Catalytic conversion method for improving product distribution

Abstract

The invention discloses a catalytic conversion method for improving product distribution. The method comprises the following steps of: allowing high-quality raw oil and a thermally regenerative catalyst with lower activity and coarse size distribution to contact on the lower part of a reactor to undergo cracking reaction, performing selective hydrogen transfer reaction and isomerization reaction on the generated oil gas and a carbon-containing catalyst in upstream under a certain reaction environment, separating reaction products, and stripping and regenerating spent catalysts for recycle. By the method, under the condition that the isobutene content in the liquefied gas and the olefin content in gasoline group composition are increased, the dry gas yield and coke are obviously reduced; and the particles of the catalysts are more uniform, so the local temperature distribution is more uniform in the regenerating process, and the breaking tendency of the catalysts is correspondingly reduced.

Description

technical field [0001] This invention pertains to a process for the catalytic conversion of petroleum hydrocarbons in the absence of hydrogen, and more particularly to a process for the catalytic conversion of improved product distribution. Background technique [0002] The conventional catalytic cracking process is mainly used to produce gasoline, and the gasoline yield is as high as 50% by weight. In the early 1980s, unleaded gasoline forced the development of catalytic cracking technology to produce high-octane gasoline. For this reason, the process conditions and catalyst types of catalytic cracking have undergone great changes. In terms of technology, it is mainly to increase the reaction temperature, shorten the reaction time, increase the severity of the reaction, inhibit the hydrogen transfer reaction and overcracking reaction, and improve the contact efficiency between oil gas and catalyst at the bottom of the riser; in terms of catalyst, the USY type zeolite combin...

AI Technical Summary

Problems solved by technology

It has been found through research that although these fine-particle catalysts have high cracking capacity, they have poor selectivity to dry gas and coke, and the catalyst is more likely to be broken during the regeneration process. Therefore, optimizing the sieve composition of the catalyst can improve the cracking performance. Selectivity of gas and coke, and increase the service life of the catalyst

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