Catalytic conversion method and device for prolific production of low-carbon olefins

Abstract

A catalytic conversion method and device for prolific production of low-carbon olefins, comprising: the first hydrocarbon feedstock and the catalyst from the regenerator are contacted and reacted in the first riser reactor, and the heavy hydrocarbon feedstock, the second hydrocarbon feedstock and the The catalyst from the regenerator is contacted and reacted in the second riser reactor, and the reacted oil mixture is introduced into the fluidized bed reactor to continue the reaction. The contact reaction is carried out in the first reaction zone and the second reaction zone, and the reacted oil mixture is separated by the separation device, and the catalyst is introduced into the stripper for stripping. Heavy hydrocarbons are introduced into the bottom of the second riser reactor, and the third hydrocarbon feedstock is selected from distillate oils with a distillation range of 180°C to 360°C, preferably distillate oils with a distillation range of 200°C to 340°C. 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

[0009] 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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