SiO2掺杂磷钨酸催化合成水杨酸酯的研究  

Synthesis of salicylate catalyzed by SiO2 doped phosphotungstic acid

作　　者：蒋卫华[1] 王冉冉 陶永新[1] JIANG Wei-hua;WANG Ran-ran;TAO Yong-xin(School of Petrochemical Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学石油化工学院,江苏常州213164

出　　处：《现代化工》2020年第4期89-93,98,共6页Modern Chemical Industry

基　　金：国家自然科学基金(21775013)。

摘　　要：将自制的具有keggin结构的磷钨酸掺杂在溶胶-凝胶法制备的SiO2上作催化剂,以水杨酸和正丁醇为反应原料,对H3[α-PW12O40]-SiO2的催化性能进行研究。结果表明,当酸与醇的摩尔比为1∶6、催化剂质量为酸质量的12%、反应时间为2. 5 h、催化剂的负载量为10%时,酯化收率高达94%。催化剂循环使用3次,酯化收率变化不大。同时,在优化反应条件后,可较高收率地合成其他多种水杨酸酯。Self-made phosphotungstic acid with a Keggin structure is doped into SiO2 that is prepared by sol-gel method.The catalytic properties of as-prepared H3[α-PW12O40]-SiO2 are evaluated through using salicylic acid and nbutanol as raw materials to make salicylate.It is shown that the yield of esterification reaction can reach 94% when the molar ratio of salicylic acid to n-butanol is 1 ∶ 6,the dosage of catalyst is 12% that of acid mass,the reaction lasts for2. 5 h and the load of catalyst is 10%. The esterification yield remains stable after the catalyst is reused for 3 times without any treatment.Furthermore,many other salicylate esters can also be synthesized at a high yield under optimized reaction conditions.

关 键 词：溶胶-凝胶法 磷钨酸 二氧化硅 水杨酸酯 负载 酯化反应 

分 类 号：TQ245.2[化学工程—有机化工]