Abstract: Based on the innovations of both catalytic materials and reaction engineering of diameter-transformed fluidized bed reactor, the highly selective catalytic cracking process from heavy hydrocarbon to olefins was proposed, and industrial test was carried out, which was aimed at the improvement of the yield and the selectivity of light olefin products. The industrial results were consistent with those of laboratory results, and the selectivity of olefin products was greatly improved. The successful industrialization proved the feasibility and effectiveness of the diameter-transformed fluidized catalytic cracking technology by using mesoporous zeolites catalyst, which could provide technical support for the smooth transformation from oil refining to chemicals. At the same time, it lays a reliable theoretical foundation and accumulates rich industrial practice for the in-depth development of targeted catalytic cracking.

Key words: light olefins, selectivity, heavy hydrocarbon, mesoporous zeolites, targeted catalytic cracking