氯铝酸离子液体催化苯与氯乙烷合成乙苯

以氯铝酸离子液体([Et3NH]Cl-AlCl3)为催化剂,催化苯与氯乙烷烷基化反应合成乙苯,考察了反应投料方式、原料配比、反应温度、反应时间和[Et3NH]Cl-AlCl3用量对烷基化反应的影响,并对比了[Et3NH]Cl-AlCl3和AlCl3的催化效果。实验结果表明,在间歇式和半间歇式两种投料方式下,最佳反应条件均为:反应温度70℃,n(苯)∶n(氯乙烷)=(8.0～10.0)∶1,催化剂用量为原料总质量的10%,反应时间20～30 min;半间歇式反应的苯转化率和乙苯选择性均高于间歇式反应,半间歇式反应的苯转化率可达到9.48%,乙苯选择性为93.65%;[Et3NH]Cl-AlCl3的催化活性明显高于AlCl3。

Synthesis of Ethylbenzene from Ethyl Chloride and Benzene Catalyzed by Chloroaluminate Ionic Liquid

Chloroaluminate ionic liquid catalyst was used in alkylation of benzene with ethyl chloride to ethyl benzene.The effects of feeding mode,ratio between the reactants,reaction temperature and catalyst dosage on the alkylation were studied.The catalyses of Cl-AlCl3 ionic liquid and AlCl3 in the alkylation were compared.The results indicated that under the optimum conditions of reaction temperature 70 ℃,n(benzene)∶n(ethyl chloride) 8.0-10.0 : 1,catalyst dosage(based on the total reactant mass) 10%,reaction time 20-30 min and semi-batch feeding mode,the conversion of benzene and the selectivity to ethyl benzene could reach 9.48% and 93.65%,respectively.Catalytic activity of Cl-AlCl3 ionic liquid in the alkylation was significantly higher than that of aluminum chloride.