Lewis酸离子液体催化的苯和氯乙烷烷基化反应

Alkylation of Benzene with Ethyl Chloride Catalyzed by Lewis Acidic Ionic Liquids

以Lewis酸离子液体为催化剂,考察了Lewis阴离子催化剂、加料方式、AlCl3/[Et3NH]Cl摩尔比、反应温度、苯/氯乙烷摩尔比、催化剂用量等因素对苯和氯乙烷烷基化反应的影响及离子液体的重复可用性.结果表明,在AlCl3/[Et3NH]Cl摩尔比为2的离子液体的催化作用下,苯和氯乙烷的烷基化反应在温度为70℃、苯/氯乙烷摩尔比为10:1、催化剂用量为苯和氯乙烷总质量10%的条件下,苯转化率为9.48%,乙苯选择性为93.65%;离子液体可循环使用10次,苯的转化率和乙苯的选择性均无明显变化.

Lewis acidic ionic liquid was used to catalyze the alkylation reaction of benzene with ethyl chloride.The effects of different Lewis anion catalysts,the feeding method,the molar ratios of AlCl3/[Et3NH]Cl,reaction temperature,the molar ratios of benzene to ethyl chloride,the amount of the catalyst and the reusability of the ionic liquid on the alkylation reaction were studied.Under the optimal conditions of 70℃,molar ratios of benzene/ethyl chloride at 10,amount of catalyst at 10% by weight,the benzene conversion rate reached 9.48% and the ethyl benzene selectivity was 93.65%,further more,the [Et3NH]Cl-2AlCl3（molar ratio of AlCl3 to [Et3NH]Cl was 2） as a catalyst for such reaction could be recycled,and the catalyst activity and selectivity had minor changes after 10 cycles.