A kind of catalytic cracking method of prolific gasoline

Abstract

The invention discloses a catalytic cracking method for producing gasoline. The steps are: the feedstock oil enters the lower part of the first riser reactor to contact and react with the catalyst from the pre-lift mixer, the raw catalyst in the first riser reactor enters the stripping section of the main settler for stripping, and then enters the regenerator for regeneration. Catalyzed diesel or hydrotreated catalytic diesel enters the lower part of the second riser reactor to contact and react with the catalyst from the regenerator, and the ungenerated catalyst in the second riser reactor enters the stripping section of the secondary settler After being stripped, part of the spent catalyst enters the regenerator for regeneration, and the other part enters the pre-lift mixer to mix with the regenerated catalyst from the regenerator, and the mixed catalyst enters the lower part of the first riser reactor to contact with the raw material oil for reaction. By using the method of the invention, the gasoline yield of the catalytic cracking unit can be increased by 3-20 percentage points, the gasoline RON can be increased by more than 0.5 units, and the gasoline olefin content can be reduced by more than 3 volume percentage points. The RON of gasoline directly produced in the second riser reactor is above 96, and the volume content of olefins is below 10%.

Description

technical field [0001] The invention belongs to the field of catalytic cracking of hydrocarbon oil in the absence of hydrogen, and particularly relates to a catalytic cracking method for prolific gasoline production. Background technique [0002] Catalytic cracking unit is an important secondary processing unit in the oil refining industry, and it is also the main processing unit for the production of motor gasoline. At present, more than 65% of the blending components of domestic motor gasoline are FCC gasoline. In recent years, due to the cleaning of gasoline, especially The requirements of gasoline olefin content and the strong market demand for propylene have led to various catalytic cracking processes to reduce gasoline olefin content and increase propylene production. reduce. [0003] With the enrichment of domestic refining and processing methods and changes in market demand, on the one hand, the proportion of hydrotreating components in the catalytic cracking feedst...

AI Technical Summary

Problems solved by technology

[0008] It can be seen from the analysis that the above process methods mainly increase the gasoline yield by increasing the ratio of agent to oil. Although the increase of gasoline yield can be realized to a certain extent, the increase in gasoline yield is very limited.

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