34 species of plants from a variety of families that grow wild in the Iberian Peninsula was analysed. The aim to the survey was to indentify oils that contain a mix of fatty acids that from a qualitative or quantitative point of view have a commercial value. Because of the diverse taxonomic origin of the samples, the oil content between species was very variable, fluctuating between an average value of 3.4% in the Caryophyllaceae and 31.1% in Euphorbiaceae. Like the oil content, the fatty acid composition was quite variable, but, in general, the main fatty acids were palmitic, oleic, linoleic and linolenic acid, while in the Brassicaceae and in the Apiaceae erucic acid and petroselinic acid were the principal fatty acids respectively.

    Se ha estudiado la composición en ácidos grasos del aceite de las semillas en 34 plantas silvestres de la Península Ibérica. Se pretende la obtención de aceites con una composición en ácidos grasos que cualitativa o cuantitativamente puedan resultar de interés desde un punto de vista comercial. Debido al origen taxonómico tan diverso de las muestras, el contenido en aceite resulta muy variable, oscilando entre un valor medio del 3.4% en las Caryophyllaceae y el 31.1% de media en las Euphorbiaceae. Como el contenido en aceite, la composición en ácidos grasos es también bastante Variable, pero en general los principales ácidos grasos son palmítico, oleico, linoleico y linolénico, mientras que en las Brassicaceae domina el ácido erúcico y en las Apiaceae el ácido petroselínico.

  16. El mejoramiento de procesos y su aplicación bajo norma ISO 9004: caso compañía de aceites

    Directory of Open Access Journals (Sweden)

    GIOVANNI PEREZ

    2006-01-01

    Full Text Available Este artículo se centra en la elaboración de una propuesta de mejoramiento para el problema que presenta el proceso de Despacho de Pedidos de la línea de producción de la marca MOTOR PLUS en una empresa dedicada al envase de aceite para vehículos. Para esto se utilizó la teoría sobre mejoramiento de procesos de Harrington y la norma NTC ISO 9001:2000.

  17. Separación de metabolitos de los aceites esenciales de eucalipto y cidrón por destilación molecular

    OpenAIRE

    Cerón Salazar, Ivonne Ximena

    2009-01-01

    En los procesos para la producción y purificación de productos térmicamente inestables, el diseño juega un papel importante ya que determina costos y calidad del producto obtenido. Tres diferentes procesos fueron estudiados para la concentración y separación de metabolitos secundarios a partir de aceites esenciales: Extracción con solventes (SDE), extracción con fluidos supercríticos (SFE) utilizando CO2 y destilación molecular (MD). Los procesos fueron simulados usando el software ASPEN P...

  18. CAMBIOS MORFOLÓGICOS Y FISIOLÓGICOS INDUCIDOS EN Rhizopus stolonifer (Ehrenb.:Fr.) Vuill. POR EFECTO DEL QUITOSANO, OLIGOQUITOSANO Y ACEITES ESENCIALES

    OpenAIRE

    Alfaro Gutiérrez, Ivonne Carolina

    2015-01-01

    La demanda agrícola actual necesita de fungicidas eficientes que contrarresten las enfermedades postcosecha sin ocasionar problemas de contaminación, afectaciones al ambiente y a la salud humana. Entre algunos compuestos compatibles con el ambiente que se han estudiado se encuentran el quitosano, oligoquitosano y los aceites esenciales los cuales se conoce que poseen efecto antifúngico, sin embargo; es poco el conocimiento sobre el modo de acción de estos compuestos en las células fúngicas de...

  19. Efecto Antimicrobiano del Aceite Esencial del tomillo (Thymus vulgaris) sobre la contaminación de Listeria monocytogenes en queso Ricotta

    OpenAIRE

    Morales Castro, Andrés Felipe

    2015-01-01

    Resumen: se evaluó el uso del Aceite Esencial (AE) del tomillo como un aditivo alimentario, con el objetivo de otorgar efecto antimicrobiano, prolongando la vida de anaquel del queso Ricotta. El efecto biocida es atribuido principalmente a la acción de los componentes bioactivos sobre la membrana celular de algunas bacterias. Por ende se llevó a cabo la extracción del AE de tomillo (Thymus vulgaris) a través del método de arrastre por vapor, alcanzando rendimientos cercanos al 0.6%. La caract...

  20. Dietas bajas en proteína adicionadas con ácido linoleico conjugado o aceites de soya acidulado para cerdos en engorda

    OpenAIRE

    Martínez Aispuro, Manuel

    2012-01-01

    Reducir la concentración de proteína en las dietas de cerdos adicionando aminoácidos sintéticos mantiene la respuesta productiva, pero la carne tiene un mayor contenido de grasa. El uso de distinto aceite en la dieta de cerdos puede modificar este aspecto; además, de cambiar el contenido de ácidos grasos en la carne por aumento en el consumo de ácidos grasos que no son sintetizados por los cerdos. Se realizaron tres experimentos para evaluar dietas bajas en proteína y dist...

  1. Fraccionamiento del aceite de hígado de tiburón azul (Prionace glauca y su estabilización con antioxidantes

    Directory of Open Access Journals (Sweden)

    Pacheco, M. T. B.

