Lignin Structure and Aggregation Behavior in a Two-Component Ionic Liquid Solvent System
Artikel i vetenskaplig tidskrift, 2014

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

Biomass

NMR

Lignin

GPC

Ionic liquids

Författare

Susanna Eriksson

Chalmers, Kemi- och bioteknik, Skogsindustriell kemiteknik

Tyrone Wells

Organisation okänd

Qining Sun

Organisation okänd

Art Ragauskas

Chalmers, Kemi- och bioteknik, Skogsindustriell kemiteknik

Hans Theliander

Chalmers, Kemi- och bioteknik, Skogsindustriell kemiteknik

Wallenberg Wood Science Center (WWSC)

BioResources

1930-2126 (ISSN)

Vol. 9 4 6002-6018

Ämneskategorier

Polymerkemi

Biomaterial

Polymerteknologi

Organisk kemi

Styrkeområden

Energi