Catalytic cracking method of increasing gasoline yield

Abstract

The invention discloses a catalytic cracking method of increasing gasoline yield, which comprises the following steps: (A) feeding raw material oil to the lower part of a first lifting tube reactor and carrying out a contact reaction to the raw material oil with a catalyst from a pre-lifting mixer; (B) feeding a to-be-regenerated catalyst from the first lifting tube reactor into a steam stripping part of a main precipitator, performing steam stripping and regenerating the catalyst in a regenerator; (C) feeding catalytic diesel or hydrotreated catalytic diesel into the lower part of a second lifting tube reactor and carrying out a contact reaction with the catalyst from the regenerator; (D) feeding the to-be-regenerated catalyst from the second lifting tube reactor into a steam stripping part of a sub precipitator; (E) performing air stripping to the to-be-regenerated catalyst from the steam stripping part of the sub precipitator, feeding one part of the catalyst into the regenerator and regenerating the catalyst, and feeding the other one part of the catalyst into the pre-lifting mixer and mixing the catalyst with the regenerated catalyst from the regenerator; and (F) feeding the mixed catalyst into the lower part of the first lifting tube reactor and carrying out a contact reaction with the raw material oil. By means of the method, the catalytic cracking device is increased by 3-20% in gasoline yield, is increased by more than 0.5 units in RON of gasoline and is reduced in the content of olefin by more than 3% by volume. The gasoline directly produced in the second lifting tube reactor is higher than 96 in RON and is less than 10% in the content of olefin.

Description

Technical field [0001] The present 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 producing more gasoline. Background technique [0002] Catalytic cracking unit is an important secondary processing unit in the oil refining industry, as well as the main processing unit for the production of automotive gasoline. At present, more than 65% of the domestic automotive gasoline blending components are catalytically cracked gasoline. Gasoline olefin content requirements and strong market demand for propylene have given rise to various catalytic cracking processes that reduce gasoline olefin content and increase propylene production. However, while achieving these goals, the gasoline yield of catalytic cracking units has gradually reduce. [0003] With the enrichment of domestic oil refining and processing methods and the changes in market demand, on the one hand, the proportion...

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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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