氯铝酸盐离子液体催化焦化二甲苯中苯乙烯聚合反应

Polymerization of styrene in coking-derived xylene catalyzed by chloroaluminate ionic liquids

通过正交试验,考察盐酸三乙胺-三氯化铝离子液体对焦化二甲苯中苯乙烯转化率的影响。最佳反应条件为离子液体与焦化二甲苯质量比3:100、反应温度≤70℃、反应时间不超过30 min、盐酸三乙胺与三氯化铝物质的量比1:2.0。考察盐酸三乙胺与三氯化铝物质的量比及重复使用对焦化二甲苯中苯乙烯转化率的影响。焦化二甲苯中含有二甲基噻吩,是使催化剂失活的因素之一。

Polymerization of styrene in coking-derived xylene catalyzed by triethylamine hydrochloridealuminum chloride ionic liquids （Et3 NH-AlCl3 ） was studied by orthogonal experiments, including the influence of reaction temperature, reaction time and dosage of the ionic liquids on styrene conversion. The optimum condition was obtained as follows： m（IL） ： m（xylene） = 3： 100, reaction temperature ≤ 70 %, reaction time less than 30 min, n （ Et3 NH） ： n （ AlCl3 ） = 1 ： 2.0. Dosage of ionic liquids was the most influential factor on the polymerization. The influence of n （ Et3 NH） ： n （ AlCl3 ） and repeated use on styrene conversion was investigated. Dimethylthiophene in coking-derived xylene was one of the key cau- ses behind catalyst deactivation.