催化裂化汽油的二次反应

从降烯烃、降硫和增产丙烯的现实需要出发，分析了FCC汽油二次反应中的理想和非理想反应.用小型提升管催化裂化实验装置考察了FCC粗汽油在REUSY、ZRP和MO-REY沸石催化剂上二次反应的产品分布和改质汽油组成;探讨了操作强度对二次反应转化率和选择性的影响.结果表明：在Y型或ZRP沸石催化剂作用下，FCC汽油二次反应不仅产生更轻的干气和富含丙烯的液化气，也产生更重的柴油和焦炭.二次反应得到的改质汽油与原料汽油相比，其烯烃含量和硫含量降低，芳烃含量和辛烷值明显提高.二次反应的转化深度和选择性取决于原料汽油的烯烃含量、催化剂沸石类型和操作强度.

Secondary reactions of catalytically cracked gasoline

The ideal reactions and non-ideal reactions for reducing gasoline olefin and sulfur, and increasing propylene were proposed by analyzing potential secondary reactions of catalytically cracked gasoline. The secondary reactions of FCC nathpha on REUSY, ZRP and MO-REY zeolite catalysts were investigated in a FCC pilot plant with riser reactor to determine the product distribution of secondary reactions and properties of the upgraded gasoline. Effects of operating intensity on conversion and selectivity of gasoline secondary reactions were also investigated by experiments.The results indicated that lighter dry gas,LPG rich in propylene,heavier diesel and coke were produced by secondary reactions of FCC nathpha under the catalysis of Y or ZRP zeolite catalysts. In comparison with the FCC nathpha feeds, olefinicity and sulfur content of the upgraded gasoline derived from secondary reactions decreased greatly, and aromatics content and octane number increased evidently.Conversion and selectivity of gasoline secondary reactions depended on the olefin content of feed gasoline, the zeolite type of catalysts and the operating intensity of reaction process.