催化裂化顶循环油裂化性能的研究

在小型固定流化床实验装置(FFB)上，采用MLC-500裂化催化剂，在空速5 h-1、剂油质量比8、反应温度460～540 ℃的条件下对顶循环油裂化性能进行研究。结果表明，在裂化过程中，有17.41%的顶循环油转化为汽油馏分，有利于提高催化裂化汽油产率；液体产物中低碳数、高辛烷值组分含量高，催化裂化汽油产物中芳烃质量分数达50%以上。汽油产物中的芳烃主要来自于顶循环油中烷基苯的裂化反应，该途径的贡献超过75%。在此基础上，提出顶循环油中各组分在催化裂化过程中的理想反应模式。

STUDY ON CATALYTIC CRACKING PERFORMANCE OF FCC TOP REFLUX

The study on catalytic cracking performance of FCC top reflux was conducted on a fixed fluidized bed reactor (FFB) with MLC-500 catalyst under the conditions of a weight hourly space velocity of 5h-1, a catalyst-to-oil mass ratio of 8 and a reaction temperature range of 460-540℃. Results show that 17.41% of FCC top reflux which is in diesel distillation range is cracked into gasoline fraction. Thus FCC gasoline yield can be improved. Besides, the contents of high octane number components, aromatics and C4 hydrocarbons in liquid products are increased. The aromatics in the product can be more than 50%. More than 75% aromatic hydrocarbons in the product come from alkyl-benzene cracking of FCC top reflux. Optimal reaction models for each component of hydrocarbons in FCC top reflux were also proposed.