醚基复合氯铝酸离子液体催化异丁烷烷基化  

Alkylation of Isobutane with Butene over Ether-functionalized Composited Chloroaluminate Ionic Liquids

作　　者：张振华 赵国英[2] 卢丹[1] 汪敬恒[1] 任保增[1] 

机构地区：[1]郑州大学化工与能源学院,河南郑州450001 [2]中国科学院过程工程研究所离子液体清洁过程北京市重点实验室,北京100190

出　　处：《过程工程学报》2017年第5期1016-1022,共7页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:51374193;21676278);国家重点研发计划资助项目(编号:2016YFB0601303)

摘　　要：制备了4种醚基离子液体(1-甲氧基乙基-3-甲基咪唑氯盐[MOEMIM]Cl、1-甲氧基乙基-3-甲基咪唑溴盐[MOEMIM]Br、N,N,N-三甲基-N-甲氧基乙基溴化铵[N_(111,1O_2)]Br和N,N,N-三乙基-N-甲氧基乙基溴化铵[N_(222,1O_2)]Br),作为三乙胺盐酸盐氯铝酸离子液体的助剂催化异丁烷烷基化反应,考察了4种醚基离子液体及其添加量对氯铝酸离子液体催化烷基化的影响.结果表明,在反应温度25℃、进料速率500 mL/h、酸烃体积比20:60、添加6%(w)[MOEMIM]Cl的条件下,C8选择性由47.7%提高至63.6%,辛烷值(RON)由83.5提高至93.2.优化后的醚基复合氯铝酸离子液体催化剂至少循环20次活性不降低,显示了较好的催化性能.醚基离子液体助剂对烷基化性能的提高可归功于提高异丁烷溶解度、抑制酸度降低和提高界面性能.Four ether-functionalized ionic liquids including 1-methoxyethyl-3-methyl imidazole chloride（[MOEMIM]Cl）,1-methoxyethyl-3-methyl imidazole bromide（[MOEMIM]Br）,N,N,N-trimethyl-N-（2-methoxyethyl） ammonium bromide（[N_（111,1O_2）]Br）,N,N,N-triethyl-N-（2-methoxyethyl） ammonium bromide（[N_（222,1O_2）]Br）,were synthesized and applied as co-catalyst of triethylamine hydrochloride chloroaluminate ionic liquids for isobutane alkylation.The effect of four kinds of ionic liquids and the addition amounts on the catalytic performance of chloroaluminate ionic liquids had been systematically investigated.The results showed that addition of 6%（w） [MOEMIM]Cl into triethylamine hydrochloride chloroaluminate ionic liquids improved the C8 selectivity from 47.7% to 63.6% and research octane number（RON） from 83.5 to 93.2 at 25℃,500 m L/h feed rate,20：60 the volume ratio of acid to hydrocarbon.The optimized ether-functionalized composited ionic liquids catalyst could be reused for at least 20 times without loss activity.These enhancement is believed to result from the increased isobutane solubility,the inhibited acidity and improved interfacial properties.

关 键 词：氯铝酸离子液体 异丁烷 烷基化 醚基离子液体 催化 

分 类 号：TQ519[化学工程]