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Reaction device for producing low-carbon olefin by using methanol as raw materials

A technology of low-carbon olefins and reaction devices, which is applied in the field of reaction devices for the production of low-carbon olefins, and can solve the problems of low yields of low-carbon olefins

Inactive 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

[0007] The technical problem to be solved by the present invention is the problem of low yield of low-carbon olefins existing in the prior art, and a new reaction device for producing low-carbon olefins with methanol as raw material is provided

Method used

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  • Reaction device for producing low-carbon olefin by using methanol as raw materials
  • Reaction device for producing low-carbon olefin by using methanol as raw materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] in such as figure 1 In the reaction device shown, the catalyst is SAPO-34, the main reaction zone is a fast fluidized bed, the pre-reaction zone is a dense-phase fluidized bed, and a gas-solid cyclone separator is arranged inside the settling section. The diameter of the main reaction zone is the same as the pre-reaction zone. The diameter ratio of the reaction zone is 0.3:1. The methanol raw material enters the pre-reaction zone through the distribution plate. The bottom of the main reaction zone is provided with a distribution plate with an opening ratio of 0.3. The catalyst in the pre-reaction zone is divided into two parts, 20% to be regenerated 80% of the product stream enters the main reaction zone. The reaction conditions in the main reaction zone are as follows: the reaction temperature is 500°C, the reaction pressure is 0.1Mpa in terms of gauge pressure, the gas phase velocity is 1.5 m / s, and the average carbon deposition amount of the catalyst is The mass frac...

Embodiment 2

[0020] According to the conditions and steps described in Example 1, only the ratio of the diameter of the main reaction zone to the diameter of the pre-reaction zone is 0.7: 1, the bottom of the main reaction zone is provided with a distribution plate, the opening ratio is 0.6, and the catalyst in the pre-reaction zone It is divided into two parts, 50% goes to the regenerator for regeneration, 50% and the product flow enter the main reaction zone, the reaction conditions in the main reaction zone: the reaction temperature is 425 ° C, the reaction pressure is 0.01Mpa in terms of gauge pressure, and the gas phase velocity is 3.0 m / s, the mass fraction of the average carbon deposit on the catalyst is 1.5%, and the mass fraction of the carbon deposit on the regenerated catalyst is 0.046%. The linear velocity is 0.96 m / s, and the average carbon deposit mass fraction of the catalyst is 2.0%, and the raw catalyst is divided into two parts after stripping, 40% returns to the pre-react...

Embodiment 3

[0022] According to the conditions and steps described in Example 1, only the ratio of the diameter of the main reaction zone to the diameter of the pre-reaction zone is 0.5: 1, the catalyst in the pre-reaction zone is divided into two parts, 50% goes to the regenerator regeneration, 50% and The product flow enters the main reaction zone, and the reaction conditions in the main reaction zone are as follows: the reaction temperature is 476°C, the reaction pressure is 0.15Mpa in gauge pressure, the gas phase velocity is 1.27 m / s, and the average carbon deposition mass fraction of the catalyst is 3.6%. The carbon deposition mass fraction of the regenerated catalyst is 2.5%, the reaction conditions in the pre-reaction zone: the reaction temperature is 421°C, the reaction pressure is 0.15Mpa in terms of gauge pressure, the gas phase velocity is 0.54 m / s, and the average carbon deposition mass fraction of the catalyst is 4.15%, the raw catalyst is divided into two parts after strippi...

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Abstract

The invention relates to a reaction device for producing low-carbon olefin by using methanol as raw materials, which mainly solves the problem of lower yield of the low-carbon olefin in the prior art. The reaction device for producing the low-carbon olefin by using the methanol as the raw materials adopts the technical scheme that the reaction device mainly comprises a pre-reaction region 12, a main reaction region 2, a steam stripping area 3 and a catalyst circulation pipeline, wherein the top of the pre-reaction region 12 is connected with the bottom of the main reaction region 2, an outlet of the main reaction region 2 is provided with fast gas and solid separation equipment 5, the steam extraction region 3 is positioned at the upper part of the main reaction region 12, a sedimentation section 7 is positioned at the upper part of the steam extraction region 3, the bottom of the steam extraction region 3 is provided with at least two catalyst outlets which are respectively connected with the pre-reaction region 12 and the main reaction region 2, the bottom of the pre-reaction region 12 is provided with a catalyst outlet connected with a spent inclined pipe 9, and the lower part of the main reaction region 2 is provided with a catalyst inlet connected with a regeneration inclined pipe 11. The problem is perfectly solved, and the reaction device can be used for industrial production of the low-carbon olefin.

Description

technical field [0001] The invention relates to a reaction device for producing light olefins by using methanol as a raw material. 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 converted from coa...

Claims

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Application Information

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IPC IPC(8): B01J8/24C07C1/20C07C11/04C07C11/06
CPCY02P20/52Y02P30/20Y02P30/40
Inventor 齐国祯王莉金永明王华文
Owner CHINA PETROLEUM & CHEM CORP