Dehydration of fructose and sucrose into 5-hydroxymethylfurfural in the presence of 1-H-3-methyl imidazolium chloride acting both as solvent and catalyst
Dehydration of fructose and sucrose into 5-hydroxymethylfurfural in the presence of 1-H-3-methyl imidazolium chloride acting both as solvent and catalyst
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DOI：
10.1016/j.molcata.2006.03.046
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发表时间：
2006-07-01
影响因子：
--
通讯作者：
Vanoye, L
中科院分区：
文献类型：
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作者：
Moreau, C;Finiels, A;Vanoye, L
果糖的酸催化脱水在90 ℃下在微间歇反应器中进行，使用1-H-3-甲基咪唑氯化物，HMIM+Cl-，既作为溶剂又作为催化剂。在15-45分钟内，5-羟甲基糠醛（HMF）的产率高达92%。然后，可以获得每分钟和每mmol离子液体0.02 mmol HMF的生产率。与其他催化体系相比，一个显著的特征是5-羟甲基糠醛不分解，然后可以用乙醚以简单的方式单独或连续地萃取5-羟甲基糠醛，从而允许离子液体在除水后更容易地再循环。5-羟甲基糠醛不分解是由于与其他均相或非均相催化剂相比，在离子液体存在下计算的活化自由能较低，这使得在连续反应网络中，5-羟甲基糠醛中间体的形成几乎是定量的。在类似的操作条件下，蔗糖几乎定量地转化为HMF和未反应的葡萄糖。(c)2006 Elsevier B. V.保留所有权利。
The acid-catalyzed dehydration of fructose was performed in a microbatch reactor at 90 degrees C using 1-H-3-methylimidazolium 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. (c) 2006 Elsevier B.V. All rights reserved.