Catalytic conversion method capable of improving product distribution

Abstract

The invention discloses a catalytic conversion method capable of improving product distribution. The catalytic conversion method capable of improving product distribution is characterized in that high-quality raw oil and a hot-regenerated catalyst having low mean activity, relatively uniform activity distribution and wide particle size distribution contact with each other in a lower part of a reactor and undergo a cracking reaction to produce oil gas and a carbon-containing catalyst; the oil gas and the carbon-containing catalyst are fed upstream and undergo a selective hydrogen transfer reaction and an isomerization reaction under certain reaction conditions; and the reaction products are separated and the catalyst needing to be regenerated is subjected to steam stripping and regeneration and then is recycled. The catalytic conversion method provided by the invention can improve product distribution and reduce dry gas and coke yields. Through the catalytic conversion method capable of improving product distribution, catalyst particles have uniform sizes; local temperature distribution in regeneration is uniform; and catalyst fragmentation is reduced relatively.

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

Images