【摘要】 采用对甲苯磺酸和吡啶盐类离子液体形成的双组分催化剂催化苯和环己烯合成环己基苯,该工艺具有反应条件温和、易操作、无污染和收率高的特点。主要考察了离子液体种类、反应时间、反应温度、催化剂用量、反应物配比及催化剂的循环使用次数等因素对反应收率的影响。通过单因素优选法确定了最佳反应工艺:离子液体为N-甲基吡啶硫酸甲基盐、反应时间40 min、反应温度为60℃、双组份催化剂(对甲苯磺酸/(N-甲基吡啶硫酸甲基盐(w/w)=1:1)用量为反应底物的7.4%(wt)、苯和环己烯的质量比为12.5:1、催化剂循环5次以上仍然具有很高的活性。在最佳反应工艺条件下,环己基苯的收率为99.5%,气相分析纯度为99.9%。更多还原

【Abstract】 Cyclohexylbenzene was prepared by alkylation of benzene and cyclohexene using pyridine-based ionic liquid and p-toluenesulfonic acid systems. This process has the advantages of mild reaction conditions, easy operation, no pollution and high yield. The effects of ionic liquid types, reaction time and temperature, catalyst and reactant weight ratios and catalyst reusing on the yield of cyclohexylbenzene were investigated and the process was optimized. The results show that the system has the best performance under following conditions: ionic liquid: N-methylpyridinium methylsulfate, reaction time: 40 min, reaction temperature: 60℃, m(catalyst)/m(all substrate)=7.4%, m(benzene)/m(cyclohexene)=12.5:1. The catalyst maintained good activity after being reused for 5 times. Under the optimum conditions, the yield of ethyl cyclohexene is 99.5% and the purity is 99.9%.更多还原