催化材料对加氢裂化尾油催化裂解异构化反应的影响

EFFECTS OF CATALYTIC MATERIALS ON ISOMERIZATION OF HYDROCRACKING TAIL OIL IN DEEP CATALYTIC CRACKING PROCESS

利用小型固定流化床催化裂化试验装置,研究了ZSP分子筛催化剂、Y分子筛催化剂及其混合体系对加氢裂化尾油催化裂解产物分布的影响,探究了不同催化材料对催化裂解过程中异构化反应的作用,以及对催化裂解过程中裂化、芳构化、氢转移反应的影响。提出以汽油馏分产物组成表征催化裂解产物异构化程度的异构化指数ISOI。结果表明:随着催化剂中择形分子筛比例增加,催化裂解过程中异构化反应程度降低,裂化反应程度增加,氢转移反应程度降低,芳构化反应程度降低;采用100%ZSP分子筛催化剂时,加氢裂化尾油产物中裂化气异构化指数B_(G1)为1.13,汽油异构化指数ISOI为0.83,异构烃类产率降至29.45%,乙烯的单程产率可达7.22%,丙烯的单程产率可达23.66%;相比于Y分子筛,ZSP分子筛有助于降低加氢裂化尾油催化裂解过程中异构化产物的产率,增产低碳烯烃。

The effects of ZSP zeolite catalyst,Y zeolite catalyst and their mixture system on the product distribution in deep catalytic cracking(DCC)process of hydrocracking tail oil(HTO)were investigated in a fixed fluidized bed reactor,and the effects of different catalytic materials on the isomerization during catalytic cracking and on the cracking,aromatization and hydrogen transfer reaction during DCC process were explored.The isomerization index(ISOI)was proposed to characterize the isomerization degree of catalytic cracking products by the composition of gasoline distillates.The results showed that the degree of isomerization,the degree of cracking,the degree of hydrogen transfer reaction and the degree of aromatization decreased with the increase of the proportion of ZSP zeolite in the catalyst system,the isomerization index(B_(G1))of cracking gas in HTO was 1.13,the ISOI of gasoline was 0.83,the yield of isomerized hydrocarbons was 29.45%,the yield of ethylene was 7.22%,and the yield of propylene was 23.66%.Compared with Y zeolite,ZSP zeolite could reduce the yield of isomerization products and increase the yield of light olefins in the DCC of HTO.