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Method for returning regenerated catalyst to reactor in methanol-to-olefin process

A technology for regenerated catalysts and methanol to olefins, applied in chemical instruments and methods, molecular sieve catalysts, catalyst regeneration/reactivation, etc., can solve the problem of high temperature of regenerated catalysts

Active Publication Date: 2013-03-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is the high temperature problem of the regenerated catalyst entering the reactor in the prior art, and a new method for returning the regenerated catalyst to the reactor in the methanol-to-olefins process is provided

Method used

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  • Method for returning regenerated catalyst to reactor in methanol-to-olefin process

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Embodiment 1

[0018] On a small methanol-to-olefins reaction-regeneration unit, the regeneration system such as figure 1 shown. The regenerator adopts a fast fluidized bed, and the catalyst is SAPO-34 to ensure that the catalyst circulation of the reaction-regeneration system remains unchanged. The mass fraction of carbon deposits in the ungenerated catalyst is 4.7%. It enters the bottom of the regenerator regeneration zone and contacts with regeneration air. The regeneration temperature is 675°C, and the gas phase velocity in the regeneration zone is 1.2 m / s. The regenerated catalyst enters the double-dense bed zone, then enters the external heat extractor, and contacts with fluidized air. The regenerated catalyst acquires heat from the outside Part of the lower part of the device returns to the regeneration area, and part of it enters the degassing tank for degassing. The carbon deposition mass fraction of the regenerated catalyst after degassing is 0.24%, and the temperature is 466°C.

Embodiment 2

[0020] According to the conditions described in Example 1, the regeneration temperature was 602° C., the gas phase velocity in the regeneration zone was 0.8 m / s, the mass fraction of carbon deposits on the regenerated catalyst from the degassing tank was 2.48%, and the temperature was 401° C.

Embodiment 3

[0022] According to the conditions described in Example 1, the regeneration temperature was 691° C., the gas phase velocity in the regeneration zone was 2.0 m / s, the mass fraction of carbon deposits in the regenerated catalyst from the degassing tank was 0.02%, and the temperature was 539° C.

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Abstract

The invention relates to a method for returning a regenerated catalyst to a reactor in a methanol-to-olefin process. The method is used for solving the problem of the prior art that the temperature of the regenerated catalyst entering into the reactor is higher. The method for returning the regenerated catalyst to the reactor in the methanol-to-olefin process provided by the invention comprises the following steps: (1) providing a quick fluidized bed regenerator which comprises a regeneration area, a sedimentation area, an external heater and a degassing tank; (2) regenerating the catalyst bysending a to-be-generated catalyst to the regeneration area of the regenerator, thereby forming the regenerated catalyst; (3) dividing the regenerated catalyst which enters into the external heater into two parts, wherein one part returns to the regeneration area and the other part is degassed after entering into the degassing tank; and (4) returning the regenerated catalyst after being degassed to the reactor. The technical scheme is used for solving the problem. The method can be applied to industrial production of low-carbon olefin.

Description

technical field [0001] The invention relates to a method for returning a regenerated catalyst to a reactor in a methanol-to-olefins process. 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 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 converte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/90B01J38/30C07C1/20C07C11/04C07C11/06
CPCY02P20/52Y02P20/584Y02P30/20Y02P30/40
Inventor 齐国祯钟思青杨远飞王华文
Owner CHINA PETROLEUM & CHEM CORP