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Issue 58, 2015
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Relevance of the acidic 1-butyl-3-methylimidazolium hydrogen sulphate ionic liquid in the selective catalysis of the biomass hemicellulose fraction

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Abstract

The ability of acidic 1-butyl-3-methylimidazolium hydrogen sulphate ionic liquid (IL) to hydrolyse and convert wheat straw into pivot compounds without additional catalyst was scrutinised. The pre-treatment with this IL allowed to obtain a liquor rich in hemicellulosic sugars, furans and organic acids, and a solid fraction constituted mainly of cellulose and lignin was obtained. Pre-treatment conditions such as temperature and residence time were set to produce xylose or furfural at a fixed 1/10 (w/w) biomass/IL ratio and 1.24% (w/w) water content in the pre-treatment process. Statistical modelling based on Doehlert experimental design was applied to establish optimal conditions to produce xylose and furfural. Temperature demonstrated a greater effect on the production of xylose, rather than the time of pre-treatment, and it was significantly incisive on furfural formation as well. To compare the reaction conditions, the severity factor for the studied IL was proposed and applied in this work. Furthermore, water was verified to have a large influence on the equilibrium of the hemicellulose hydrolysis. The increase of the water content close to 10% (w/w) in the system disfavoured xylose dehydration and thus allows increasing significantly the production of hemicellulose-derived monosaccharides. At last, an important disclosure in the reaction of biomass with [bmim][HSO4] is the formation of humins for high severity pre-treatment.

Graphical abstract: Relevance of the acidic 1-butyl-3-methylimidazolium hydrogen sulphate ionic liquid in the selective catalysis of the biomass hemicellulose fraction

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Supplementary files

Article information


Submitted
20 Apr 2015
Accepted
11 May 2015
First published
12 May 2015

RSC Adv., 2015,5, 47153-47164
Article type
Paper
Author version available

Relevance of the acidic 1-butyl-3-methylimidazolium hydrogen sulphate ionic liquid in the selective catalysis of the biomass hemicellulose fraction

A. V. Carvalho, A. M. da Costa Lopes and R. Bogel-Łukasik, RSC Adv., 2015, 5, 47153
DOI: 10.1039/C5RA07159C

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