Reaction device for preparing low carbon olefin from methanol or dimethyl ether

Abstract

The invention relates to a reaction device which uses methanol or dimethyl ether to prepare low-carbon olefin, mainly to solve the problem of low low-carbon olefin production rate in the prior art. The reaction device which uses methanol or dimethyl ether to prepare low-carbon olefin mainly comprises a first reaction zone 2, a second reaction zone 3, a catalyst circulation zone and a reactor separation zone 7; a material inlet 1 is arranged at the lower part of the first reaction zone 2; the upper part of the first reaction zone is connected with the second reaction zone 3; a gas-solid cyclone separator 6 is arranged inside the reactor separation zone 7; the upper part of the reactor separation zone 7 is provided with a product outlet 8; three catalyst outlets are arranged at the lower part of the reactor separation zone 7, wherein, the first catalyst outlet is connected with the first reaction zone 2 through an external circulation inclined tube 13 of the reactor; the second catalyst outlet is connected with a regenerator through a spent catalyst circulation inclined tube 9; the third catalyst outlet is connected with a heater 11 outside the reactor; the bottom part of the heater 11 outside the reactor is connected with the first reaction zone 2; the regenerated catalyst returns to the second reaction zone 3 through a regenerated catalyst circulation tube 15; a distribution board 4 is arranged at the bottom part of the second reaction zone 3; a gas-solid rapid separation equipment 5 is arranged at the upper part of the second reaction zone 3. Such a technical proposal solves all the problems and the device can be used for low-carbon olefin industrial production.

Description

technical field [0001] The invention relates to a reaction device for preparing light olefins from methanol or dimethyl ether. 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 coal, natural gas, bi...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is the low yield of low-carbon olefins in the

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