Dehydration of fructose and sucrose into 5-hydroxymethylfurfural in the presence of 1-H-3-methyl imidazolium chloride acting both as solvent and catalyst
✍ Scribed by Claude Moreau; Annie Finiels; Laurent Vanoye
- Publisher
- Elsevier Science
- Year
- 2006
- Tongue
- English
- Weight
- 231 KB
- Volume
- 253
- Category
- Article
- ISSN
- 1381-1169
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✦ Synopsis
The acid-catalyzed dehydration of fructose was performed in a microbatch reactor at 90 • C using 1-H-3-methyl imidazolium chloride, HMIM + Cl -, acting both as solvent and catalyst. A yield in 5-hydroxymethylfurfural (HMF) as high as 92% is achieved within 15-45 min. A productivity of 0.02 mmol of HMF, per min and per mmol of ionic liquid, can then be obtained. A remarkable feature, as compared with other catalytic systems, is the absence of decomposition of 5-hydroxymethylfurfural which can then be separately or continuously extracted in a simple manner with diethyl ether, thus allowing easier recycling of the ionic liquid after water removal. The absence of decomposition of 5-hydroxymethylfurfural is due to the lower free energy of activation calculated in the presence of the ionic liquid compared to other homogeneous or heterogeneous catalysts, which then makes, in a consecutive reaction network, the formation of the 5-hydroxymethylfurfural intermediate nearly quantitative.
Under similar operating conditions, sucrose is nearly quantitatively transformed into HMF and unreacted glucose.