Chinese Journal of Applied Chemistry

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Dehydration of Fructose in Presence of Acidic Ionic Liquids to Prepare 5-Hydroxymethylfurfural

WANG Fuyu, LIU Yanli, WANG Chong, ZHAO Zhenbo*   

  1. (School of Chemistry and Life Science,Changchun University of Technology,Changchun 130012,China)
  • Received:2013-06-25 Revised:2013-08-26 Published:2014-04-10 Online:2014-04-10
  • Contact: ZHAO ZHEN-Bo

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

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