Start-up method of reaction-regeneration device for preparing low-carbon olefins from methanol

Abstract

The invention provides a start-up method of a reaction-regeneration device for preparing low-carbon olefins from methanol, mainly solving the problems of long start-up period, severe degree of catalyst damage, and easy blockage of regeneration inclined pipe in the prior art. The method disclosed herein comprises the following steps: (a) letting heated air enter into the reaction-regeneration device to heat a reactor and a regenerator; (b) transferring a catalyst into the regenerator, and spraying burning oil into the regenerator to keep the temperature of the regenerator; (c) introducing steam heated by an auxiliary oven into the reactor, and introducing back-flushing gas into the reactor through a pipeline 10 in front of a slide valve 27, and transferring the catalyst in the regenerator into the reactor; (d) establishing a catalyst circulation between the reactor and the regenerator; (e) introducing raw materials into the reactor to generate a product and form carbon deposit on the catalyst; (f) stopping using the auxiliary oven, and stopping spraying the burning oil into the regenerator; and (g) stopping an auxiliary combustion chamber. The method disclosed herein well solves the problems and can be used in the industrial production of low-carbon olefins.

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

[0007] The invention provides a new start-up method of methanol-to-light olefins reaction-regeneration unit, which mainly solves the problems of long start-up period, serious damage to the catalyst and easy blockage of the inclined pipe to be produced in the prior art.

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