    1994-06-01

    Full Text Available Crude oil was obtained by boiling (75°C /15 min mashed livers of the blue shark (Prionace glauca. The crude oil was dry fractionated and the oxidative stability of both the crude oil and it's fractions (olein and stearin was evaluated using the Rancimat method (80°C; 2.5 g sample; 20L/h air flow. The efficiency of the following antioxidants, Butylated Hydroxy Toluene (BHT, Tertiary Butyl Hydroquinone (TBHQ, Ascorbil Palmitate (PA, ANTRACINE 220 (TBHQ + citric acid. TOCOMIX D (α and γ tocopherols and RENOXAN A (Ascorbil Palmitate + Lecitin + α tocopherol, were tested in various concentrations. The concentration of polyunsaturated fatty acids was 28% in the whole crude oil; 24% in the stearin fraction and 33% in the olein; the oxidative stability was inversely related to the content of polyunsaturated fatty acids. TBHQ was the most efficient antioxidant in crude oil as well as in the fractions. Treatment with the natural antioxidant RENOXAN A was also highly efficient, though less so than TBHQ.

    Hígados triturados de tiburón azul (Prionace glauca fueron sometidos a cocimiento (75°C x 15 min para obtención del aceite crudo. El aceite fue caracterizado y fraccionado por cristalización en seco. La concentración de ácidos grasos poliinsaturados fue del 28% en el aceite crudo, 24% en la estearina y 33% en la oleina. En el aceite y sus fracciones se determinó la estabilidad oxidativa por el método Rancimat (80°C, 2,5g muestra y 20L/h aire. La eficiencia del BHT, TBHQ, Ascorbil palmitato puros y los antioxidantes comerciales formulados Antracine 220, Tocomix D y Renoxan A fue determinada a diversas concentraciones. El antioxidante TBHQ fue el más eficiente entre los sintéticos. Renoxan A (antioxidante natural mostró alta eficicencia, pero menor que el TBHQ.

  2. RELACIÓN ENTRE VARIABLES CLIMÁTICAS CON LA MORFOLOGÍA Y CONTENIDO DE ACEITE DE SEMILLAS DE HIGUERILLA (Ricinus communis L.) DE CHIAPAS

    OpenAIRE

    María Antonieta Goytia-Jiménez; Carlos Horacio Gallegos-Goytia; Carlos Alberto Núñez-Colín

    2011-01-01

    Ciento cincuenta y un accesiones de higuerilla (Ricinus communis L.), colectadas en el estado de Chiapas, México, fueron caracterizadas por contenido de aceite, forma, tamaño y peso de la semilla, con el objetivo de generar información que pueda servir de base en un programa de mejoramiento para esta especie, que podría ser una opción rentable para la producción de biodiesel y bioturbosina. De acuerdo con su distribución, se establecieron las cuatro siguientes zonas climáticas: Región 1) clim...

  3. Optimización del control del sistema de aceite térmico en centrales solares termoeléctricas

    OpenAIRE

    Álvarez Barcia, Lourdes

    2015-01-01

    Esta tesis está basada en las centrales termosolares de colectores cilindroparabólicos ya que esta tecnología es la que está mayoritariamente implantada en todo el mundo frente a otras como la Fresnel o la de Torre. Concretamente, el trabajo se dirige hacia una central termosolar que utiliza aceite como fluido caloportador y almacenamiento de energía térmica en sales fundidas, aunque los resultados podrían ser fácilmente extrapolables a centrales con otro tipo de fluido térmico como agua,...

  4. Tratamiento enzimático en la extracción de aceite de pipa de uva, Vitis vinifera, por prensado en frío

    Directory of Open Access Journals (Sweden)

    Zúñiga, M. E.

    2003-03-01

    Full Text Available The effect of enzyme incorporation is analyzed over the yield of grapeseed oil extraction by cold pressing. By this type of process the objective is to preserve grapeseed active compounds and to diminish the environmental impact in comparison to oil extraction conventional methods which use higher temperatures. The enzymatic hydrolysis takes place with a commercial enzyme previous to pressing stage. Its effectiveness is compared to a control without the biocatalyst. An oil extraction yield of 72 % d.b. is obtained with an enzymatic pre-treatment for 4 hours at 50 ºC, and 60 % of moisture, increasing in 26 % the control result. It is concluded that the incorporation of an enzymatic processing would be a feasible alternative to extract grapeseed oil under softener process conditions improving the yield of extraction in comparison to the same type of methodology without an enzyme.Se analiza el efecto de la incorporación de enzimas sobre el rendimiento de extracción de aceite por prensado en frío. Con el prensado en frío se busca preservar los compuestos activos de la pipa de uva y minimizar el impacto medioambiental en comparación con los métodos convencionales de extracción de aceite que utilizan altas temperaturas. El tratamiento enzimático se efectúa previo al prensado con una enzima comercial y su efectividad se compara con un control sin catalizador. Un rendimiento de extracción de aceite del 72 % b.s. se logra con un pre-tratamiento enzimático durante 4 horas a 50 ºC, y 60 % de humedad, superando en un 26 % al control. Se concluye que la incorporación de un tratamiento enzimático sería una alternativa factible para extraer el aceite de pipa de uva bajo condiciones suaves de proceso mejorando el rendimiento de extracción en comparación con el mismo tipo de proceso sin enzima.

