Production of furfural with high yields from corncob under extremely low water/solid ratios
Production of furfural with high yields from corncob under extremely low water/solid ratios
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极低水固比下以玉米芯高产率生产糠醛
DOI：
10.1016/j.renene.2018.07.095
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发表时间：
2019
期刊：
影响因子：
8.7
通讯作者：
Yuan Zhenhong
中科院分区：
文献类型：
--
作者：
Wang Qiong;Qi Wei;Wang Wen;Zhang Yu;Leksawasdi Noppol;Zhuang Xinshu;Yu Qiang;Yuan Zhenhong
糠醛被认为是来源于木质纤维素生物质的前30种潜在化学品之一。与传统的稀酸催化相比，通过向稀酸溶液中加入不混溶的有机溶剂，木质纤维素糠醛的生产得到显著改善。然而，高转化率通常在高水/固比（>1，v/m）下实现，并且糠醛产物分布在有机溶剂相和水相中，导致糠醛回收困难，并且增加了糠醛生产的成本。本文研究了在极低水固比（≤1）的稀硫酸-甲苯两相体系中玉米芯的转化。发现在1.5MPa N2、0.5：1水/固比（v/w）、10：1甲苯/固比（v/m）和3.85wt%H2SO4（在水相中）的条件下，在200%的高固体负载（在水相中）下在非常短的时间（10 min）内实现了高糠醛产率（65.67 mol%）。反应结束后，没有水相存在，糠醛完全积累在甲苯相中。进一步的研究表明，糠醛含量的大部分（84.73%，GC-MS检测）在甲苯相中，这有利于其回收。本工作为从木质纤维素生产糠醛提供了一种有效而廉价的方法。
Furfural is considered to be one of the top 30 potential chemicals derived from lignocellulosic biomass. Compared to conventional diluted acid catalysis, furfural production from lignocellulose was significantly improved by the addition of an immiscible organic solvent into the diluted acid solution. However, high conversion is usually achieved under a high water/solid ratio (>1, v/m), and the furfural product is distributed in both the organic solvent phase and the aqueous phase, leading to difficulty of furfural recovery and increasing the cost of furfural production. The present work investigated corncob conversion in a diluted sulfuric acid-toluene biphasic system with extremely low water/solid ratios (≤1). It was found that a high furfural yield (65.67 mol%) was achieved in a very short time (10 min) under a high solid loading of 200% (in the aqueous phase) under the conditions of 1.5 MPa N2, 0.5:1 water/solid ratio (v/w), 10:1 toluene/solid ratio (v/m), and 3.85 wt% H2SO4(in the aqueous phase). After the reaction, no aqueous phase existed, and furfural was completely accumulated in the toluene phase. Further research showed that the majority of the furfural content (84.73%, GC-MS detection) was in the toluene phase, which is beneficial for its recovery. This work provides an effective and inexpensive method for the production of furfural from lignocellulose.