Regeneration method for preparing light olefins catalyst from oxygen-containing compounds

Abstract

The invention relates to a method for regenerating a catalyst for preparing low-carbon olefin from an oxygen-containing compound, which mainly solves the problem that the temperature of a regenerator is difficult to control in the prior art. The method adopts a technical proposal which comprises the following steps: putting a regenerating medium of which the temperature is between 100 and 300 DEG C into a regeneration dense phase zone of a fluidized bed regenerator to be contacted with a catalyst which is to be regenerated and contains an aluminosilicophosphate molecular sieve with 0.5 to 7.5 weight percent of coke, performing an oxidation reaction on the mixture at a regeneration temperature of between 600 and 700 DEG C to generate large amount of heat while generating a gas phase material flow which contains O2, CO, and CO2, and delivering removing the heat out of the regeneration dense phase zone through an external heat-removing device of the regenerator, wherein the external heat-removing device of the regenerator is a full back mixing type external heat-removing device, and the distance between the connecting position of the external heat-removing device of the regenerator and the regeneration dense phase zone and a feed distributor for bottom regeneration media is less than or equal to 0.5 of the height of a bed layer in the regeneration dense phase zone. The technical proposal better solves the problem and can be used for the industrial production of the low-carbon olefin.

Description

technical field [0001] The invention relates to a regeneration method for preparing low-carbon olefin catalysts from oxygen-containing compounds. Background technique [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 technical problem to be solved by the present invention is the problem of relatively large regenerator temperature fluctuations in the prior art, and a new regeneration method for preparing low-carbon olefin catalysts from oxygen-containing compounds is provided

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