  5. RESPUESTA PRODUCTIVA Y PERFIL LIPÍDICO DE LA LECHE DE CABRAS ALIMENTADAS EN CONFINAMIENTO ADICIONANDO ACEITE DE SOYA EN LA DIETA

    OpenAIRE

    MEJÍA URIBE, LUIS ALBERTO

    2016-01-01

    La leche de cabra y sus productos (queso, yogurt) son una importante fuente de nutrientes tales como lípidos, proteínas, vitaminas y minerales, que pueden ser considerados como parte de la dieta de los humanos, sobre todo para personas intolerantes a ciertos componentes (lactosa) de la leche de vaca. El objetivo de la presente investigación fue evaluar el efecto de la adición de aceite de soya (6% BS) sobre la producción, composición y perfil de ácidos grasos (AG) de la leche de cabras Saanen...

  6. Determinación de la corrosión y estabilidad de mezclas de corrientes de refinería y aceites vegetales en procesos de hidrotratamiento

    OpenAIRE

    Cantero Plaza, Noemí

    2011-01-01

    Proyecto Fin de Carrera leído en la Universidad Rey Juan Carlos en el curso académico 2010/2011. Directores del Proyecto: José Aguado Alonso y L. Fernando Bautista Santa Cruz Colaborador: Antonio Alcázar Martínez El co-procesamiento de aceites vegetales junto con fracciones de petróleo en unidades de hidrotratamiento constituye una alternativa atractiva para la obtención de biocarburantes con el objetivo de alcanzar el cumplimiento de las Directivas Europeas 2009/28/CE y 2009/30/C...

  7. Efecto del consumo de nueces, semillas y aceites sobre marcadores bioquímicos y el peso corporal; revisión sistemática

    OpenAIRE

    C. De Lira-García; M. Bacardí-Gascón; Jiménez-Cruz, A.

    2012-01-01

    Objetivo: Determinar la efectividad del consumo a largo plazo de nueces, semillas y aceites (NSA) sobre el peso corporal, glucosa y nivel de lípidos en población adulta. Métodos: Se buscaron los artículos en inglés publicados en Pubmed y Ebsco hasta mayo del 2011. Se incluyeron los ensayos clínicos aleatorios de 24 semanas o más de intervención. Los términos de búsqueda fueron diabetes mellitus , Nuts , Mediterranean Diet , Seeds , Oils , Canola oil , Olive oil , Walnut , Almond , P...

  8. Análisis de usabilidad de cooperativas del sector de la fruta y aceite en el área de Lleida

    OpenAIRE

    Toni Granollers Saltiveri; Eduard Cristóbal Fransi; Yolanda Montegut Salla

    2013-01-01

    El presente artículo muestra el proceso, la investigación y los resultados de un análisis de usabilidad en los sitios web de las cooperativas agroalimentarias del sector frutícola y oleícola de la provincia de Lleida. El estudio nace de la necesidad de analizar el estado de la presencia y uso de Internet en general y de la web en particular para una industria vital para la citada provincia. Ambos sectores, aceite y fruta dulce, son de vital importancia para la economía de esta zona.La evaluac...

  9. Análisis de usabilidad de cooperativas del sector de la fruta y aceite en el área de Lleida

    OpenAIRE

    Toni Granollers Saltiveri; Eduard Cristóbal Fransi; Yolanda Montegut Salla

    2013-01-01

    El presente artículo muestra el proceso, la investigación y los resultados de un análisis de usabilidad en los sitios web de las cooperativas agroalimentarias del sector frutícola y oleícola de la provincia de Lleida. El estudio nace de la necesidad de analizar el estado de la presencia y uso de Internet en general y de la web en particular para una industria vital para la citada provincia. Ambos sectores, aceite y fruta dulce, son de vital importancia para la economía de esta zona. La ev...

  10. Aplicación de aceites esenciales para el control de Salmonella Typhimurium aislada de casos clínicos en diferentes especies animales

    OpenAIRE

    Solarte Portilla, Ana Lucía

    2016-01-01

    Los animales de abasto constituyen el principal reservorio de bacterias resistentes para el hombre a través del contacto directo y el consumo de alimentos. La creciente inquietud por la seguridad alimentaria “desde la granja a la mesa” ha llevado a la búsqueda de nuevas alternativas para el control de los microorganismos implicados en toxi-infecciones alimentarias, como salmonela. El presente es un ensayo in vitro de la actividad antimicrobiana de diez aceites esenciales frente a 23 cepas de ...

