Enhanced Conversion of Xylan into Furfural using Acidic Deep Eutectic Solvents with Dual Solvent and Catalyst Behavior
authors Morais, ES; Freire, MG; Freire, CSR; Coutinho, JAP; Silvestre, AJD
nationality International
journal CHEMSUSCHEM
author keywords biomass; deep eutectic solvents; furfural; green solvents; microwave heating
keywords LIGNOCELLULOSIC BIOMASS; HEMICELLULOSE; XYLOSE; POLYSACCHARIDES; DERIVATIVES; HYDROLYSIS; CHEMISTRY; LIGNIN; MEDIA; DES
abstract An efficient process for the production of furfural from xylan by using acidic deep eutectic solvents (DESs), which act both as solvents and catalysts, is developed. DESs composed of cholinium chloride ([Ch]Cl) and malic acid or glycolic acid at different molar ratios, and the effects of water and gamma-valerolactone (GVL) contents, solid/liquid (S/L) ratio, and microwave heating are investigated. The best furfural yields are obtained with the DES [Ch]Cl:malic acid (1:3 molar ratio)+5 wt % water, under microwave heating for 2.5 min at 150 degrees C, a S/L ratio of 0.050, and GVL at a weight ratio of 2:1. Under these conditions, a remarkable furfural yield (75 %) is obtained. Direct distillation of furfural from the DES/GVL solvent and distillation from 2-methyltetrahydrofuran (2-MeTHF) after a back-extraction step enable 89 % furfural recovery from 2-MeTHF. This strategy allows recycling of the DES/GVL for at least three times with only small losses in furfural yield (>69 %). This is the fastest and highest-yielding process reported for furfural production using bio-based DESs as solvents and catalysts, paving the way for scale-up of the process.
publisher WILEY-V C H VERLAG GMBH
issn 1864-5631
year published 2020
volume 13
issue 4
beginning page 784
ending page 790
digital object identifier (doi) 10.1002/cssc.201902848
web of science category Chemistry, Multidisciplinary; Green & Sustainable Science & Technology
subject category Chemistry; Science & Technology - Other Topics
unique article identifier WOS:000508416600001
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journal impact factor 7.962
5 year journal impact factor 7.928
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