Catalytic conversion method and catalytic conversion device for productive low-carbon olefin

Abstract

The catalytic conversion method comprises the following steps: a catalytic cracking raw material and a catalyst from a regenerator are subjected to a contact reaction in a first riser reactor, an oil agent mixture after the reaction is introduced into a first fluidized bed reactor for continuous reaction, and a heavy raw material is introduced into the bottom of a second riser reactor for continuous reaction, and is subjected to contact reaction with a catalyst from the regenerator; then, the catalyst rich in the MFI structure molecular sieve and the beta-type molecular sieve and C4 hydrocarbon fractions are sequentially introduced into a second riser reactor, and light gasoline fractions are introduced into a second fluidized bed reactor and continuously reacted with an oil mixture from the second riser reactor; the reacted oil mixture is introduced into a first fluidized bed reactor for continuous reaction, and / or a catalyst is introduced into a stripper for stripping; and a catalyst rich in a Y-type molecular sieve is introduced into the regenerator. The method provided by the invention can obviously improve the yields 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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