葡萄糖脱水制备5-羟甲基糠醛的反应动力学研究

Reaction Kinetics for Dehydration of Glucose into 5-Hydroxymethylfurfural

以纤维素基固体酸为催化剂,在1-丁基-3-甲基咪唑氯盐([BMIM]Cl)中对葡萄糖制备5-羟甲基糠醛的脱水过程进行了研究.实验结果表明,葡萄糖脱水的主、副反应均符合一级反应速率方程,葡萄糖脱水形成5-羟甲基糠醛(主反应)的活化能和指前因子分别为86.9kJ·mol-1和1.46×1010 min-1;葡萄糖脱水形成其他产物(副反应)的活化能和指前因子分别为124.1kJ·mol-1和3.55×1013 min-1.随着反应温度的升高,葡萄糖脱水的主、副反应速率常数均会相应的增加,副反应速率常数比主反应速率常数增加的更快.

The dehydration of glucose into 5-hydroxymethylfurfural over cellulose-derived carbonaceous catalyst was studied in 1-butyl-3-methylimidazolium chloride（[BMIM]Cl）.The results indicated that the main and side reaction kinetics for the dehydration of glucose were determined to be the first-order reaction rate equations,the activation energy and pre-exponential factor of the main reaction（the dehydration of glucose into 5-hydroxymethylfurfural）were 86.9 kJ·mol-1 and 1.46×1010 min-1,the corresponding values of the side reaction（the dehydration of glucose into other products）were 124.1 kJ·mol-1 and 3.55×1013 min-1,respectively.Moreover,when the reaction temperature was increased,the main and side reaction rate constants for the dehydration of glucose would be increased.