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Method for producing olefin

A production method and olefin technology, applied in the field of olefin production, can solve the problems of complex process, easy coking of cracking furnace tubes, poor high temperature resistance of coatings, etc.

Active Publication Date: 2015-03-11
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, will cause pollution to the environment and complicated process To provide a method for producing olefins by using a pyrolysis furnace tube with good anti-coking performance, high temperature resistance, and environmental protection

Method used

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preparation example Construction

[0035] According to the present invention, the preparation method of the cracking furnace tube also includes carrying out surface treatment on the cracking furnace tube substrate before the inert coating is loaded on the surface of the cracking furnace tube substrate, as long as the conditions of the surface treatment 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.

[0036] 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 ...

preparation Embodiment 1

[0041] This preparation example illustrates the preparation of the sols provided by the invention.

[0042] 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 value 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 After 24 hours, a stable, transparent aluminum sol with an average particle diameter of 15 nm was obtained.

preparation Embodiment 2

[0044] This preparation example illustrates the preparation of the sols provided by the invention.

[0045] Mix 40g of silicon powder, 15mL of water glass and 150mL of deionized water, stir at 90°C for 1 hour to obtain a mixture, adjust the pH value of the above mixture to 11 with a sodium hydroxide solution with a concentration of 1.6mol / L, and continue to After stirring at 90° C. for 24 hours, a stable and transparent silica sol with a particle diameter of 20 nm was obtained.

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Abstract

he invention provides a method for producing olefin. The method comprises step of placing cracking raw materials in a cracking furnace tube for cracking, so as to obtain the olefin. The cracking furnace tube comprises a cracking furnace tube matrix, and an inert coating attached to an inner wall of the cracking furnace tube matrix. The inert coating can prevent contact between coke and cracking furnace tube matrix, but does not react with the cracking raw materials and / or cracking products; the inert coating has a porous structure with average pore radius of 0.5-15nm, and specific surface area from 1m<2> / g to less than 150m<2> / g; the inert coating can also catalyze reaction between coke and water vapor; or the inert coating surface is attached by an active catalytic layer capable of catalyzing reaction between coke and water vapor; or the inert coating can catalyze reaction between coke and water vapor, and is also attached by an active catalytic layer capable of catalyzing reaction between coke and water vapor. 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 method for producing 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, the problems of coking and carburization will inevitably occur, thereby reducing the inner diameter of the furnace tube of the cracking furnace, increasing the pressure drop in the tube, hindering the normal progress of the cracking reaction, and affecting the yield of ethylene. Reduced 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 th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G9/16
Inventor 郏景省王红霞王申祥王国清
Owner CHINA PETROLEUM & CHEM CORP
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