  11. Efecto hipolipemiante del aceite de Sacha Inchi en adultos con hipercolesterolemia e hipertrigliceridemia de 35 - 64 años, Nuevo AA.HH. Nueva Alianza, Chaclacayo, Lima

    OpenAIRE

    Gamarra Camacho, María; Flores Albino, Betzabé; Palacios Morales, Félix

    2015-01-01

    Objetivo: Determinar el efecto hipolipemiante del aceite de Sacha Inchi (Plukenetia volúbilis linneo) administrado en personas con hipercolesterolemia e hipertrigliceridemía de 35 a 64 años en el AA. HH. Nueva Alianza - Chaclacayo. Material y métodos: Estudio de diseño preexperimental, de corte longitudinal prospectivo y de alcance explicativo. El grupo de participantes se conformó de 30 personas, en quienes se determinaron los valores sanguíneos de colesterol total (CT), colesterol (LDL), co...

  12. Composición, caracterización y potencial aterogénico de aceites, grasas y otros derivados producidos o comercializados en Costa Rica

    OpenAIRE

    Monserrat Castro-Bolaños; Carlos H Herrera-Ramírez; Giselle Lutz-Cruz

    2005-01-01

    Las enfermedades cardiovasculares, tan comunes entre los costarricenses, están relacionadas con la ingesta de altas cantidades de lípidos capaces de ejercer una acción perjudicial en las arterias del cuerpo humano. El presente estudio tuvo como objetivo determinar la calidad de las grasas y aceites más consumidos por la población de nuestro país. Se recolectaron y codificaron 15 marcas diferentes de mantequillas o margarinas (A, B, D1 a D11), 7 tipos de mantecas (E1 a E7) y 14 marcas diferent...

  13. Alternativa de purificación de biodiésel obtenido por transesterificación de aceite de palma con metanol supercrítico

    OpenAIRE

    Garay Mayorga, Edgar Asdraldo

    2014-01-01

    En estudios recientes sobre la producción de biodiésel obtenido por transesterificación de aceite de palma con metanol, se han diseñado reactores que trabajan a condiciones supercríticas en ausencia de un catalizador, con resultados de conversiones superiores al 96%. Sin embargo, a la salida del reactor también hay glicerol (coproducto) y metanol (reactivo en exceso). Este proceso se lleva a cabo a condiciones de alta presión y alta temperatura, lo que se traduce en un proceso costoso de alto...

  14. Efecto sobre el color de la carne picada de cerdo, de la inclusión de aceite de tomillo en su dieta

    OpenAIRE

    Haro González, María Pilar de; Sotomayor Sánchez, José Antonio; Jordán Bueso, María Josefa; Jiménez, María C.; Martínez Conesa, Cristina

    2010-01-01

    Póster presentado en el IX Congreso Nacional del Color, Alicante, 29-30 junio, 1-2 julio 2010. La prohibición de los antibióticos como promotores del crecimiento animal, por parte de la U.E., ha alentado el estudio de diferentes compuestos del metabolismo secundario de las plantas, con demostrada capacidad antioxidante y antimicrobiana, como sustitutos de dichos antibióticos. Se ha estudiado el efecto del aceite esencial de dos especies de tomillo (Thymus ssp.), de quimiotipo timol y otro ...

  15. Efecto del aceite esencial de Melissa oficinalis l. “toronjil” y meditación mindfulness en niveles de ansiedad estado y ansiedad

    OpenAIRE

    Soto Vásquez, Marilú Roxana; Universidad Nacional de Trujillo; Alvarado García, Paul Alan Arkin; Rosales Cerquín, Luis Enrique

    2016-01-01

    La presente investigación tuvo como objetivo evaluar el efecto de la aromaterapia en base al aceite esencial de Melissa oficinalis L. y la meditación mindfulness en los niveles de ansiedad de voluntarios humanos. Para este fin se realizó un estudio experimental con mediciones pre test y post test, en una muestra de 52 participantes, divididos aleatoriamente en  un grupo control, a cuyos integrantes se les mantuvo en lista de espera, y tres grupos experimentales; siendo el primer grupo tratado...

  16. Caracterización geográfica de los aceites de oliva vírgenes de la denominación de origen protegida ’Les Garrigues’ por su perfil de ácidos grasos

    OpenAIRE

    Motilva Casado, Mª José; Ramo Aparicio, Tomás; Romero Fabregat, Mª Paz

    2001-01-01

    Se ha analizado el perfil de ácidos grasos en 190 muestras de aceite de oliva virgen de la DOP Les Garrigues (Lleida) de tres campañas consecutivas (1995/96, 1996/97 y 1997/98). Se ha encontrado que la mayor variabilidad entre los ácidos grasos es debida a aspectos relacionados con la climatología de la campaña oleícola y con la procedencia de los aceites. El análisis de componentes principales ha permitido obtener dos componentes principales que explican más del 80 % de la variabilidad obser...

  17. Síntesis y caracterización de espumas flexibles de poliuretano obtenidas a partir de aceite de castor maleinizado Flexible polyurethane foam synthesis and characterization obtained from maleinizated castor oil

    OpenAIRE

    Paula Mazo; Luis A. Rios; Diana Estenoz

    2009-01-01

    En este trabajo se realiza la síntesis de espumas flexibles de poliuretano empleando un diseño experimental Taguchi, utilizando aceite de castor con y sin maleinización, se estudia la cinética de la reacción de esterificación del aceite por cuantificación de los grupos ácido (ASTM D4662 - 03) y se evalúan las propiedades mecánicas de las espumas (densidad, resistencia tensil, % elongación, resiliencia y dureza. Norma NTC 2019 Icontec) obtenidas en función de las variables de síntesis (cantida...

