苯和乙烯液相烷基化合成乙苯的研究及其新工艺的开发

报道了苯和乙烯在ＡＥＢ型分子筛催化剂上进行液相烷基化反应合成乙苯的研究开发结果。通过研究反应温度、压力、苯／惭烯摩尔比及空速等反应条件对烷基化反应过程的影响，确定了适当的反应条件。进行了苯和乙烯液相烷基化的２０００ｈ活性稳定性试验，乙烯转化率、乙苯选择性、惭基化选择性分别平均为１００％、９４．５％和９９．０％。进行了苯和多乙苯液相烷基转移反 的２０００ｈ活性稳定性试验，二乙苯转化率、多乙苯转化率、

RESEARCH AND DEVELOPMENT OF ETHYL BENZENE SYNTHESIS BY BENZENE ALKYLATION WITH ETHYLENE IN LIQUID PHASE

Research and development results are reported for the synthesis of ethyl benzene by benzene alkylation with ethylene on AEB type zeolite catalyst in liquid phase. The influence of reaction conditions, including reaction temperature, pressure, benzene/ethylene molar ratio and space velocity, to reaction results was studied and the appropriate conditions were established. Activitystability experiment for the liquid phase alkylation of benzene with ethylene was proceeded for 2000hrs, the average values of ethylene conversion, ethylbenzene selectivity and ethylation selectivity were 100%, 94.5% and 99.0% respectively. Activitystability experiment for liquid phase transalkylation of benzene with multiethyl benzene was also conducted for 2000hrs, and the average values of diethyl benzene conversion, multiethyl benzene conversion and ethyl benzene selectivity were 75.5%, 72.7% and 98.7% respectively. These results showed that the AEB type catalyst has superior activity, selectivity and stability. A new process of liquid phase alkylation of benzene with ethylene was developed. The pilot plant scale up of 500kg catalyst was prepared, and the 400t/a pilot plant test was completed.