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

Abstract

The invention relates to a catalytic conversion method and a device for productive low-carbon olefin, and the method comprises the steps: carrying out the contact reaction of a first hydrocarbon raw material and a catalyst from a regenerator in a first riser reactor, and carrying out the contact reaction of a heavy hydrocarbon raw material, a second hydrocarbon raw material and a catalyst from a regenerator in a second riser reactor, introducing the reacted oil mixture into the fluidized bed reactor for continuous reaction, sequentially performing contact reaction on a third hydrocarbon raw material and a catalyst from a regenerator in a first reaction zone and a second reaction zone of a third riser reactor, separating the reacted oil mixture through a separation device, and introducing the catalyst into a stripper for stripping; introducing heavy hydrocarbons into the bottom of the second riser reactor, and selecting the third hydrocarbon raw material from distillate oil with the distillation range of 180-360 DEG C, preferably distillate oil with the distillation range of 200-340 DEG C. 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

[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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