  18. Aproximación proteómica del material IRHO7001 de palma de aceite Elaeis guineensis Jacq en condiciones de déficit hídrico

    OpenAIRE

    Pérez Mora, Walter Hernando

    2012-01-01

    La palma de aceite (Elaeis guineensis Jacq), es uno de los cultivos más importantes en la actualidad debido a su uso en los biocombustibles y en la producción de aceites (FEDEPALMA 2007). En Colombia, uno de los principales países productores, la mayor parte del cultivo se concentra en regiones secas en los cuales pueden presentarse eventos de estrés hídrico en las plantas. En el presente trabajo se hizo una aproximación proteómica al problema del déficit hídrico en el material vegetal IRHO 7...

  19. Evaluación de aceites esenciales de tomillo (thymus vulgaris) y orégano (origanum vulgare) como microbicidas y conservantes en mazorcas tiernas de maíz (zea mays l.)

    OpenAIRE

    Campo Velasco, July Alexandra; Vanega Mahecha, Pedro

    2014-01-01

    Durante el almacenamiento de mazorcas tiernas de maíz intervienen microorganismos que ocasionan pérdidas y deterioran su calidad. Los aceites esenciales presentan bioactividades notables (Henao et al., 2010). Contienen compuestos que poseen actividad microbicida como timol y el carvacrol (Guiza y Rincón, 2007). El objetivo de este estudio es evaluar el efecto microbicida y conservante de los aceites esenciales de tomillo (Thymus vulgaris) y orégano (Origanum vulgare) en mazorcas de maíz tiern...

  20. Explosion limits for combustible gases

    Institute of Scientific and Technical Information of China (English)

    TONG Min-ming; WU Guo-qing; HAO Ji-fei; DAI Xin-lian

    2009-01-01

    Combustible gases in coal mines are composed of methane, hydrogen, some multi-carbon alkane gases and other gases. Based on a numerical calculation, the explosion limits of combustible gases were studied, showing that these limits are related to the concentrations of different components in the mixture. With an increase of C4H10 and C6H14, the Lower ExplosionLimit (LEL) and Upper Explosion-Limit (UEL) of a combustible gas mixture will decrease clearly. For every 0.1% increase in C4H10 and C6H14, the LEL decreases by about 0.19% and the UEL by about 0.3%. The results also prove that, by increasing the amount of H2, the UEL of a combustible gas mixture will increase considerably. If the level of H2 increases by 0.1%, the UEL will increase by about 0.3%. However, H2 has only a small effect on the LEL of the combustible gas mixture. Our study provides a theoretical foundation for judging the explosion risk of an explosive gas mixture in mines.

  1. Turbulent Combustion in SDF Explosions

    Energy Technology Data Exchange (ETDEWEB)

    Kuhl, A L; Bell, J B; Beckner, V E

    2009-11-12

    A heterogeneous continuum model is proposed to describe the dispersion and combustion of an aluminum particle cloud in an explosion. It combines the gas-dynamic conservation laws for the gas phase with a continuum model for the dispersed phase, as formulated by Nigmatulin. Inter-phase mass, momentum and energy exchange are prescribed by phenomenological models. It incorporates a combustion model based on the mass conservation laws for fuel, air and products; source/sink terms are treated in the fast-chemistry limit appropriate for such gasdynamic fields, along with a model for mass transfer from the particle phase to the gas. The model takes into account both the afterburning of the detonation products of the C-4 booster with air, and the combustion of the Al particles with air. The model equations were integrated by high-order Godunov schemes for both the gas and particle phases. Numerical simulations of the explosion fields from 1.5-g Shock-Dispersed-Fuel (SDF) charge in a 6.6 liter calorimeter were used to validate the combustion model. Then the model was applied to 10-kg Al-SDF explosions in a an unconfined height-of-burst explosion. Computed pressure histories are compared with measured waveforms. Differences are caused by physical-chemical kinetic effects of particle combustion which induce ignition delays in the initial reactive blast wave and quenching of reactions at late times. Current simulations give initial insights into such modeling issues.

  2. New Combustion Regimes and Kinetic Studies of Plasma Assisted Combustion

    Science.gov (United States)

    2012-11-01

    Tasks 8 and 9: Kinetic model validation) Today’s Presentation 2. Multispecies diagnostics in a flow reactor with Mid-IR and molecular beam mass...S-Curve Competition between low T RO2 kinetics high T chain branching reactions 0.00 0.02 0.04 0.06 0.08 0.10 0.12 1x10 5 2x10 5 3x10 5 4x10...in Plasma assisted combustion • LTC in turbulent combustion at engine time scales 0-D modeling of DME /O2/He (0.03/0.1/0.896) ignition, P = 72

  3. Combustion synthesis method and products

    Science.gov (United States)

    Holt, J.B.; Kelly, M.

