FCC轻汽油催化裂化生产丙烯反应规律的研究  

Studies on reaction rules for catalytic conversion of FCC light gasoline to propylene

作　　者：李晓红[1] 沙有鑫[1] 李春义[1] 张建芳[1] 杨朝合[1] 山红红[1] 

机构地区：[1]中国石油大学(华东)重质油国家重点实验室,山东东营257061

出　　处：《燃料化学学报》2007年第2期181-187,共7页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(20490200)

摘　　要：在提升管实验装置和脉冲色谱装置上,采用ZSM-5催化剂,考察了不同条件下FCC轻汽油和2M-1-C=5的裂化。结果表明,催化裂化过程添加ZSM-5催化剂可提高汽油中C=5、C=6的质量分数。轻汽油裂化生产丙烯的性能优于重汽油和全馏分汽油,在相对低的温度下瞬时反应能得到较高的丙烯收率。在脉冲色谱装置上,反应温度和载气流量对轻汽油和2M-1-C=5裂化生产丙烯的影响一致,即反应温度升高,载气流量降低,丙烯收率增加。提高反应温度,延长停留时间可以提高丙烯对丁烯的比例。轻汽油在ZSM-5催化剂上反应,催化剂结焦失活速度开始较快,后来减缓。ZSM-5催化剂结焦失活对丙烯生成的抑制作用大于对丁烯的抑制作用,ZSM5-的强酸中心多则更有利于生成丙烯。FCC light gasoline containing great lot olefins is a kind of good catalytic cracking feedstock for propylene production. A series of experiments about catalytic cracking of light gasoline and 2M-1-C5^n were carried out with the ZSM-5 catalyst under different conditions on the riser experimental unit and the subminiature reactorchromatograph united apparatus. Results show that the contents of C5^n and C6^n in FCC gasoline can be enhanced via using the ZSM-5 catalyst in catalytic cracking. Light gasoline is more suitable for producing propylene than heavy gasoline or full fraction gasoline. High propylene yield can be obtained from light gasoline even when reaction temperature is low and the contact time is only several milliseconds. The effects of temperature and flow velocity .of N2 on propylene yields of cracking light gasoline and 2M-1-C5^n are nearly the same, namely propylene yield increases when temperature increases or flow velocity of N2 decreases. The ratio of propylene to butenes can rise via increasing temperature and prolonging contact time. The coking rate of the ZSM-5 catalyst is rapid at beginning and afterwards slow gradually. There is a greater influence of the coking of ZSM-5 catalyst on propylene yield than on butenes yield. It is beneficial to increase propylene yield when there are more strong sites on ZSM-5 zeolite.

关 键 词：FCC轻汽油 异己烯 催化裂化 丙烯 ZSM-5 

分 类 号：TE624.4[石油与天然气工程—油气加工工程]