The undesirable acetylation of cellulose by the acetate ion of 1-ethyl-3-methylimidazolium acetate |
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Authors: | Sergios Kimon Karatzos Leslie Alan Edye Robert Mark Wellard |
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Affiliation: | (1) School of Chemistry, Queensland University of Technology, GPO Box 2434, Brisbane, QLD, 4001, Australia;(2) Faculty of Forestry, Department of Wood Science, University of British Columbia, 4037-2424 Main Mall, Vancouver, BC, V6T1Z4, Canada |
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Abstract: | Abstract The ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate ([C2mim]OAc) is considered to be an inert solvent of cellulose and lignocellulosic biomass. Acetylation (1.7% mol, or DS 0.017) of cellulose after dissolution in technical grade [C2mim]OAc (150 °C for 20 min), is demonstrated by compositional analysis, FTIR analysis and 13C NMR spectroscopy (in [C2mim]OAc with 13C enriched acetate). This acetylation, in the absence of added acylating agents, has not been reported before and may limit [C2mim]OAc utility in industrial scale biomass processing, even at this low extent. For example, cellulose acetylation may contribute to IL loss in processes where the IL is recovered and reused and inhibit enzyme saccharification of cellulose in lignocellulosic biofuel production processes based on saccharification and fermentation. |
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