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Method for producing olefin

A production method and technology of olefins, applied in the field of olefins production, can solve problems such as polluting process, easy coking of cracking furnace tubes, and poor erosion resistance

Active Publication Date: 2014-08-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the easy coking of the cracking furnace tube in the olefin production process, and the coating obtained by using the method of the prior art to process the cracking furnace tube has poor high temperature resistance and erosion resistance, which will pollute the environment And the defects of complex process, and provide a method for the production of olefins by using cracking furnace tubes with good anti-coking performance, high temperature resistance, erosion resistance, and environmental protection

Method used

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preparation example Construction

[0036]According to the present invention, the preparation method of the cracking furnace tube also includes surface-treating the cracking furnace tube substrate before the surface of the cracking furnace tube substrate is loaded with the first sol, and the surface treatment method only needs to ensure that the obtained The roughness Ra of the surface of the cracking furnace tube substrate is above 0.2 μm, preferably 0.2-0.8 μm. Usually, the surface treatment method includes: oxidizing the cracking furnace tube substrate at 600-1100° C. for 0.5-24 hours in an oxidizing atmosphere.

[0037] The oxidizing atmosphere refers to a gas that can generate corresponding oxide grains with the cracking furnace tube substrate, for example, it can be one or more of water vapor, carbon dioxide, air and oxygen. The method for maintaining the oxidizing atmosphere can be to pass any of the above-mentioned gases or gas mixtures into the cracking furnace tube, in order to dilute the concentration...

preparation Embodiment 1

[0042] This preparation example illustrates the preparation of the first sol and the second sol provided by the present invention.

[0043] Mix 24g of pseudo-boehmite and 200mL of deionized water, stir at 85°C for 0.5 hours to obtain a mixture, adjust the pH of the above mixture to 2.5 with a nitric acid solution with a concentration of 1.6mol / L, and continue stirring at 85°C for 24 After 1 hour, a stable, transparent aluminum sol with an average particle diameter of 15 nm was obtained.

preparation Embodiment 2

[0045] This preparation example illustrates the preparation of the first sol and the second sol provided by the present invention.

[0046] Mix 40g of silicon powder, 15mL of water glass and 150mL of deionized water, and stir at 90°C for 1 hour to obtain a mixture. Use a sodium hydroxide solution with a concentration of 1.6mol / L to adjust the pH of the above mixture to 11, and continue at 90°C. After stirring at °C for 24 hours, a stable and transparent silica sol with a particle diameter of 20 nm was obtained.

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Abstract

The invention provides a method for producing olefin. The method comprises step of placing cracking raw materials in a cracking furnace tube for conducting cracking under cracking conditions, so as to obtain the cracking product olefin. The cracking furnace tube comprises a cracking furnace tube matrix, an adhesive layer attached to an inner wall of the cracking furnace tube matrix, and an anti-coking and anti-permeability carbon layer attached to the adhesive layer surface; the adhesive layer is a coating capable of bonding the cracking furnace tube matrix and the anti-coking and anti-permeability carbon layer, and preventing the coke from contacting with the cracking furnace tube matrix; the anti-coking and anti-permeability carbon layer is a coating, which can prevent the coke from contacting with the cracking furnace tube matrix, but does not react with cracking raw materials and / or cracking products; the adhesive layer and the anti-coking and anti-permeability carbon layer have a porous structure; and the average pore radius of the pore structure of the adhesive layer is less than that of the pore structure of the anti-coking and anti-permeability carbon layer. The method for producing olefin provided by the invention has simple operation and good anti-coking performance.

Description

technical field [0001] The present invention relates to a production method of olefins. Background technique [0002] Ethylene is one of the most important basic raw materials in the petrochemical industry. At present, the method of producing ethylene is mainly based on tube furnace cracking technology, which has been widely used in the world. However, in the production process of ethylene, coking and carburization will inevitably occur, so that the inner diameter of the furnace tube of the cracking furnace becomes smaller, and the pressure drop in the tube increases, which hinders the normal progress of the cracking reaction and affects the yield of ethylene. , reducing production efficiency. In addition, the high temperature of the cracking can easily promote the carburization of the inner wall of the furnace tube of the cracking furnace, that is, the chemical reaction between the carbon deposit and the base material of the furnace tube will lead to the weakening of the ...

Claims

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Application Information

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IPC IPC(8): C07C7/20C07C11/02C07C11/04
Inventor 郏景省王红霞王申祥王国清
Owner CHINA PETROLEUM & CHEM CORP
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