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Treatment method for three-spinning recycling of catalyst in reactor for preparing alkene from methyl alcohol

A technology of methanol to olefins and treatment methods, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low safety factor and easy mixing of impurities in products, and achieve high safety factor and good technical effect Effect

Active Publication Date: 2012-05-23
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 to solve the problem that the product gas is easy to be mixed with impurities and the safety factor is low when the catalyst fine powder recovered by the triple cyclone is returned to the reactor and unloaded at the same time, and a new methanol-to-olefins reaction is provided. The treatment method of three cyclone recovery catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] In the methanol-to-olefins circulating fluidized bed reaction-regeneration unit, the catalyst is SAPO-34, the reactor is a fluidized bed, and the outlet is equipped with three cyclones, the separation efficiency is about 68%, and the average particle size of the recovered catalyst fine powder is about 16 Micron, the recovered catalyst fine powder enters the primary catalyst fine powder collection tank, the fluidization gas in the primary catalyst fine powder collection tank is water vapor at 265°C, and the catalyst fine powder in the primary catalyst fine powder collection tank % returns to the reactor, the catalyst fine powder flow rate is controlled by the slide valve, 95% enters the secondary catalyst fine powder collection tank, the fluidization gas in the secondary catalyst fine powder collection tank is nitrogen, and the primary catalyst fine powder collection tank is connected to the secondary catalyst fine powder collection tank. There are standpipes between the ...

Embodiment 2

[0017] According to the method and steps described in Example 1, the recovered catalyst fine powder enters the primary catalyst fine powder collection tank, and the fluidization gas in the primary catalyst fine powder collection tank is fuel gas, and the fuel gas comes from the methanol-to-olefins process By-products (methane, hydrogen, ethane, etc.) generated in the reactor, 80% of the catalyst fine powder in the primary catalyst fine powder collection tank is returned to the reactor, and the flow rate of the catalyst fine powder is controlled by a slide valve, and 20% enters the secondary catalyst fine powder Collection tank, the fluidizing gas in the secondary catalyst fine powder collection tank is air, and a standpipe is installed between the primary catalyst fine powder collection tank and the secondary catalyst fine powder collection tank to maintain sufficient catalyst material seal to prevent secondary catalyst The fluidization gas in the fine powder collection tank es...

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Abstract

The invention relates to a treatment method for three-spinning recycling of a catalyst in a reactor for preparing alkene from methyl alcohol, mainly solving the problems that when fine catalyst powder which is obtained in the three-spinning recycling process returns to the reactor and is discharged at the same time, product gas is easily doped with impurities and low in safety coefficient. The treatment method for the three-spinning recycling of the catalyst in the reactor for preparing alkene from methyl alcohol mainly comprises the following steps: the fine catalyst powder which is obtained in the three-spinning recycling process of the reactor enters a primary fine powder collecting tank, 5-80 percent of the fine catalyst powder returns to the reactor and 20-95 percent of the fine catalyst powder enters a secondary fine powder collecting tank from the primary fine powder collecting tank; and the fine catalyst powder in the secondary fin powder collecting tank is discharged and enters a catalyst storage tank; and the treatment method is characterized in that a fluidized medium in the primary fine powder collecting tank is water steam or fuel gas and a fluidized medium in the secondary fine powder collecting tank is nitrogen gas or air. By the technical scheme of the treatment method, the problems are solved well; and the treatment method can be applied to the industrial production of low-carbon alkene.

Description

technical field [0001] The invention relates to a treatment method for a three-cyclone recovery catalyst in a methanol-to-olefins reactor. 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 light olefins are oxygenates, 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, nat...

Claims

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Application Information

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IPC IPC(8): B01J29/85B01J8/24C07C1/20C07C11/04C07C11/06
CPCY02P20/52Y02P20/584Y02P30/20Y02P30/40
Inventor 齐国祯钟思青张惠明王菊
Owner CHINA PETROLEUM & CHEM CORP
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