Catalytic cracking method and equipment for producing more propylene

Abstract

A catalytic cracking process and apparatus for preparing propene with high output features that two reactors are used to implement three-stage reaction. The raw oil is catalytically cracked in the 1st reactor. The 2nd reactor is used by the circulated oil and gasoline. The gasoline comes in the reactor from its lower part, where the gasoline is in contact with catalyst and then takes part in the reaction at 550 deg.C. Said circulated oil is cracked at upper part and lower temp. When the heat provided by gasoline resultant is higher than that needed by circulated oil reaction, the part of used catalyst is tapped back into the life segment of raw oil reactor.

Description

technical field [0001] The invention belongs to the technical field of catalytic conversion of petroleum hydrocarbons, in particular to a catalytic conversion method capable of increasing catalytic cracking yield and improving gasoline quality. Background technique [0002] Catalytic cracking is an important secondary processing method for petroleum heavy fractions. Especially in China, about 80% of gasoline comes from catalytic cracking units. How to increase the product yield of catalytic cracking unit, improve product distribution and quality is very important. The conventional catalytic cracking method uses a riser reactor, and the circulating oil enters the raw oil (atmospheric heavy oil, vacuum wax oil, coker wax oil, vacuum press oil and other catalytic feeds, the same below) riser reactor reaction. Cycle oil is easier to gasify and be adsorbed by the catalyst than fresh raw oil, which will quickly deactivate the active center of the catalyst and affect the cracking...

AI Technical Summary

Problems solved by technology

[0006] These inventions are obviously quite complex and difficult to implement in engineering

During the reaction process of gasoline and circulating oil, due to the high temperature of the catalyst, it will be converted into more dry gas and coke, r

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