噻吩类硫化物在催化裂化过程中转化规律的研究

采用固定流化床实验装置，以噻吩、2-丁基噻吩和苯并噻吩为模型化合物，研究了不同结构的噻吩类硫化物在催化裂化条件下的反应特性和产物硫分布规律。结果表明：噻吩和苯并噻吩的转化率均较低（小于20%），产物主要分布在焦炭和液体中，很难发生裂化脱硫反应；2-丁基噻吩具有较高的反应活性，主要发生脱烷基、侧链裂化和裂化脱硫反应，气体硫的选择性达到28%左右。对于Y型分子筛催化剂，噻吩类硫化物的产物收率和硫分布选择性均与转化率呈很好的线性关系。

RESEARCH ON THE CONVERSION OF THIOPHENE DERIVATIVES UNDER CATALYTIC CRACKING CONDITIONS

Reaction performances of thiophene, 2-butylthiophene and benzothiophene were investigated by a FFB device under catalytic cracking conditions, and their reaction mechanisms and product sulfur distributions were discussed in detail. Results showed that the conversion of thiophene and benzothiophene were rather low (less than 20%), cracking to H2S was hard to happen in this case, thereby high selectivity of coke and liquid product was observed. As to 2-butylthiophene, it was quite active under catalytic cracking conditions, reactions including dealkylation, cracking of side chain and desulfurization took place mainly; in reaction product, sulfur distributed in gas reached 28%. With zeolite Y catalysts, good linear relationships existed in product yield-conversion, product sulfur distribution-conversion for thiophene species.