Method for producing light olefins

Abstract

The invention relates to the field of low-carbon olefin production, and discloses a method for producing low-carbon olefins. The method includes: introducing heavy raw material oil into the first cracking reaction zone for reaction; The stream in the reaction zone is introduced into the second cracking reaction zone for reaction; the carbon deposit contact agent is obtained; the carbon deposit catalyst is scorched to obtain the regeneration agent; and part of the regeneration agent is directly introduced into the second cracking reaction zone to participate in The cracking reaction, and the remaining part of the regenerant is introduced into the first cracking reaction zone after heat exchange to participate in the cracking reaction; the weight ratio of the regenerant introduced into the first cracking reaction zone and the second cracking reaction zone is 1: (1~ 8). The method for producing low-carbon olefins provided by the present invention can mainly produce ethylene from raw materials containing heavy oil with higher olefin yield and lower coke yield under the premise of ensuring lower energy consumption, while by-product propylene and triphenylaromatics.

Description

technical field [0001] The invention relates to the field of production of low-carbon olefins, in particular to a method for producing low-carbon olefins. Background technique [0002] Low-carbon olefins such as ethylene and propylene are important organic chemical raw materials. At present, the industrial production of ethylene and propylene mainly includes steam cracking and catalytic cracking. [0003] The steam cracking method uses a high-temperature method for cracking. The range of raw materials includes gaseous hydrocarbons, light oil (naphtha), kerosene, light diesel oil, and heavy diesel oil. The cracking temperature is generally 750-900°C. The reaction is carried out in a furnace tube, and the reacted product is rapidly cooled at the outlet of the furnace to terminate its reaction, and then separated by a fractionating tower to obtain cracked gas, cracked gasoline, cracked diesel and cracked tar. The yield of ethylene in the light olefins obtained by steam cracki...

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Problems solved by technology

[0012] The purpose of the present invention is to overcome the defect that the olefin yield is not high and the coke yield is relatively high in the production of ethylene-based olefin products in the prior art, and to provide an olefin yield under the premise of ensuring low energy consumption A method with higher coke yield and lower coke yield to produce mainly ethylene from raw materials containing heavy feed oil and light feed oil, with by-products of propylene and triphenylaromatics

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