Sample records for LIGNINE (lignin)
from WorldWideScience.org

Sample records 1 - 10 shown.



1

Valorisation of kraft lignin by using vanillin and lignin-based polyurethanes: Use of the biorefinery concept

Silva, E.A. Borges da; Zabkova, M.; Araújo, J.D.; Cateto, C.A.; Barreiro, M.F.; Belgacem, M.N.; Rodrigues, A.E.

In kraft pulp mills, the capacity of the recovery boiler is very often a limiting factor to the increase of the pulp production. Until several decades ago, an upgrade to boiler system for dealing with higher quantities of black liquor was the only alternative. The possibility of lignin extraction fr...

DRIVER (French)

2

Size exclusion chromatography of lignin in N-N-dimethylformamide/lithium bromide

Cateto, C.A.; Barreiro, M.F.; Belgacem, M.N.; Rodrigues, A.E.

The understanding of the macromolecular properties of lignin requires information on its molecular weight distributions. Size exclusion chromatography using DMF/LiBr as the mobile phase and PS-DVB gels as the stationary phase is a widely used system. In this study, two different lignin samples, Indu...

DRIVER (French)

3

Rigid polyurethane foams from lignin based polyols

Cateto, C.A.; Barreiro, M.F.; Rodrigues, A.E.; Belgacem, M.N.

Rigid polyurethane (RPU) foams were synthesized using lignin-based polyols obtained by an oxypropylation process. Alcell, Indulin AT, Curan 27-11P and Sarkanda lignins have been oxypropylated using formulations deduced from an optimization study with Alcell. L/PO/C (ratio between lignin, PO and cata...

DRIVER (French)

4

Polyurethanes as a viable route to valorise lignin

Cateto, C.A.; Barreiro, M.F.; Rodrigues, A.E.; Belgacem, M.N.

This work presents a study concerning the use of lignin as a macromonomer in polyurethane (PU) synthesis based on four lignin samples (Sarkanda (Granit SA), Indulin AT (MeadWestvaco), Curan 27-11P (BorregaardLigno Tech) and Alcell (Repap Enterprises)). The work started with lignin characterization, ...

DRIVER (French)

5

Oxypropylation of lignins and characterization of the ensuing polyols

Cateto, C.A.; Barreiro, M.F.; Rodrigues, A.E.; Belgacem, M.N.

Four lignin samples (Alcell, Indulin AT, Curan 27-11P and Sarkanda) were converted into liquid polyols by a chain extension reaction with propylene oxide (oxypropylation). The reaction was carried out in a batch reactor using potassium hydroxide (KOH) as a catalyst. The oxypropylation process was fi...

DRIVER (French)

6

Origin and diagenesis of lignin and carbohydrates in mangrove sediments of Guadeloupe (French West Indies): Evidence for a two-step evolution of organic deposits

Lallier-Vergès, Elisabeth; Marchand, Cyril; Disnar, Jean-Robert; Lottier, Nathalie

The mangroves of Grande Terre Island (Guadeloupe, French West Indies) are known to store large amounts of organic carbon, and organic-rich sediments have been described to several meters depth. The purpose of the present work was to precisely determine the molecular composition (carbohydrates and li...

DRIVER (French)

7

Optimization study of lignin oxypropylation in view of the preparation of polyurethane rigid foams

Cateto, C.A.; Barreiro, M.F.; Rodrigues, A.E.; Belgacem, M.N.

Four lignin samples (Alcell, Indulin AT, Curan 27-11P, and Sarkanda) were converted into liquid polyols by a chain extension reaction with propylene oxide (oxypropylation). The reaction was carried out in a batch reactor using potassium hydroxide (KOH) as the catalyst. The formulation was optimized ...

DRIVER (French)

8

FTIR and NMR studies on lignin acetylation

Cateto, C.A.; Barreiro, M.F.; Rodrigues, A.E.; Brochier-Salon, M.C.; Thielemans, W.; Belgacem, M.N.

In this work, a comparative study of an acetylation procedure, using four different lignin samples was performed. The chosen lignin samples, Indulin AT (Meadwestvaco), Alcell (Repap), Curan 27-11P (Borregaard LignoTech) and Sarkanda (Granit SA), represent both the guaiacyl and guaiacyl-syringyl type...

DRIVER (French)

9

Early diagenesis of carbohydrates and lignin in mangrove sediments subject to variable redox conditions (French Guiana).

Marchand, Cyril; Disnar, Jean-Robert; Lallier-Vergès, Elisabeth; Lottier, Nathalie

A comparative study of lignin and neutral carbohydrate compositions, combined with C, N and δ13C analyses, was carried out on sedimentary cores, and on various vascular plant species collected in mangrove swamps of French Guiana. The main purpose of this study was to assess the diagenesis of carbohy...

DRIVER (French)

10

Lignin-based polyurethane materials

Cateto, C.A.; Barreiro, M.F.; Rodrigues, A.E.; Belgacem, M.N.

DRIVER (French)