FCC汽油催化裂化降烯烃反应规律的考察

采用微反-色谱联合的方法,考察了反应温度、反应时间及剂油质量比对原料油催化改质的产品分 布、低碳烯烃(乙烯、丙烯和丁烯)产率和改质汽油族组成的影响。结果表明,原料油经催化改质后,烯烃质量分数大 幅度下降,由原料中的42.6%降至13.4%,满足汽油新标准的要求,而异构烷烃和芳烃质量分数有较大幅度增加,分 别由原料中的28.4%、18.2%增至40.4%、35.7%,可以预测FCC汽油在降低烯烃质量分数的同时,辛烷值不会降低, 并且还会增加低碳烯烃的产率,可达25%左右。此外,提高反应温度、延长反应时间、增加剂油质量比均有利于降低 改质汽油的烯烃质量分数,增产低碳烯烃。

Investigation on Olefin-Decrement Reaction Rule of FCC Gasoline by Catalytic Cracking

The effects of reaction temperature,reaction time and mass ratio of catalyst to oil on product distribution,yields of light olefins(including ethylene,propylene and butylene),and group composition of gasoline upgraded were investigated by using micro-reactor and gas chromatograph integrated method in catalytic reformulating.The experimental results show that olefin content in gasoline decreases from 42.6% in raw material to nearly 13.4%,which is met with the requirements of new gasoline standard.The contents of iso-alkane and aromatics are markedly increased from 28.4% and 18.2% to 40.4% and 35.7%,respectively,while the octane number of gasoline is not reduced.Meanwhile,higher yields of light olefins(25%)are also obtained after FCC gasoline being reformulated under laboratory conditions.In addition,higher reaction temperature,longer reaction time,and higher mass ratio of catalyst to oil are beneficial to decrease olefin content of FCC gasoline and increase the yields of light olefins.