甲烷磺酸铝催化合成氯乙酸酯的性能研究

STUDY ON THE CATALYTIC ACTIVITY OF ALUMINIUM METHANESULFONATE IN SYNTHESIZING CHLOROACETATE

合成了甲烷磺酸铝,用热重和红外对其进行表征。并以甲烷磺酸铝为催化剂,研究其催化氯乙酸与异丙醇酯化反应中各种因素对酯化率的影响。反应条件为:醇酸摩尔比1.2∶1,催化剂摩尔分数1.0%(以酸的摩尔数计),反应时间2.5h,反应温度80～85℃,环己烷5mL作为带水剂,酯化率可达96.8%,反应后催化剂经过简单的相分离就可重复使用。与AlCl3·6H2O、Al2(SO4)3·18H2O及其它Lewis酸进行比较,甲烷磺酸铝的催化活性最好。用甲烷磺酸铝作催化剂合成其它氯乙酸酯,酯化率均在96.0%以上。

Aluminium methanesulfonate is synthesized and characterized by TGA and FTIR. Aluminium methanesulfonate is used as the catalyst in the esterification of chloroacetic acid with isopropanol. Various factors that affected the esterification have been investigated. Under the condition of 1.2∶1 molar ratio of isopropanol to chloroacetic acid, 1.0% catalyst (molar percent of chloroacetic acid), 2.5h reaction time, temperature 80～85℃,5mL cyclohexane as water-carrying agent, the esterification yield of isopropyl chloroacetate reaches 96.8%, after reaction the catalyst can be reused by simple phase-separation. Compared with aluminium chloride, aluminium sulfate and other Lewis acids, the catalytic activity of aluminium methanesulfonate is the best. Aluminium methanesulfonate is used as the catalyst in synthesizing other chloroacetate, the yield is over 96.0%.