Research progress of heavy oil deep catalytic cracking under "Double Carbon" policy.

The research progress of heavy oil catalytic cracking technology at home and abroad is summarized from three aspects: the research survey of reaction mechanism of heavy oil catalytic cracking, the analysis and comparison of molecular sieve catalytic materials for heavy oil catalytic cracking, the technical characteristics and industrial application of different heavy oil catalytic cracking processes. Firstly, modified molecular sieve catalyst materials, small-crystal molecular sieves, hierarchical pore molecular sieves have become hot spots in current research and application, so as to strengthen the hydrothermal stability of catalyst, the intracrystalline diffusion and the graded cracking of heavy oil macromolecules in the hierarchical pores of the heavy oil catalytic cracking catalyst; secondly, based on the research of the carbonium ion mechanism and the free radical mechanism of the catalytic cracking reaction and the like, the reaction severity of heavy oil catalytic cracking technologies such as DCC, CPP, HCC, RTC and HSFCC is continuously improved, and in order to match the optimal reaction environment for different feeds, new reactor or multi-reactor combination technology has become the main direction of process technology research, which has achieved the purpose of improving the yield and selectivity of light olefins. [ABSTRACT FROM AUTHOR]