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Eta, Valerie
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article
Switchable Ionic Liquids as Delignification Solvents for Lignocellulosic Materials
Abstract
The transformation of lignocellulosic materials into potentiallyvaluable resources is compromised by their complicated structure.Consequently, new economical and feasible conversion/fractionationtechniques that render value-added products are intensely investigated.Herein an unorthodox and feasible fractionation method of birch chips(B.pendula) using a switchable ionic liquid (SIL) derived from analkanol amine (monoethanol amine, MEA) and an organic super base(1,8-diazabicyclo-[5.4.0]-undec-7-ene, DBU) with two different triggeracid gases (CO2 and SO2) is studied. After SIL treatment, the dissolvedfractions were selectively separated by a step-wise method using anantisolvent to induce precipitation. The SIL was recycled afterconcentration and evaporation of anti-solvent. The composition ofundissolved wood after MEA-SO2-SIL treatment resulted in 80wt%cellulose, 10wt% hemicelluloses, and 3wt% lignin, whereas MEA-CO2-SILtreatment resulted in 66wt% cellulose, 12wt% hemicelluloses and 11wt%lignin. Thus, the MEA-SO2-SIL proved more efficient than theMEA-CO2-SIL, and a better solvent for lignin removal. All fractions wereanalyzed by gas chromatography (GC), Fourier transform infraredspectroscopy (FT-IR), C-13 nuclear magnetic resonance spectroscopy (NMR)and Gel permeation chromatography (GPC).