Catalytic conversion method and device for prolific low-carbon olefins

Abstract

The catalytic conversion method and device for producing more low-carbon olefins, including: catalytic cracking feedstock and catalyst from the regenerator are contacted and reacted in the first riser reactor, and the reacted oil mixture is introduced into the first fluidized bed reactor to continue the reaction , the heavy raw material is introduced into the bottom of the second riser reactor, and reacts with the catalyst from the regenerator, and then the catalyst rich in MFI structure molecular sieve and β-type molecular sieve, and the C4 hydrocarbon fraction are introduced into the second riser reactor in sequence, light gasoline The fraction is introduced into the second fluidized bed reactor to continue to react with the oil mixture from the second riser reactor, and the reacted oil mixture is introduced to the first fluidized bed reactor to continue the reaction, and / or the catalyst is introduced into the stripper Carry out steam stripping; Introduce the catalyst rich in Y-type molecular sieves in the described regenerator. The method of the invention can significantly increase the yield of ethylene and propylene.

Description

technical field [0001] The invention relates to a catalytic conversion method and device for prolific production of low-carbon olefins. Background technique [0002] In recent years, with the continuous development of the chemical industry, the demand for low-carbon olefins such as ethylene and propylene has shown a rapid growth trend, and there is a large gap in the low-carbon olefins market. At present, the methods for producing low-carbon olefins mainly include steam cracking technology, catalytic cracking technology, propane dehydrogenation to propylene technology, and coal-to-methanol to olefins technology. Among them, steam cracking technology is the main source of low-carbon olefins. The ethylene produced by it accounts for more than 95% of the total ethylene output, propylene accounts for about 61% of the total propylene output, and the propylene produced by catalytic cracking technology accounts for about 34% of the total propylene output. . As steam cracking adop...

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Problems solved by technology

[0008] The above technologies promote the conversion of heavy hydrocarbon feedstocks and the selectivity of low-carbon olefins by adjusting the catalyst formulation and adopting a combined reactor form combining a riser and a fluidized bed, but there is no coupling between catalysts of different formulations and feedstock oils of different properties optimization, the yield of ethylene and propylene needs to be further improved

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