    1993-03-30

    Disclosed is a method of producing dense refractory products, comprising: (a) obtaining a quantity of exoergic material in powder form capable of sustaining a combustion synthesis reaction; (b) removing absorbed water vapor therefrom; (c) cold-pressing said material into a formed body; (d) plasma spraying said formed body with a molten exoergic material to form a coat thereon; and (e) igniting said exoergic coated formed body under an inert gas atmosphere and pressure to produce self-sustained combustion synthesis. Also disclosed are products produced by the method.

  4. Fundamentals of premixed turbulent combustion

    CERN Document Server

    Lipatnikov, Andrei

    2012-01-01

    Lean burning of premixed gases is considered to be a promising combustion technology for future clean and highly efficient gas turbine engines. This book highlights the phenomenology of premixed turbulent flames. The text provides experimental data on the general appearance of premixed turbulent flames, physical mechanisms that could affect flame behavior, and physical and numerical models aimed at predicting the key features of premixed turbulent combustion. The author aims to provide a simple introduction to the field for advanced graduate and postgraduate students. Topics covered include La

  5. Chemical kinetics and combustion modeling

    Energy Technology Data Exchange (ETDEWEB)

    Miller, J.A. [Sandia National Laboratories, Livermore, CA (United States)

    1993-12-01

    The goal of this program is to gain qualitative insight into how pollutants are formed in combustion systems and to develop quantitative mathematical models to predict their formation rates. The approach is an integrated one, combining low-pressure flame experiments, chemical kinetics modeling, theory, and kinetics experiments to gain as clear a picture as possible of the process in question. These efforts are focused on problems involved with the nitrogen chemistry of combustion systems and on the formation of soot and PAH in flames.

  6. Autodesk Combustion 4 fundamentals courseware

    CERN Document Server

    Autodesk,

    2005-01-01

    Whether this is your first experience with Combustion software or you're upgrading to take advantage of the many new features and tools, this guide will serve as your ultimate resource to this all-in-one professional compositing application. Much more than a point-and-click manual, this guide explains the principles behind the software, serving as an overview of the package and associated techniques. Written by certified Autodesk training specialists for motion graphic designers, animators, and visual effects artists, Combustion 4 Fundamentals Courseware provides expert advice for all skill le

  7. Free Energy and Internal Combustion Engine Cycles

    CERN Document Server

    Harris, William D

    2012-01-01

    The performance of one type (Carnot) of Internal Combustion Engine (ICE) cycle is analyzed within the framework of thermodynamic free energies. ICE performance is different from that of an External Combustion Engine (ECE) which is dictated by Carnot's rule.

  8. Scramjet Combustion Stability Behavior Modeling Project

    Data.gov (United States)

    National Aeronautics and Space Administration — A recent breakthrough in combustion stability analysis (UCDS) offers the means to accurately predict the combustion stability of a scramjet. This capability is very...

  9. Scramjet Combustion Stability Behavior Modeling Project

    Data.gov (United States)

    National Aeronautics and Space Administration — A recent breakthrough in combustion stability analysis (UCDS) offers the potential to predict the combustion stability of a scramjet. This capability is very...

  10. Feasibility investigation and combustion enhancement of a new burner functioning with pulverized solid olive waste

    Directory of Open Access Journals (Sweden)

    Bounaouara H., Sautet J.C., Ben Ticha H., Mhimid A.

    2014-01-01

    Full Text Available This article describes an experimental study on solid olive residue (olive cake combustion in form of pulverized jet. This is a contribution to the valorization of olive residue as a source of renewable energy available in the majority of mediterranean countries. A sample of olive cake from Tunisian origin is prepared for the experiment; this sample is crushed, dried and sifted in order to obtain the desired particles form. A new burner made up of a coaxial cylindrical tube is especially designed and fabricated. In order to start the combustion of olive cake and maintain the main flame, two types of pilot flame were used: a central premixed flame of methane/oxygen and an annular diffusion flame of methane. This paper shows the conditions for an efficient olive cake burner operation in free air. The effects of particle size and pilot flame position have been discussed. The olive cake combustion is possible only with particles at a size below 200 μm. Moreover, the combustion maintained by the annular pilot flame ensures better burning conditions than the central pilot flame. Finally, the inserted preheating system has improved the olive cake combustion.

  11. Modelación y optimización del proceso de extracción de aceite esencial de eucalipto (Eucalyptus globulus

    Directory of Open Access Journals (Sweden)

    Jeancarlos Moreno

    2010-01-01

    Full Text Available En el presente trabajo se estudiaron el efecto de la humedad de la hoja de eucalipto y el tiempo de extracción sobre el rendimiento de aceite esencial y el costo de producción. Se tuvieron en cuenta parámetros como la temperatura de vapor, la presión de extracción, la porosidad de lecho, flujo de vapor y temperatura de condensación. Fue utilizado un Diseño Compuesto Central Rotacional para evaluar las zonas óptimas de extracción y el costo que ocasionaría, buscando en todo momento aumentar los rendimientos y disminuir los gastos. Según este diseño, la extracción con menores costos de producción (0.57 Nuevos Soles por mL de aceite esencial se alcanza cuando las hojas tienen una humedad entre 25 y 30% y se extraen con tiempos entre 98 y 126 min.

