Based on the analysis on composition characteristics of coker gasoline,coker gasoline cracking experiments over zeolite catalyst were conducted in a laboratory fixed fluidized bed reactor. The main influence factors on reaction conversion,yields and selectivities of light olefins of coker gasoline cracking were studied. The results indicated that the conversion of coker gasoline is low under the crack-ing reaction conditions. Increasing reaction temperature is one of the effective ways to promote the yields of light olefins;however,the selectivity of the target products changes little. The yields and selectivities of ethylene and propylene can be enhanced simultaneously by employing a new high selectivity catalyst along with lower butylene yield. The conversion degree of alkanes in coker gasoline,especially for C5-C7,is lower due to the fact that β-scission is not easy to occur for cabonium ion with less than 7 carbon atoms.%分析了典型焦化汽油的烃类组成特点,重点研究了焦化汽油催化裂解反应过程中影响反应转化率以及低碳烯烃产率和选择性的主要因素.结果表明:催化裂解反应条件下焦化汽油转化率较低,提高反应温度是提高低碳烯烃产率的有效手段,但是目标产物的选择性变化不大;采用高选择性的催化剂可以在提高乙烯和丙烯产率的同时提高其选择性,并达到少产丁烯的目的;焦化汽油的正构烷烃转化程度较低,尤其是C5～C7正构烷烃,这是因其分子碳链短,所形成的正碳离子的β断裂反应不易发生所致.
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