离子液体中Beta分子筛催化果糖产5羟甲基糠醛

5-Hydroxymethylfurfural Production From Fructose Using Beta Zeolite Catalyst in Ionic Liquid

摘要:

以离子液体氯化1丁基3甲基咪唑（［C4mim］Cl）为溶剂，考察了Beta分子筛对果糖脱水转化为5羟甲基糠醛（HMF）的催化性能，探讨了反应温度、反应时间、催化剂投加量和底物投加量对果糖转化率和HMF产率的影响，并进行了反应动力学分析.结果表明：以0.200 g果糖为底物，当催化剂投加量为0.140 g时，在100 °C下反应4 h后，HMF产率可达78.2%.对体系的回用研究表明，该催化体系经5次回用后仍具有较高活性.动力学分析结果表明，此体系下果糖脱水的活化能为53.9 kJ?mol-1.

Abstract:

A process for the dehydration of fructose into 5hydroxymethylfurfural (HMF) was developed in ionic liquid 1butyl3methyl imidazolium chloride (［C4mim］Cl) by using Beta zeolite as the catalyst. The effects of reaction temperature, reaction time, catalyst dosage and substrate dosage on the conversion of fructose and the yield of HMF were discussed, and the reaction kinetics was analyzed. Using 0.200 g fructose as the substrate, under the optimal conditions of catalyst dosage of 0.140 g, reaction temperature of 100 °C and reaction time of 4 h, the yield of HMF was 78.2%. The ionic liquid and catalyst could be recycled and exhibited constant activity within 5 cycles. The kinetics analysis indicates that the activation energy of the reaction was 53.9 kJ?mol-1.