沸石催化剂上苯与乙烯液相烷基化反应的研究

采用微型等温积分反应器,对改性β沸石催化剂上苯与乙烯液相烷基化反应进行了实验研究。通过考察反应温度、苯烯摩尔比和乙烯质量空速对催化剂性能的影响,获得了如下适宜工艺条件:反应温度190～220℃ ,苯烯摩尔比6～8,乙烯质量空速≤2h^-1。在此条件下,乙烯转化率在99.0%以上,乙苯选择性可达93%,乙基化选择性不低于99.0%。苯与乙烯液相烷基化稳定性实验表明,乙烯转化率和乙苯选择性未出现随反应时间延长而降低的现象,表明该沸石催化剂具有良好的活性稳定性.在所考察实验范围内,基本上检测不到二甲苯,其它烷基化副产物的含量也处于极低水平。

Liquid-phase alkylation of benzene with ethylene over zeolite catalyst

The liquid-phase alkylation of benzene with ethylene over a domestic modified zeolite catalyst was carried out in an integral micro-reactor. The effects of temperature, benzene to ethylene molar ratio and the weight hourly space velocity of ethylene on the catalyst performance were studied, respectively. And the appropriate operating conditions for ethylbenzene synthesis were decided as follows: temperature 190～220℃,benzene/ethylene molar ratio 6～8 and the weight hourly space velocity of ethylene≤2h^-1 under these conditions ,the ethylene conversion,thylbenzene selectivity were more than 99.0%,93% and 99.0%,respectively.The stability test of the catalyst was also carried out.The conversion of ethylene and the selectivity of ethylbenzene were not decreased with reaction time.It was indicated this type of modified zeolite catalyst has a good active stability.Under the condtions,the dimethylbenzene was not detected and the contents of other byproducts were very low.