异丙苯裂化反应路径及苯生成影响因素分析

在催化裂化反应条件下，研究了异丙苯主要裂化反应路径以及反应过程中反应温度和分子筛类型对苯产率和选择性的影响规律。结果表明，异丙苯裂化中的主要反应为脱烷基反应和侧链质子化裂化反应，苯主要来自异丙苯的脱烷基反应；高温和择形分子筛有助于提高异丙苯裂化生成苯的产率和选择性；在反应温度为550℃、质量空速为8h-1、剂油质量比为6的条件下，异丙苯在择形分子筛催化剂上裂化生成苯的产率和选择性分别可达40%和55%以上。

REACTION PATHWAYS AND INFLUENCE OF PARAMETERS ON BENZENE FORMATION DURING CATALYTIC CRACKING OF CUMENE

The dominant reaction pathways and the effect of reaction temperature and type of zeolites on the yield and selectivity of benzene formed during catalytic cracking of cumene were investigated. The results indicated that the main reactions of cumene cracking were dealkylation and protolytic cracking of alkyl side chain. Benzene was mainly formed by the dealkylation reaction. High reaction temperature and the existence of shape selective zeolite were in favor of benzene formation during cumene cracking. Under the conditions of a reaction temperature of 550℃, a WHSV of 8h-1 and a catalyst/oil weight ratio of 6, the yield and selectivity of benzene over shape selective zeolite catalyst were more than 40% and 55%, respectively.