二苯并噻吩在催化裂化过程中的转化规律研究

在小型固定流化床（FFB）装置上以二苯并噻吩（DBT）-十六烷体系为原料，研究DBT在催化裂化过程中的转化规律。结果表明，在反应温度500 ℃、剂油质量比6、空速10 h-1的条件下，DBT的转化率为45%左右。在DBT参与的反应中，烷基化反应占主要地位。DBT转化为甲基苯并噻吩的比例最高，其次为C2～C5的烷基二苯并噻吩。DBT-十六烷反应体系的硫90%左右分布在催化裂化液体产品中，少量反应生成硫化氢，少量进入焦炭中。DBT的加入降低了十六烷的转化率，促使干气生成，汽油产率减少，柴油产率增加，焦炭产率显著增加。

STUDY ON THE TRANSFORMATION OF DIBENZOTHIOPHENE IN FCC PROCESS

The transformation mechanism of dibenzothiophene(DBT) in FCC process was studied on a fixed fluidized bed unit in laboratory using DBT containing hexadecane as feed.Test results showed that under the conditions of a reaction temperature of 500 ℃,a catalyst to oil mass ratio of 6 and a space velocity of 10 h-1,the conversion of DBT was about 45%.Alkylation reactions were the main reactions in which DBT took place.The main product was methtyl-benzothiophene and followed by C2—C5 alkyl-DBT.Nearly 90 percentage of the sulfur in the DBT-hexadecane reaction system was distributed in the liquid products,only a small portion was converted to H2S and coke.The presence of DBT reduced the conversion of hexadecane,the yield of gasoline fractions decreased,the yields of dry gas,diesel fractions and coke increased.