کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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68938 | 48526 | 2006 | 5 صفحه PDF | دانلود رایگان |
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.
The commercially available ionic liquid 1-H-3-methyl imidazolium chloride catalyzes the dehydration of fructose and sucrose into 5-hydroxymethylfurfural in a nearly quantitative yield, at low temperature, short reaction time and relatively facile extraction of the final product and ionic liquid recycling. Figure optionsDownload as PowerPoint slide
Journal: Journal of Molecular Catalysis A: Chemical - Volume 253, Issues 1–2, 1 July 2006, Pages 165–169