咪唑类酸性离子液体修饰磷钨酸盐催化剂在酯化反应中的应用  

Esterification Catalytic over Imidazolium Ionic Liquid Modified Salt of Phosphotungstic Acid Catalyst

作　　者：孟晓宇 栾庆洁 刘丽君[1] MENG Xiao-yu;LUAN Qing-jie;LIU Li-jun(School of Chemistry and Chemical Engineering,Liaocheng University,Liaocheng 252059,China)

机构地区：[1]聊城大学化学化工学院,山东聊城252059

出　　处：《聊城大学学报（自然科学版）》2017年第4期27-32,共6页Journal of Liaocheng University:Natural Science Edition

基　　金：山东省自然科学基金项目(ZR2017MB060);聊城大学大学生科技文化创新基金(26312170512)资助

摘　　要：通过离子液体1-磺酸丁基-3-甲基咪唑内盐与磷钨酸在水溶液中反应制备了一种固体酸催化剂[MIMSB]3PW12O40,利用XRD、FT-IR、电位滴定、SEM等方法对其进行了分析,并以正丁酸与正丁醇的酯化反应为探针反应,考察了该催化剂在酯化反应中的催化性能,系统探讨了催化剂用量、醇酸用量比、反应时间、反应温度等对催化反应的影响.结果表明,[MIMSB]3PW12O40催化剂仍保留了磷钨酸的Keggin结构,而且具有较高的酸强度;它在催化酯化反应中表现出较好的催化活性,丁酸丁酯的产率达到93.4%,而且方便回收,具有较好的稳定性.A solid acid was prepared by the reaction of phosphotungstic acid(HPW)with 1-methylimidazolium sulfobutyrolactone(MIMSB)and characterized by the methods of X-ray powder diffraction,FT-IR,potentiometric titration and SEM.Then the solid acid was employed for esterification to evaluate its acid-catalytic activity.Various reaction parameters,including catalyst dosage,reaction time,n-butanel/butyric acid molar ratio and reaction temperature were systematically examined.These results indicated that the prepared catalyst maintained the Keggin structure of the raw HPW,and had high acidity.The catalyst exhibited excellent catalytic activity in esterification of n-butyric acid and n-butanol.93.4%conversion of n-butyric acid was obtained under the optimized reaction conditions.The catalyst also had good stability.

关 键 词：杂多酸 离子液体 催化 酯化反应 

分 类 号：O643.3[理学—物理化学]