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Rapid parking method of methanol to olefins reaction-regeneration system

A methanol-to-olefin and regeneration system technology, which is applied in chemical instruments and methods, hydrocarbon production from oxygen-containing organic compounds, molecular sieve catalysts, etc. The effect of short time, weakening influence, and avoiding prolonged contact

Active Publication Date: 2011-05-18
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that in the prior art, the shutdown process takes a long time and the shutdown process leads to uneven charcoal burning and activity loss of the catalyst. It provides a new rapid shutdown method for the methanol-to-olefins reaction-regeneration system

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  • Rapid parking method of methanol to olefins reaction-regeneration system

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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, and the feed rate of methanol is 4 tons / hour. The feed flow / time speed is gradually cut out of the reactor within 1 hour, that is, the amount of methanol feed is reduced by 1 ton each time, and each time interval is 15 minutes. At the same time or after the raw material is cut out of the reactor, medium-pressure steam at 275°C is cut into the reaction system, and the amount of steam cut in is 50% of the amount of raw material cut out, that is, 1 ton of methanol is not cut out, and 0.5 ton is supplemented water vapor. Slightly increase the circulation volume of the catalyst to ensure the normal circulation of the catalyst in the reaction-regeneration system, continue to pass regeneration air into the regenerator, and control the temperature of the regenerator at about 680°C. While maintaini...

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Abstract

The invention relates to a rapid stop method in a methanol-to-olefin reaction-regeneration system, mainly solves the problems of long stop time and non-uniform catalyst coke burning and activity loss during the stop process in the prior art. The method comprises the following steps: a. gradually cutting the materials containing methanol out of a reactor and cutting the vapor in the reacting system; b. continuously cycling the catalyst in a reaction-regeneration system; c. spraying burning oil at the dense phase section of the regenerator when the temperature of the regenerator is lower than 600 DEG C; d. stopping spraying the burning oil to the regenerator after the coke content of the catalyst is less than 0.5% by weight; e. closing a slide valve on a regenerator inclined tube when the temperature is down to 500-550 DEG C; f. conveying the catalyst in the reactor to the regenerator while unloading the catalyst in the regenerator; g. reducing the pressure of the reaction-regenerationsystem after finishing unloading. The technique scheme of the invention well solves the above problem and is suitable to the industrial production of light olefins.

Description

technical field [0001] The invention relates to a quick shutdown method of a methanol-to-olefins reaction-regeneration system. 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 Esters), etc., these oxygenated compoun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/20C07C11/02B01J29/85B01J8/24
CPCY02P20/584
Inventor 齐国祯钟思青金永明忻晓琦
Owner CHINA PETROLEUM & CHEM CORP
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