  12. Caracterización fisicoquímica y comportamiento térmico del aceite de “almendra” de guanábana (Annona muricata, L

    Directory of Open Access Journals (Sweden)

    Durán-de-Bazúa, M. C.

    2010-03-01

    Full Text Available In this work some physicochemical properties and the thermal behavior and stability of sour sop or guanabana (Annona muricata seed “almond” oil were studied by means of chemical, DSC and TG analysis. The results showed that the almond has 2.5% ash, 17.9% crude fiber, 15.7% protein, 26.0% de carbohydrates and 37.7% oil (dry base. The composition of almond oil showed 68.5% unsaturated fatty acids, mainly oleic and linoleic, and some palmitoleic acids, and 31.5% saturated, principally palmitic and stearic fatty acids; refraction index was 1.468 and saponification and iodine value were 168.2 and 87.0, respectively. DSC thermal analysis showed that oil crystallization initiates at -4.5 °C and ends at -79.0 °C with a crystallization enthalpy of 48.2 J/g; the oil melts in a temperature range from -42.4 to +16.9 °C, with a maximum peak at -15 °C and a fusion enthalpy of 80.5 J/g. The oil remained liquid at refrigeration temperatures with minimal SFC and free of crystals at temperatures over 10 °C. TG analysis showed that the thermal decomposition of the oil in a N2 atmosphere starts at 380 °C and ends at 442 °C, with a maximum decomposition rate at 412 °C. Under oxidizing conditions its decomposition begins at 206 °C and concludes at 567 °C. In accordance with this study, sour sop almond seed contains large amounts of an oil that possesses similar characteristics to those of salad and cooking oils.En esta investigación se estudiaron las propiedades físicoquímicas y el comportamiento térmico, mediante calorimetría diferencial de barrido y termogravimetría, del aceite extraído de las “almendras” de las semillas de guanábana (Annona muricata, L. Los resultados mostraron que las almendras de las semillas de guanábana contienen 2.5% de cenizas, 17.9% de fibra cruda, 15.7% de proteínas, 26.0% de carbohidratos y 37.7% de aceite (base seca. El aceite de las almendras de guanábana mostró una composición con predominio de

  13. Composición esterólica de la fracción insaponificable del aceite de aguacate de distintas variedades

    Directory of Open Access Journals (Sweden)

    Martínez Nieto, L.

    1994-12-01

    Full Text Available The study of the sterolic composition of the unsaponifiable fraction of oil obtained from several varieties of avocados (Bacon, Fuerte, Hass, and Reed there is not any difference among several areas, sizes and pick up dates for the same variety, but there are differences that depend on the analysed variety, therefore it is possible to concluir that an itemized analysis of the sterolic composition of the oil may be an avocado variety indicator.

    El estudio de la composición esterólica de la fracción insaponificable de aceite obtenido de distintas variedades de aguacates (Bacon, Fuerte, Hass y Reed pone de manifiesto que no existen diferencias para una misma variedad incluso para distintas zonas, calibres y fechas de corte, pero si existen diferencias que dependen de la variedad analizada, pudiéndose concluir que un análisis detallado de la composición esterólica puede ser indicativo de la variedad de aguacate de que procede un aceite.

  14. Efecto fungistático de extractos y aceites esenciales de Lippia origanoides HBK y Thymus vulgaris L. como alternativas de manejo de Botrytis cinerea en fresa

    Directory of Open Access Journals (Sweden)

    Luis Alejandro Taborda Andrade

    2015-01-01

    Full Text Available El moho gris de la fresa causado por Botrytis cinerea es una enfermedad que produce importantes pérdidas poscosecha. En el estudio se evaluó el efecto fungistático de extractos y aceites esenciales de Lippia origanoides HBK y Thymus vulgaris L. en concentraciones de 128, 256 y 500 mg/lt sobre B. cinerea in vitro e in vivo. In vitro se determinó el porcentaje de inhibición del crecimiento micelial del hongo. En estas condiciones se observó que el aceite esencial (AE de L. origanoides presentó el porcentaje de control más alto (66.2% sobre B. cinerea. In vivo, se observó que en bananos inoculados con B. cinerea después de 120 los AE controlaron eficientemente la incidencia de daño causado por el patógeno estudiado y no se encontraron diferencias significativas con el control químico utilizando el fungicida Benomil

  15. CONSTRUCCIÓN DE UN REACTOR DISCONTINUO PARA LA OBTENCIÓN DE BIODIESEL A PARTIR DEL ACEITE DE Ricinus communis

    Directory of Open Access Journals (Sweden)

    Yolimar Fernández

    2014-01-01

    Full Text Available Se construyó un reactor discontinuo para obtener biodiesel a partir de 5 litros de extracto obtenido de la semilla de Ricinus communis. El reactor es de acero inoxidable, con longitud de 29 cm; diámetro interno de 15,24 cm y fondo cónico de 20cm de largo, espesor de la pared de 0,2cm, resistencia tubular de 1000 W y motor de 110 volt. Se extrajo y se comparó con las normas respectivas las propiedades físicas y químicas del aceite crudo. Se realizaron pruebas preliminares de transesterificación del aceite catalizadas con NaOH para constatar la viabilidad de la reacción y definir las condiciones operacionales. El biodiesel obtenido fue caracterizado y comparado con referencias presentes en la literatura. Los resultaron mostraron que es posible obtener el biocombustible en el reactor discontinuo con un grado de conversión 88%; confirmando su aplicación en reacciones de transesterificación en medio básico.

