Enhanced Conversion of Xylan into Furfural using Acidic Deep Eutectic Solvents with Dual Solvent and Catalyst Behavior,ChemSusChem

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Enhanced Conversion of Xylan into Furfural using Acidic Deep Eutectic Solvents with Dual Solvent and Catalyst Behavior
ChemSusChem ( IF 7.5 ) Pub Date : 2020-01-21 , DOI: 10.1002/cssc.201902848
Eduarda S. Morais ₁ , Mara G. Freire ₁ , Carmen S. R. Freire ₁ , João A. P. Coutinho ₁ , Armando J. D. Silvestre ₁

Affiliation

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.

中文翻译：

具有双重溶剂和催化剂行为的酸性深共晶溶剂可增强木聚糖向糠醛的转化

开发了一种通过使用酸性深低共熔溶剂（DESs）从木聚糖生产糠醛的有效方法，该溶剂同时充当溶剂和催化剂。由氯化胆碱（[Ch] Cl）和苹果酸或乙醇酸以不同的摩尔比组成的DES，以及水和γ-戊内酯（GVL）含量，固/液（S / L）比和微波加热的影响为调查。在150°C下微波加热2.5分钟，S / L比为0.050和GVL的情况下，用DES [Ch] Cl：苹果酸（1：3摩尔比）+5 wt％的水可获得最佳糠醛收率。重量比为2：1。在这些条件下，可获得显着的糠醛收率（75％）。通过DES / GVL溶剂直接蒸馏糠醛，并在反萃取步骤后从2-甲基四氢呋喃（2-MeTHF）蒸馏，可从2-MeTHF中回收89％糠醛。该策略可将DES / GVL回收至少三次，糠醛收率损失很小（> 69％）。这是使用生物基DES作为溶剂和催化剂生产糠醛生产中最快，产量最高的工艺，为工艺规模扩大铺平了道路。

更新日期：2020-01-23

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