Journal
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
Volume 167, Issue 7, Pages 1921-1937Publisher
SPRINGER
DOI: 10.1007/s12010-012-9742-4
Keywords
Lignocellulose fractionation; Ionic liquids; Dilute acid pretreatment; 1-Ethyl-3-methylimidazolium acetate; 1-Butyl-3-methylimidazolium methyl sulfate
Funding
- TSB Sugar
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Biorefineries processing lignocellulose will produce chemicals and fuels from chemical constituents, cellulose, hemicelluloses, and lignin to replace fossil-derived products. Fractionation of sugarcane bagasse into three pure streams of chemical constituents was addressed through dissolution of constituents with the ionic liquids, 1-ethyl-3-methylimidazolium acetate ([EMiM]CH3COO) or 1-butyl-3-methylimidazolium methyl sulfate ([BMiM]MeSO4). Constituents were isolated from the reaction mixture with the anti-solvents acetone (AEuro), acetone-water (AW), and sodium hydroxide (NaOH). Delignification was enhanced by NaOH, although resulting in impure product streams. Xylose pre-extraction (75 % w/w) by dilute acid pretreatment, prior to ionic liquid treatment, improved lignin purity after anti-solvent separation. Fractionation efficiency of the combined process was maximized (84 %) by ionic liquid treatment at 125 A degrees C for 120 min, resulting in 80.2 % (w/w) lignin removal and 76.5 % (w/w) lignin recovery. Ionic liquids achieved similar degrees of delignification, although fully digestible cellulose-rich solids were produced only by [EMiM]CH3COO treatment.
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