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Issue 105, 2016
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Direct conversion of chitosan to 5-hydroxymethylfurfural in water using Brønsted–Lewis acidic ionic liquids as catalysts

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Abstract

The dehydration of chitosan to 5-hydroxymethylfurfural (HMF) via hydrothermal conversion was investigated in the presence of Brønsted–Lewis acidic ionic liquids. The catalytic effect of different Brønsted- and Lewis-acidic sites and the molar fraction of Lewis-acidic sites were investigated in detail. It was found that Brønsted–Lewis acidic ionic liquids ([Hmim][HSO4]–0.5FeCl2) exhibited good catalytic performance, furnishing HMF in 44.11% yield. Furthermore, the effects of reaction temperature, time, and amount of catalyst were also investigated. The optimal reaction conditions were obtained for a 1.25 wt% aqueous solution of the catalyst under hydrothermal conditions (180 °C for 4 h). A high HMF yield of 44.11% was obtained starting from 50 mg of chitosan. The Brønsted–Lewis acidic ionic liquid catalysts could be recycled by simple separation and exhibited constant activity in four successive trials.

Graphical abstract: Direct conversion of chitosan to 5-hydroxymethylfurfural in water using Brønsted–Lewis acidic ionic liquids as catalysts

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Publication details

The article was received on 24 Aug 2016, accepted on 23 Sep 2016 and first published on 28 Sep 2016


Article type: Paper
DOI: 10.1039/C6RA21289A
Citation: RSC Adv., 2016,6, 103774-103781
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    Direct conversion of chitosan to 5-hydroxymethylfurfural in water using Brønsted–Lewis acidic ionic liquids as catalysts

    Y. Jiang, H. Zang, S. Han, B. Yan, S. Yu and B. Cheng, RSC Adv., 2016, 6, 103774
    DOI: 10.1039/C6RA21289A

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