Catalytic cracking process to reduce dry gas and coke yield

Abstract

The disclosure relates to a catalytic cracking method for reducing the yield of dry gas and coke, the method comprising: making heavy hydrocarbon oil feedstock undergo a first catalytic reaction in a first reactor to obtain a first carbon-deposited catalyst and a first product; Light hydrocarbons are subjected to a second catalytic reaction in the second reactor to obtain a second carbon deposit catalyst and a second product; the stripped second carbon deposit catalyst and the first part of the stripped first product are The carbon catalyst is introduced into the oxygen-containing fluidized zone of the regenerator for aerobic regeneration; the second part of the stripped first carbon-deposited catalyst is introduced into the anaerobic fluidized zone of the regenerator for anaerobic regeneration at 600-800°C. The disclosure overcomes the key problem that the polycyclic aromatic hydrocarbons in the carbon deposit participate in the hydrogen transfer reaction and hinder the cracking reaction of light hydrocarbons when the carbon deposit catalyst directly reacts with light hydrocarbon oil in the prior art, and can be used in the catalytic conversion of heavy hydrocarbon oil Medium and high yields of low-carbon olefins, while yields of dry gas and coke are lower.

Description

technical field [0001] The present disclosure relates to a catalytic cracking process with reduced dry gas and coke yields. Background technique [0002] Modern petroleum processing technology pays more attention to reducing energy consumption per unit of raw material processing and reducing carbon emissions while pursuing the yield of high-value products (such as ethylene, propylene, and C8 aromatics). Hydrogen, methane, and coke, which are by-products of petroleum hydrocarbon processing in modern refineries, are often disposed of through combustion, which is the main source of carbon emissions in refineries, which greatly reduces the economics of atomic processing. [0003] Patent CN102071054A discloses a catalytic cracking method, which includes contacting the heavy feedstock with a catalyst containing a type-selective zeolite with an average pore size less than 0.7nm in the first riser reactor for cracking reaction, and the light feedstock and cracked heavy oil in the se...

AI Technical Summary

Problems solved by technology

Therefore, there is a problem in the prior art that a large amount of coke and dry gas are repeatedly produced when light hydrocarbons contact with the catalyst during the recycling process of the catalyst between the regenerator and the reactor.

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