FCC汽油催化裂解反应的实验考察

INVESTIGATION ON THE CATALYTIC CRACKING REACTIONS OF FCC NAPHTHA UPGRADING

采用微反-色谱联合的方法,考察了反应温度、反应时间及催化剂活性对哈尔滨炼油厂流化催化裂化汽油催化裂解的产品分布、低碳烯烃(乙烯、丙烯和丁烯)产率和产品汽油族组成的影响。结果表明,在反应温度590℃、剂油比170、反应时间0.24s的实验条件下,FCC汽油经催化改质后,烯烃含量大幅度下降,可由改质前的41.6%降到改质后的13.4%,满足汽油新标准的要求,而异构烷烃和芳烃含量有较大幅度增加,分别由改质前的33.3%、13.3%增到40.4%、35.7%,使汽油在降低烯烃含量的同时,辛烷值不会降低,并且还会增加低碳烯烃的产率。此外,提高反应温度、延长反应时间、提高催化剂活性均有利于降低改质汽油的烯烃含量,增产低碳烯烃。

The effect of reaction temperature, reaction time and catalyst activity on product distributions, yields of light olefins （including ethylene, propylene and butylenes） and group compositions of upgraded FCC naphtha were investigated by using an integrated micro-reactor and gas chromatograph device to catalytic upgrade FCC naphtha from Haerbin Refinery. Test results showed that under the conditions of a reaction temperature of 590 ~C, a catalyst/oil ratio of 170 and a reaction time of 0.24 s, the olefin content of upgraded naphtha was decreased from 41.6% to 13.4%, meeting the requirement of new gasoline standard, while isoalkane and aromatics contents were increased from 33.3% and 13.3% to 40.4% and 35.7%, respectively. Thus, the octane number of gasoline should not be reduced; meanwhile, the yields of light olefins were enhanced. In addition, higher reaction temperature, longer reaction time and higher catalyst activity could benefit the decrease of olefin content in naphtha and the increase of light olefin yields.