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Title: Enhanced conversion of xylan into furfural using acidic deep eutectic solvents with dual solvent and catalyst behavior
Author: Morais, Eduarda S.
Freire, Mara G.
Freire, Carmen S. R.
Coutinho, João A. P.
Silvestre, Armando J. D.
Keywords: Biomass
Deep eutectic solvents
Green solvents
Microwave heating
Issue Date: 21-Feb-2020
Publisher: Wiley‐VCH
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 γ-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 °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.
Peer review: yes
DOI: 10.1002/cssc.201902848
ISSN: 1864-5631
Publisher Version:
Appears in Collections:CICECO - Artigos
DQ - Artigos

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