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Catalyst regeneration method

A technology of catalysts and prepared catalysts, which is applied in the direction of catalysts, molecular sieve catalysts, carbon compound catalysts, etc., to achieve the effect of increasing the yield of low-carbon olefins

Inactive Publication Date: 2018-04-24
潜江市大虾风范水产品养殖有限公司
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the regeneration of methanol-to-olefins SAP0-34 catalyst in the prior art is only limited to the problem of providing a kind of carbon deposition regeneration catalyst, and a new catalyst regeneration method is provided

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  • Catalyst regeneration method

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Embodiment Construction

[0015] in such as figure 1 In the regeneration device shown, the mass fraction of carbon deposits in the catalyst to be regenerated is 4.5%, the first regeneration zone is a fast fluidized bed, and the regeneration temperature is 648°C, and the second regeneration zone is a dense-phase fluidized bed, and the regeneration temperature is It is 682°C, and a heat extraction coil is installed inside to control the regeneration temperature. Nitrogen is supplemented in the first regeneration zone, and the oxygen concentration is controlled to be 5.98%. The regeneration medium in the second regeneration zone is air, and 40% of the regenerated catalyst I enters the second regeneration zone. Two regeneration zones, 60% demethanol to olefins reactor, methanol to olefins reactor reaction conditions are: temperature of reaction is 475 ℃, and gas phase linear velocity is 1.25 m / s, and the average carbon deposit of catalyst is 3.2% (weight), The regenerated catalyst II is used for the cataly...

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Abstract

The invention relates to a catalyst regeneration method, and mainly solves the problem that in the prior art, regeneration of a methanol-to-olefin SAP0-34 catalyst is only limited to providing a carbon-deposition regenerated catalyst. The catalyst regeneration method comprises the following steps: (1) a catalyst to be regenerated enters a first regeneration zone, a flue gas stream produced by combustion of deposited carbon is subjected to gas-solid separation, then the processed flue gas stream enters a power recovery system, and a regenerated catalyst I with a deposited carbon mass fraction of 0.5-2.5% is obtained at the same time; (2) at least a part of the regenerated catalyst I enters a second regeneration zone and is in contact with a regeneration medium, a flue gas stream in the second regeneration zone is subjected to gas-solid separation, then the processed flue gas stream enters the first regeneration zone, and a regenerated catalyst II with a deposited carbon mass fraction smaller than 0.5% is obtained at the same time. The technical scheme well solves the problem, and the method can be used in industrial production of low-carbon olefins.

Description

technical field [0001] The invention relates to a catalyst regeneration method, in particular to a catalyst regeneration method. 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 low-carbon olefins are 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...

Claims

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Application Information

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IPC IPC(8): B01J29/90B01J29/85C07C1/20C07C11/04C07C11/06
CPCB01J29/85B01J29/90C07C1/20C07C2529/85C07C11/04C07C11/06Y02P20/50Y02P20/52Y02P20/584Y02P30/20Y02P30/40
Inventor 刘乔
Owner 潜江市大虾风范水产品养殖有限公司
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