Issue 58, 2015

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

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

Supplementary files

Article information

Article type
Paper
Submitted
20 abr 2015
Accepted
11 mai 2015
First published
12 mai 2015

RSC Adv., 2015,5, 47153-47164

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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements