Facile pulping of lignocellulosic biomass using choline acetate: Biomass; Pulping; Biopolymer recovery; Ionic liquids

Abstract : Treating ground bagasse or Southern yellow pine in the biodegradable ionic liquid (IL), choline acetate ([Cho][OAc]), at 100 degrees C for 24 h led to dissolution of hemicellulose and lignin, while leaving the cellulose pulp undissolved, with a 54.3% (bagasse) or 34.3% (pine) reduction in lignin content. The IL solution of the dissolved biopolymers can be separated from the undissolved particles either by addition of water (20 wt% of IL) followed by filtration or by centrifugation. Hemicellulose (19.0 wt% of original bagasse, 10.2 wt% of original pine, containing 14-18 wt% lignin) and lignin (5.0 wt% of original bagasse, 6.0 wt% of original pine) could be subsequently precipitated. The pulp obtained from [Cho][OAc] treatment can be rapidly dissolved in 1-ethyl-3-methylimidazolium acetate (e. g., 17 h for raw bagasse vs. 7 h for pulp), and precipitated as cellulose-rich material (CRM) with a lower lignin content (e. g., 23.6% for raw bagasse vs. 10.6% for CRM).
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Submitted on : Monday, April 25, 2016 - 3:14:20 PM
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Fangchao Cheng, Hui Wang, Gregory Chatel, Gabriela Gurau, Robin Rogers. Facile pulping of lignocellulosic biomass using choline acetate: Biomass; Pulping; Biopolymer recovery; Ionic liquids. Bioresource Technology, Elsevier, 2014, 164, pp.394-401. ⟨10.1016/j.biortech.2014.05.016⟩. ⟨hal-01306781⟩

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