催化裂化过程芳烃转化及生焦关系探索

在小型固定流化床试验装置上考察了催化剂微反活性和剂/油质量比对加氢蜡油催化裂化反应中芳烃转化以及生焦量的影响。根据焦炭产率变化，按转化率将加氢蜡油催化裂化反应分为3个阶段，分别考察了各阶段中芳烃转化以及生焦之间的关系。定义了催化剂表观活性概念，并以此考察了汽油芳烃摩尔产率和焦炭产率与催化剂表观活性的关系。通过分析各馏分段中芳烃含量及生焦量随催化剂表观活性的变化得出，芳烃特别是多环芳烃对生焦反应至关重要。在剂/油质量比相同条件下，随着催化剂微反活性增加，汽油芳烃含量和焦炭产率增大；原料转化率相同条件下，随着催化剂表观活性增加，焦炭产率增大。

Exploration of the Relationship Between Aromatics Conversion and Coking in Catalytic Cracking Process

The effects of operation parameters, such as catalyst microactivity and the mass ration of catalyst to oil ratio(CTO) on aromatics conversion and coking in VGO catalytic cracking process were investigated with a laboratory fixed fluidized bed reactor. According to the coke yield change and the reaction conversion rate, the VGO catalytic cracking process was divided into three stages, in which the relationship between aromatics conversion and coking was investigated, respectively. The concept of apparent catalyst activity(ACA) was defined. The relationships between the apparent catalyst activity and the gasoline aromatics molar yield as well as the coke mass yield were studied. By analyzing the aromatic content and coke amount changing in all distillates, it was found that aromatics, especially polycyclic aromatics were essential on coke formation. Under the condition of the same mass ratio of catalyst to oil, the gasoline aromatic content and coke yield increased with the increase of catalyst microactivity. Under the condition of the same conversion rate, the coke yield increased with the increase of apparent catalyst activity.