Using Sub/Supercritical CO2 as “Phase Separation Switch” for the Efficient Production of 5-Hydroxymethylfurfural from Fructose in an Ionic Liquid/Organic Biphasic System

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• 作者：Chunyan Shi ; Jiayu Xin ; Xiaomin Liu ; Xingmei Lu ; Suojiang Zhang
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2016
• 出版时间：February 1, 2016
• 年：2016
• 卷：4
• 期：2
• 页码：557-563
• 全文大小：298K
• ISSN：2168-0485

文摘

The formation of a series of side products causes low yield and difficult separation in 5-hydroxymethylfurfural (HMF) preparation. To overcome these problems, a novel switchable biphasic reaction/separation coupling system is proposed for the efficient preparation of HMF from fructose. The miscible ionic liquid (IL)/organic solvent is adjusted to two phases with CO₂ as the “phase separation switch”. Reactants and catalyst are mainly enriched in the IL phase and the produced HMF is continuously extracted into the organic solvent phase. This leads to 84% yield of HMF and the mass ratio of HMF in the organic solvent phase to the IL phase of 1.3:1 in a biphasic system. Comparing to several commonly used systems and a biphasic system, the switchable biphasic reaction/separation coupling system is more efficient for HMF preparation. On the basis of the results, a biphasic consecutive process for HMF preparation is also proposed, which is an effective production process through recycling of the inexpensive and abundantly available solvents and CO₂. It is expected that such a system may provide more applications for efficient reactions and separations in ILs.