  16. Application of the first combustion model to spray combustion

    NARCIS (Netherlands)

    Jager, de B.; Kok, J.B.W.

    2004-01-01

    Liquid fuel is of interest to apply to gas turbines. The large advantage is that liquids are easily storable as compared to gaseous fuels. Disadvantage is that liquid fuel has to be sprayed, vaporized and mixed with air. Combustion occurs at some stage of mixing and ignition. Depending on the effici

  17. High Frequency Combustion Instabilities of LOx/CH4 Spray Flames in Rocket Engine Combustion Chambers

    NARCIS (Netherlands)

    Sliphorst, M.

    2011-01-01

    Ever since the early stages of space transportation in the 1940’s, and the related liquid propellant rocket engine development, combustion instability has been a major issue. High frequency combustion instability (HFCI) is the interaction between combustion and the acoustic field in the combustion c

  18. Simulation study on combustion of biomass

    Science.gov (United States)

    Zhao, M. L.; Liu, X.; Cheng, J. W.; Liu, Y.; Jin, Y. A.

    2017-01-01

    Biomass combustion is the most common energy conversion technology, offering the advantages of low cost, low risk and high efficiency. In this paper, the transformation and transfer of biomass in the process of combustion are discussed in detail. The process of furnace combustion and gas phase formation was analyzed by numerical simulation. The experimental results not only help to optimize boiler operation and realize the efficient combustion of biomass, but also provide theoretical basis for the improvement of burner technology.

  19. Combustion Chemistry Diagnostics for Cleaner Processes.

    Science.gov (United States)

    Kohse-Höinghaus, Katharina

    2016-09-12

    Climate change, environmental problems, urban pollution, and the dependence on fossil fuels demand cleaner, renewable energy strategies. However, they also ask for urgent advances in combustion science to reduce emissions. For alternative fuels and new combustion regimes, crucial information about the chemical reactions from fuel to exhaust remains lacking. Understanding such relations between combustion process, fuel, and emissions needs reliable experimental data from a wide range of conditions to provide a firm basis for predictive modeling of practical combustion processes.

  20. Actividad antifúngica del quitosano y aceites esenciales sobre Rhizopus stolonifer (Ehrenb.:Fr. Vuill., agente causal de la pudrición blanda del tomate

    Directory of Open Access Journals (Sweden)

    Alejandra María Alvarado Hernández

    2012-06-01

    Full Text Available Título en ingles: Antifungal activity of chitosan and essential oils on Rhizopus stolonifer (Ehrenb.:Fr. Vuill causal agent of soft rot of tomato ResumenRhizopus stolonifer es el agente causal de la pudrición blanda, enfermedad poscosecha que ocasiona pérdidas económicas importantes. Se han empleado fungicidas sintéticos como el dicloran para controlar a este microorganismo, sin embargo, se ha demostrado que los fungicidas representan un riesgo para el ambiente y la salud humana. Actualmente se buscan alternativas naturales para el control de las pudriciones poscosecha. Se evaluó in vitro e in situ el efecto antifúngico del quitosano y de los aceites esenciales de canela (Cinnamomum zeylanicum, clavo (Syzygium aromaticum y tomillo (Thymus vulgaris y dicloran sobre Rhizopus stolonifer. Los tratamientos más efectivos para inhibir in vitro a Rhizopus stolonifer fueron obtenidos con quitosano a 10 mg mL-1, con los tres aceites esenciales probados a la concentración de  0,3 mg mL-1, las mezclas de quitosano a 10 mg mL-1 con los aceites a 0,3 mg mL-1 y el dicloran a 1 mg mL-1. Los experimentos in situ mostraron que el tratamiento individual con quitosano fue el mejor para reducir el porcentaje de infección de los frutos de tomate (Lycopersicon esculentum inoculados con Rhizopus stolonifer y que la mezcla de quitosano con aceites esenciales no mejora la actividad antifúngica. El quitosano y el dicloran fueron los mejores tratamientos para reducir la pérdida de peso de los frutos. Los tratamientos individuales con quitosano representan una alternativa natural para controlar la pudrición blanda en frutos de tomate. Palabras clave: quitosano; aceites esenciales; Rhizopus stolonifer; podredumbre blanda. AbstractRhizopus stolonifer is the causal agent of soft rot, postharvest disease that causes important economic losses. Synthetic fungicides such as dichloran have been used to control this microorganism; however, it has been shown that