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Method for reducing catalyst contamination in reaction for preparing light olefins from methanol

A low-carbon olefin and catalyst technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as catalyst pollution, and achieve short contact time, reduced dosage, and high yield of low-carbon olefins. Effect

Active Publication Date: 2008-12-24
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem of serious catalyst pollution during the start-up process in the prior art, and a new method for reducing catalyst pollution during the start-up process of the methanol-to-light olefins reaction unit is provided

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  • Method for reducing catalyst contamination in reaction for preparing light olefins from methanol

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Embodiment 1

[0017] Such as figure 1 In the methanol-to-olefins reaction-regeneration system shown, the reactor is a fast bed, the regenerator is a bubbling bed, the catalyst is SAPO-34 molecular sieve, the feed rate of methanol is 4 tons / hour, and fuel gas is fed into the auxiliary combustion chamber for ignition. The regeneration medium is heated, and the regeneration medium enters the regenerator after being heated, and the regenerator is heated to about 350°C. The catalyst is loaded into the circulating fluidized bed reaction regeneration device through a large dosing line, and the reaction zone is heated to 275°C through the circulation of the catalyst; the regeneration slide valve and the standby slide valve of the catalyst circulation inclined pipe are closed, and then methanol is passed into the The reactor is in contact with the catalyst, and coke is formed on the catalyst. After leaving the reaction zone of the reactor, the molecular sieve catalyst with coke does not enter the re...

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Abstract

The present invention relates to a method of reducing catalyst pollution during the driving process of a methanol to olefin reacting device. The method mainly solves the problem in the prior art of serious catalyst pollution during the driving process. The method comprises the steps as follows: a molecular sieve catalyst with coke is returned to a reaction area to react with raw materials continuously; after the average coke quantity of the catalyst in a reactor takes 2.0 percent to 6.0 percent in weight, torch oil is injected into a regenerator, the regenerator is heated to 500 DEG C to 700 DEG C immediately; the catalyst is circulated into the regenerator, the coke burns and produces heat; the injection of the torch oil is stopped, catalyst circulation between the reactor and the regenerator is established; after the temperature of the regenerator is stabilized between 600 DEG C and 700 DEG C, an auxiliary air chamber is stopped touse. The method solves the problem well by a technical proposal with the steps and can be applied in the industrial production of light olefin.

Description

technical field [0001] The invention relates to a method for reducing catalyst pollution during the start-up process of a methanol-to-light olefin reaction device. Background technique [0002] Olefins, the present invention mainly refers to 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 Es...

Claims

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Application Information

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IPC IPC(8): B01J29/90B01J29/85C07C1/20C07C11/02
CPCY02P20/52Y02P20/584
Inventor 齐国祯钟思青王洪涛金永明
Owner CHINA PETROLEUM & CHEM CORP
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