Pretreatment and fractionation of wheat straw using various ionic liquids

Lopes, André; João, Karen; Bogel-Lukasik, Ewa; Roseiro, Luisa B.; Lukasik, Rafal M.

http://hdl.handle.net/10400.9/2336

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Abstract(s)

Pretreatment of lignocellulosic biomass with ionic liquids (ILs) is a promising and challenging process for an alternative method of biomass processing. The present work emphasizes the examination of wheat straw pretreatment using ILs, namely, 1-butyl-3-methylimidazolium hydrogensulfate ([bmim][HSO4]), 1-butyl-3-methylimidazolium thiocyanate ([bmim]-[SCN]), and 1-butyl-3-methylimidazolium dicyanamide ([bmim][N(CN)2]). Only [bmim][HSO4] was found to achieve a macroscopic complete dissolution of wheat straw during pretreatment. The fractionation process demonstrated to be dependent on the IL used. Using [bmim][SCN], a high-purity lignin-rich material was obtained. In contrast, [bmim][N(CN)2] was a good solvent to produce high-purity carbohydrate-rich fractions. When [bmim][HSO4] was used, a different behavior was observed, exhibiting similarities to an acid hydrolysis pretreatment, and no hemicellulose-rich material was recovered during fractionation. A capillary electrophoresis (CE) technique allowed for a better understanding of this phenomenon. Hydrolysis of carbohydrates was confirmed, although an extended degradation of monosaccharides to furfural and hydroxymethylfurfural (HMF) was observed.

Keywords

Green solvents Fractionation Cellulose Hemicellulose Lignin Capillary Electrophoresis

URI

http://hdl.handle.net/10400.9/2336

Citation

Lopes, André da C.; João, Karen G.; Bogel-Lukasik, E.; Roseiro, Luísa B.; Bogel-Lukasik, R. Pretreatment and fractionation of wheat straw using various ionic liquids. In: Journal of Agricultural and Food Chemistry, 2013, Vol. 61, nº 33, p. 7874–7882