催化裂化过程中碳四烯烃的反应和分布规律

Reaction chemistry and distribution of butylene in catalytic cracking

分析了催化裂化过程中碳四烯烃的生成和转化反应,碳四烯烃的生成主要来自烃类大分子的裂化反应以及裂化反应中产生的低碳数烯烃的二次反应,生成的碳四烯烃可进一步发生裂化反应、异构反应、二聚反应和氢转移反应。得出促进催化裂化碳正离子直接进行异构化反应,然后再进行β位断裂反应,同时抑制二聚反应和氢转移反应,有利于提高催化裂化产物中碳四烯烃的产率和选择性。在此基础上,进一步分析了催化裂化产物中碳四烯烃的分布规律,为开发多产碳四烯烃的催化裂化催化剂和工艺提供依据。

The formation and conversion chemistry of butylene in catalytic cracking were studied.The butylenes forms through the catalytic cracking of large molecular hydrocarbons and the secondary reaction of low carbon number olefins produced in the cracking reaction.The butylenes can be further converted through cracking,isomerization,dimerization and hydrogen transfer reaction.It was beneficial to improve the yield and selectivity of butylenes by enhancing isomerization of carbonium ion in catalytic cracking and controlling dimerization and hydrogen transfer reaction.The distribution of butylenes in catalytic cracking products was further analyzed.