Effects of pH on pretreatment of sugarcane bagasse using aqueous imidazolium ionic liquids


Autoria(s): Zhang, Zhanying; O'Hara, Ian M.; Doherty, William O.S.
Data(s)

01/02/2013

Resumo

Pretreatments of sugarcane bagasse for saccharification using different acid-catalysed imidazolium IL solutions (containing 20% water) at 130 °C for 30 min were investigated. At the same solution pH, pretreatment effectiveness in terms of glucan digestibility, delignification and xylan removal were similar for aqueous 1-butyl-3-methylimidazolium methane sulfonate (BMIMCH3SO3), 1-butyl-3-methylimidazolium methyl sulfate (BMIMCH3SO4), 1-ethyl-3-methylimidazolium chloride (EMIMCl) and 1-butyl-3-methylimidazolium chloride (BMIMCl). Decreasing solution pH of aqueous IL systems from 6.0 to 0.4 increased bagasse delignification and xylan removal, and as a result, improved glucan digestibility. The glucan digestibilities for bagasse samples pretreated by IL solutions with pH ≤ 0.9 were > 90% after 72 h of enzymatic hydrolysis. Without pH adjustment, the effectiveness of these aqueous IL solutions (except BMIMCH3SO3 because of its low natural pH of 0.9) to deconstruct the biomass was poor and the glucan digestibilities of pretreated bagasse samples were < 20%. These results show that pretreatment effectiveness of aqueous imidazolium ILs can simply be estimated from solution pH rather than hydrogen bond basicity (β) of the IL solution.

Formato

application/pdf

Identificador

http://eprints.qut.edu.au/59873/

Publicador

Royal Society of Chemistry

Relação

http://eprints.qut.edu.au/59873/1/Pretreatment_by_different_ILs_20120927_revised.pdf

DOI:10.1039/C2GC36084E

Zhang, Zhanying, O'Hara, Ian M., & Doherty, William O.S. (2013) Effects of pH on pretreatment of sugarcane bagasse using aqueous imidazolium ionic liquids. Green Chemistry, 15(2), pp. 431-438.

Direitos

Copyright 2013 Royal Society of Chemistry

Fonte

Centre for Tropical Crops and Biocommodities; Science & Engineering Faculty

Palavras-Chave #030504 Organic Green Chemistry #090402 Catalytic Process Engineering #pretreatment #sugarcane #bagasse #pH #imidazolium #ionic liquids
Tipo

Journal Article