Back to Search Start Over

Understanding lignin treatment in dialkylimidazolium-based ionic liquid-water mixtures.

Authors :
Yan B
Li K
Wei L
Ma Y
Shao G
Zhao D
Wan W
Song L
Source :
Bioresource technology [Bioresour Technol] 2015 Nov; Vol. 196, pp. 509-17. Date of Electronic Publication: 2015 Aug 07.
Publication Year :
2015

Abstract

The treatment of enzymatically hydrolyzed lignin (EHL) in dialkylimidazolium-based ionic liquid (IL)-water mixtures (50-100wt% IL content) was investigated at 150°C for 3h. pH, IL type, and IL content were found to greatly influence the degradation of lignin and the structure of regenerated lignin. 1-Butyl-3-methylimidazolium methylsulfonate-water mixtures with low pH facilitated lignin depolymerization but destroyed the regenerated lignin substructure. Regenerated lignin with low molecular weight and narrow polydispersity index (2.2-7.7) was obtained using a 1-butyl-3-methylimidazolium acetate-based system. Water addition inhibited lignin depolymerization at 50-100wt% IL content, except for 70wt% 1-butyl-3-methylimidazolium chloride-water mixture. Compared with pure IL treatment, obvious differences were observed in the breakdown of inter-unit linkages and ratio of syringyl to guaiacyl units in regenerated lignin with IL-water treatment.<br /> (Copyright © 2015 Elsevier Ltd. All rights reserved.)

Details

Language :
English
ISSN :
1873-2976
Volume :
196
Database :
MEDLINE
Journal :
Bioresource technology
Publication Type :
Academic Journal
Accession number :
26282782
Full Text :
https://doi.org/10.1016/j.biortech.2015.08.005