Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 2, Issue 9, Pages 2159-2164Publisher
AMER CHEMICAL SOC
DOI: 10.1021/sc5003424
Keywords
Lignin; Ionic liquids; Depolymerization; Redistribution; Biomass
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Nowadays, ionic liquids (ILs) have been recognized as a promising way to fractionate biomass. In this study, we discuss how lignin depolymerization was achieved via the redistribution mechanism with phenols in ionic liquids. Two ionic liquids (1-ethyl-3-methylimidazolium xylenesulfonate [emim][ABS] and 1-butyl-3-methylimidazolium methyl-sulfate [bminn][MeSO4]) were selected as a solvent for lignin depolymerization. Before embarking on lignin depolymerization, two selected lignins (organosolv lignin and Klason lignin) were characterized based on their chemical structure and molecular weight. The depolymerized results show that the two lignins (organosolv lignin and Klason lignin) can be extensively depolymerized under oxidative conditions using a Cu/EDTA complex in the presence of a monomeric phenol (4-tert-butyl-2,6-dimethylphenol) that is blocked from oxidative coupling in the ortho and para positions at temperatures of 180 degrees C.
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