NDLI: Production of 5-hydroxymethylfurfural from fructose by a thermo-regulated and recyclable Brønsted acidic ionic liquid catalyst

Content Provider	Royal Society of Chemistry (RSC)
Author	Eli, Wumanjiang Islam, Nurali Guan, Shuzhe Mamat, Xamxikamar Gao, Zhixian Li, Hongyi Ma, Yubo Wang, Lei Wang, Tianfu Qing, Shaojun
Copyright Year	2015
Abstract	In this work, a thermo-regulated recyclable catalytic system using ionic liquid [HO2CMMIm]Cl as the catalyst and isopropanol as the solvent has been demonstrated to be effective for the dehydration of fructose to synthesize 5-hydroxymethylfurfural (HMF). The solubility of [HO2CMMIm]Cl ionic liquid in isopropanol is temperature-dependent, being miscible with isopropanol at a temperature range suitable for fructose dehydration (e.g., above 80 °C) while not soluble at lower temperatures such as room temperature. Temperature-responsive solubilization/precipitation of [HO2CMMIm]Cl in isopropanol renders the acidic ionic liquid an appealing thermo-regulated phase-switchable catalyst. Furthermore, the effects of various parameters including catalyst loading, fructose concentration, reaction time and temperature on the catalytic performance of fructose dehydration have been studied systematically. Under optimized reaction conditions, up to 91.2 mol% HMF yield could be obtained. Additionally, when the ionic liquid catalyst precipitated out after the reaction, the solvent can be simply decanted and [HO2CMMIm]Cl could be directly reused for the next run with freshly added solvent and substrate. It was found that [HO2CMMIm]Cl could be reused at least five times without considerable loss of activity. Furthermore, a kinetic analysis was carried out, indicating the activation energy for the reaction to be 62.1 kJ mol−1. This catalytic system can be envisioned to find applications in a wide range of acid-catalyzed reactions with facile, thermo-regulated catalyst recovery features.
Starting Page	47377
Ending Page	47383
Page Count	7
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	5
Issue Number	59
Journal	RSC Advances
DOI	10.1039/c5ra08107f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Isopropyl alcohol Hydroxymethylfurfural Miscibility Solvent Dehydration reaction Activation energy Fructose Ionic liquid
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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