Method for preparing ethylene and propone with oxocompound

Abstract

The invention relates to a method for producing ethylene and propylene by an oxygen compound, which mainly solves the problems of low ethylene and propylene yield, difficult control to the coke burning degree of a regenerator and hard guarantee of the average activity level of a catalyst in a reactor of the prior art. The invention properly solves the problems by adopting the technical proposals that: at least one of methanol and dimethyl enther is taken as a raw material, at least one of water, C2-C5 alcohol,C2-C5 ether, a C4 above hydrocarbon type or C6-C12 arene is selected as a terminator, and the method comprises the following steps that: a) the material firstly enters a reaction zone from the bottom part of a fluidized bed reactor and contacts with a catalyst to generate a stream 1 containing ethylene and propylene; b) the stream 1 contacts with the terminator at the bottom part of a gas-solid rapid separation zone at the upper part of the reaction zone of the fluidized bed reactor to generate an effluent 2 containing ethylene and propylene; c) a gas phase containing ethylene and propylene is discharged from the top part of the reactor after the effluent 2 passes the stream 2 undergoing the gas-solid rapid separation and then is separated by a cyclone separator, and the catalyst under regeneration enters a stripper and then enters the bottom part of a regenerator; and d) the catalyst under regeneration returns to the reaction zone at the lower part of the reactor after the regeneration by the regenerator and the steam stripping by the stripper; wherein the regenerator is a riser, and the method of preparation can be used for the industrial production of ethylene and propylene.

Description

technical field [0001] The invention relates to a method for producing ethylene and propylene from oxygen-containing compounds. Background technique [0002] Ethylene and propylene are two important basic chemical raw materials, and their demand is constantly 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 low-carbon olefins is oxygenated compounds, 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, biom...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the yield of ethylene and propylene is low in the prior art, the regeneration degree of the catalyst in the regenerator is difficult to control, and the average carbon deposition level of the catalyst in the reactor is not guaranteed. A kind of New Oxygenated Process for Producing Ethylene and Propylene

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