The operating conditions of a catalytic cracking MIP plant were optimized by reaction kinetic model based on the structure oriented lumping method. The distribution of average molecular weight of the products,the yield of the gasoline products and typical components in the gasoline along the riser height were investigated. The results showed that,the average molecular weight decreased rapidly in the first reaction zone with increasing the riser height,decreasing from 712 to 196 under the conditions of the outlet temperature of 515℃ and the mass ratio of catalyst to oil of 6.0,which indicated that the cracking reactions mainly occurred in the first reaction zone. The optimization results revealed that,under the conditions of the outlet temperature in the first reaction zone 500-510℃ and the mass ratio of catalyst to oil 6.5-7.0,the gasoline yield was higher than 50％ and the olefin content in the gasoline was lower than 24％(φ).%采用基于结构导向集总的催化裂化MIP工艺反应动力学模型对中国石化某分公司Ⅰ套催化裂化MIP装置的操作条件进行优化,考察了催化裂化产物的平均相对分子质量、汽油收率及汽油中典型组分的含量沿提升管高度的变化情况.实验结果表明,一反区平均相对分子质量随提升管高度的增加显著下降,当一反区出口温度为515℃,剂油质量比为6.0时,一反区平均相对分子质量由712下降为196,表明裂化反应主要发生在一反区;模型优化结果表明,在一反区出口温度500～510℃,剂油质量比6.5～7.0的条件下,汽油收率高于50％,汽油中烯烃含量低于24％(φ),满足国Ⅴ指标的要求.为工业催化裂化MIP装置的生产提供理论指导.
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