Low-carbon olefin production method

Abstract

The invention relates to the field of low-carbon olefin production, and discloses a low-carbon olefin production method, which comprises: introducing a heavy raw material oil into a first cracking reaction zone, and carrying out a reaction; introducing a light raw material oil and the stream from the first cracking reaction zone into a second cracking reaction zone, and carrying out a reaction toobtain a carbon depositing contact agent; carrying out charring treatment on the carbon depositing catalyst to obtain a regeneration agent; and directly introducing part of the regeneration agent intothe second cracking reaction zone to participate in a cracking reaction, and introducing the remaining regeneration agent into the first cracking reaction zone to participate in the cracking reactionafter heat exchange, wherein a weight ratio of the regeneration agent introduced into the first cracking reaction zone to the regeneration agent introduced into the second cracking reaction zone is 1:(1-8). According to the present invention, with the method, under the premise of the low energy consumption, the main production of ethylene and the by-production of propylene and triphenylarene fromthe raw material-containing heavy oil in a high olefin yield and low coke yield manner can be ensured.

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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