Starting method of reaction-regenerative device for preparing low carbon olefin form methanol

Abstract

The invention relates to a starting method for a reaction-regeneration device which uses methanol to prepare low-carbon olefin, mainly comprising the following steps: a. using an auxiliary combustion chamber to heat air, and then entering the reaction-regeneration device; heating the dense phase temperature of a regenerator to 400-600 DEG C, and heating the temperature of a reactor reaction zone to 150-350 DEG C; b. switching the catalyst from a catalyst storage tank into the regenerator, and injecting the combustion oil to maintain the temperature of the regenerator; c. switching the catalyst from the regenerator into the reactor, and establishing reaction catalyst circulation between the reactor and the regenerator; d. heating the reactor reaction zone to a temperature not less than 350 DEG C, and putting the raw materials containing the methanol in the reactor to contact with the catalyst so as to generate the products containing low-carbon olefin and also form a carbon deposit on the catalyst; e. stop injecting combustion oil to the regenerator; f. stop using the auxiliary combustion chamber. The method has short starting period and light catalyst damage degree, which can be used for low-carbon olefin industrial production.

Description

technical field [0001] The invention relates to a start-up method of a reaction-regeneration device for producing methanol to low-carbon olefins. technical background [0002] Low-carbon olefins, namely ethylene and propylene, are two important basic chemical raw materials, and their demand is increasing. Generally, ethylene and propylene are produced through petroleum routes, but due to the limited supply and high price of petroleum resources, the cost of producing ethylene and propylene from petroleum resources continues to increase. In recent years, people have begun to vigorously develop the technology of converting alternative raw materials into ethylene and propylene. Among them, an important class of alternative raw materials for the production of light olefins are oxygenates, such as alcohols (methanol, ethanol), ethers (dimethyl ether, methyl ethyl ether), esters (dimethyl carbonate, methyl formate Esters), etc., these oxygenated compounds can be converted from co...

AI Technical Summary

Problems solved by technology

[0006] The methanol-to-light olefin reaction-regeneration olefin is essentially different from the traditional catalytic cracking reaction-regeneration system, and the start-up difficulty is also greater than that of catalytic cracking

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