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Lignin Structure and Aggregation Behavior in a Two-Component Ionic Liquid Solvent System

Susanne Bylin (Institutionen för kemi- och bioteknik, Skogsindustriell kemiteknik) ; Tyrone Wells ; Qining Sun ; Arthur Ragauskas (Institutionen för kemi- och bioteknik, Skogsindustriell kemiteknik) ; Hans Theliander (Institutionen för kemi- och bioteknik, Skogsindustriell kemiteknik)
BioResources (1930-2126). Vol. 9 (2014), 4, p. 6002-6018.
[Artikel, refereegranskad vetenskaplig]

Ionic liquids are of potential interest in the processing of lignocellulosic biomass. In this study, the ionic liquid co-solvent system of 1-methylimidazole (MIM) and 1-ethyl-3-methyl-imidazolium acetate (EMIMAc) was used to solvate LignoBoost lignin fractionated from black liquor obtained from a kraft paper mill. Lignin ethanol-precipitated (LEP) and ethanol-soluble (LES) fractions were characterized via gel permeation chromatography (GPC) and 13C- and 31P-nuclear magnetic resonance spectroscopy (NMR) to determine structural characteristics and their relationship to polymer solubility in the system. Polymer integrity and solubility were optimal at ~20% lignin loading (w/w). Results showed that LEPs were generally of higher apparent molecular weight (Mw) and enriched with condensed/aliphatic ether linkages and aliphatic hydroxyls. The LESs had a lower apparent Mw and were enriched with carboxylic and phenolic groups. This newly gained knowledge on lignin fractionation and aggregation in the present solvent system provides future opportunities for tuning fractionation/extraction to suit a specific biomass-derived product, e.g., carbon fibers

Nyckelord: Lignin; Ionic liquids; Biomass; GPC; NMR



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Denna post skapades 2014-08-29. Senast ändrad 2015-01-09.
CPL Pubid: 202126

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Skogsindustriell kemiteknik (2005-2014)

Ämnesområden

Energi
Bioorganisk kemi
Polymerkemi
Polymerteknologi
Biomaterial

Chalmers infrastruktur