摘要
以催化裂化汽油为原料,采用中压加氢实验装置模拟S-Zorb工艺研究催化裂化汽油临氢吸附脱硫的反应规律。使用工业吸附剂考察烯烃分子在临氢吸附脱硫过程中的反应行为,结果发现,汽油中C5和C6烯烃主要发生加氢饱和反应,异构化和芳构化反应性能较差,这是导致精制后汽油辛烷值损失的主要原因。为了减少S-Zorb工艺中C5和C6烯烃加氢饱和引起的辛烷值损失,以9∶1的质量比混合工业吸附剂和实验室研制的具有异构化及芳构化性能的助催化剂,优化并获得提高汽油辛烷值的工艺条件为:反应温度为430℃、反应压力为2.4 MPa、重时空速为4 h-1、氢油摩尔比为0.30。相较工业吸附剂,精制汽油硫质量分数小于10μg/g,C5和C6烯烃减少量降低3.84%,C5和C6异构化程度提高0.71,汽油辛烷值损失减少1个单位。
Using fluid catalytic cracking(FCC)gasoline as feedings,the s-zorb process is simulated by a medium pressure hydrogenation experimental unit to study the hydro-adsorption desulfurization of FCC gasoline.The reaction performance of olefin molecules in hydro-adsorption desulfurization process is investigated by using an industrial adsorbent.It is found that C5and C6olefins in FCC gasoline mainly perform hydro-saturation reactions,and show weak in isomerization and aromatization,which is the main factor leading to octane number loss of gasoline.In order to reduce octane number loss from C5and C6olefins hydro-saturation in S-Zorb process,an industrial adsorbent is mixed in a ratio of 9∶1 with laboratory-developed co-catalyst that has good isomerization and aromatization performance.Numerical results reveal that the minimum loss of gasoline octane number can be attained under the optimum reaction conditions that the reactive temperature maintains at 430℃,the operation pressure is 2.4 MPa,weight hourly space velocity is 4 h-1and the molar ratio of hydrogen to oil is 0.30.Compared with the process over the industrial adsorbent alone,the sulfur contents of gasoline that is processed over the industrial absorbent mixed with co-catalyst is less than 10μg·g-1,the decreasing amount of C5and C6olefins in gasoline decreases by 3.84 wt%,the isomerization degree of C5and C6increases by 0.71,and the octane number loss of gasoline reduces by 1 unit.
作者
葛思达
杨欢欢
王刚
方东
韩建年
党法璐
刘梦林
GE Si-da(State Key Laboratory of Heavy Oil Processing,China University of Petroleum-Beijing,Beijing 102249,China)
出处
《现代化工》
CAS
CSCD
北大核心
2020年第3期77-81,共5页
Modern Chemical Industry
基金
国家重点研发计划(2017YFB0602504)
中国石油科技开发项目(2019A-1809-2,KYWX-19-019).
