The experimental investigation of boiling point alkylation of benzene with propylene over YSBH-3 zeolite catalyst was carried out in a fixed bed reactor under 2 MPa pressure. The influence of the physical state of reaction materials (from liquid to boiling point and gas phase) on the performance of YSBH-3 zeolite catalyst was researched, and the alkylation process was compared between 2 MPa and 3 MPa operating pressure. The results show: (1) YSBH-3 zeolite catalyst has better catalytic performance under 2 MPa operating pressure than 3 MPa, it can reache higher isopropylbenzene selectivity and lower di-istopropylbenzene and tri-isopropylbenzene selectivity, (2) Under 2 MPa pressure, the boiling point alkylation of benzene with propylene can obtain the highest isopropylbenzene selectivity and the lowest di-isopropylbenzene, tri-isopropylbenzene and n-propylbenzene selectivity among these three of physical state of liquid to boiling point and gas phase for reaction materials, this result is very benefit to improving the produce quality and reducing production cost. Subsequently, with the Single-Factor test method, the effects of liquid space velocity (5-35 h-1) and benzene/propylene molar ratio (5-12) on the boiling point alkylation process were studied, respectively, the appropriate alkylation condition ranges for the isopropylbenzene synthesis are 2 MPa, molar ratio of benzene to propylene 8:1-10:1 and liquid space velocity 9-11 h-1.%采用等温固定床积分反应器,对YSBH-3分子筛催化剂上苯与丙烯烷基化合成异丙苯进行了实验研究,系统考察了反应体系相态变化(液相反应→泡点反应→气相反应)对YSBH-3分子筛催化剂性能的影响,并与工业YSBH-3分子筛催化剂的液相烷基化(操作压力3MPa)结果进行了对比分析.结果表明( 1)YSBH-3分子筛催化剂在2 MPa操作压力下的性能明显优于3 MPa操作压力下的性能,具有更高的异丙苯选择性和更低的二异丙苯和三异丙苯选择性；(2)与2 MPa下气相和液相烷基化结果相比,2 MPa泡点温度下进行苯与丙烯烷基化具有最高的异丙苯选择性,更低的二异丙苯、三异丙苯和正丙苯选择性.这一结论对提高工业装置的异丙苯产品质量、降低后续分离工段负荷和减少烷基转移反应器处理量非常有利.以单因素实验法系统考察了液相空速(5～35 h-1)和苯与丙烯的物质的量之比(5～12)对2 MPa压力下、苯与丙烯泡点烷基化的影响,最终确定的相对适宜泡点烷基化工艺条件范围为:压力2 MPa,苯与丙烯的物质的量之比8∶1～10∶1(对应的泡点温度为176～184℃),液相空速8～1 1 h-1.在此条件下,丙烯转化率保持在99％以上,异丙苯和二异丙苯选择性分别保持在86％和13％左右.
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