Issue 2, 2008

Acid in ionic liquid: An efficient system for hydrolysis of lignocellulose

Abstract

Acid in ionic liquid was demonstrated as an efficient system for hydrolysis of lignocellulosic materials with improved total reducing sugars (TRS) yield under mild conditions. TRS yields were up to 66%, 74%, 81% and 68% for hydrolysis of corn stalk, rice straw, pine wood and bagasse, respectively, in C4mimCl in the presence of 7 wt% hydrogen chloride at 100 °C under atmospheric pressure within 60 min. Different combinations between ionic liquids, such as C6mimCl, C4mimBr, AmimCl, C4mimHSO4, and SbmimHSO4, and acids, including sulfuric acid, nitric acid, phosphoric acid, as well as maleic acid, afforded similar results albeit longer reaction time was generally required comparing with the combination of C4mimCl and hydrochloric acid. FT-IR spectra and elemental analysis of the recovered residues indicated that modification of lignin occurred during sulfuric acid catalyzed hydrolysis. In addition, kinetic modeling based on experimental data suggested that the hydrolysis likely followed a consecutive first-order reaction sequence, where k1 and k2, the rate constants for TRS formation and TRS degradation, were determined as 0.068 min−1 and 0.007 min−1, respectively. This novel system may be valuable to facilitate cost-efficient conversion of biomass into biofuels and biobased products.

Graphical abstract: Acid in ionic liquid: An efficient system for hydrolysis of lignocellulose

Article information

Article type
Paper
Submitted
27 Jul 2007
Accepted
03 Dec 2007
First published
17 Dec 2007

Green Chem., 2008,10, 177-182

Acid in ionic liquid: An efficient system for hydrolysis of lignocellulose

C. Li, Q. Wang and Z. K. Zhao, Green Chem., 2008, 10, 177 DOI: 10.1039/B711512A

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