果糖在酸性离子液体中脱水制备5-羟甲基糠醛

doi:10.3724/SP.J.1095.2014.30316

摘要/Abstract

摘要： 制备了多种离子液体，并将其作为催化剂和溶剂催化果糖脱水制备5-羟甲基糠醛（HMF）。制备的酸性离子液体包括磺酸基功能化酸性离子液体、咪唑类酸性离子液体和吡啶类酸性离子液体。利用核磁共振仪和红外光谱仪对离子液体的结构进行表征。利用紫外可见光分光光度计结合Hammett指示剂计算Hammett酸度函数，比较了酸强度的大小对反应的影响。结果表明，离子液体的酸强度对反应有较大影响，在无其它催化剂和溶剂的情况下，离子液体具有较高的催化活性，通过使用1-丁基-3-甲基咪唑氯盐(BmimCl)作为催化剂，当反应温度为120 ℃，反应进行到4 h时，HMF收率可以达到74.97%。

关键词: 酸性离子液体, 果糖, 羟甲基糠醛, Hammett酸函数

Abstract: Conversion of fructose into 5-hydroxymethylfurfural(HMF) was investigated in various acidic ionic liquids as catalyst and solvent. The acidic ionic liquids include SO3H- functionalized ionic liquids, imidazole-based ionic liquids and pyridine-based acid ionic liquids. The catalysts were characterized by NMR and IR. The Hammett acidity function was obatined by UV-Vis measurements with an Hammett indicator. The acid strength was compared. The results show that the acid strength of catalysts affects the reaction. Ionic liquid has a high activity without the addition of other catalyst and solvent. When 1-butyl-3-methylimidazolium chloride(BmimCl) was used as the catalyst, the yield of HMF was 74.97% within 4 h at 120 ℃.

Key words: acidic ionic liquids, fructose, hydroxymethylfurfural, Hammett acid function

中图分类号:

O643

王福余, 刘艳丽, 王崇, 赵振波. 果糖在酸性离子液体中脱水制备5-羟甲基糠醛[J]. 应用化学, DOI: 10.3724/SP.J.1095.2014.30316.

WANG Fuyu, LIU Yanli, WANG Chong, ZHAO Zhenbo*. Dehydration of Fructose in Presence of Acidic Ionic Liquids to Prepare 5-Hydroxymethylfurfural[J]. Chinese Journal of Applied Chemistry, DOI: 10.3724/SP.J.1095.2014.30316.

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