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Method for treating inner surface of light dydrocarbon aromatization reactor

An aromatization reactor and inner surface technology, which is applied in the direction of coating, metal material coating process, solid-state diffusion coating, etc., can solve the problems of coating peeling and insufficient service life, so as to reduce the amount of coke and reduce the cost. Inexpensive, great results

Active Publication Date: 2020-05-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the inert coating formed by these externally applied elements is often not durable enough in actual industrial applications, and the coating will peel off a lot after a few cycles, so this coating is not widely used in industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 304 stainless steel hanging piece, the outer wall is polished with sandpaper to remove scale, and the method of the present invention is used to process, the steps are as follows:

[0048] (1) In pure H 2 Under normal pressure conditions, the aromatization reactor was heated to 950°C at a heating rate of 600°C / h, and then the reactor was cooled to 800°C at a cooling rate of 80°C / h;

[0049] (2) When containing H 2 and CH 4 In the presence of the first mixed gas, at a pressure of 0.3MPa and a temperature of 800°C for 20h, where CH 4 Volume percentage content is 1.5%;

[0050] (3) After the constant temperature is completed, the temperature is lowered to 600°C at a rate of 50°C / h. During the cooling process, the gas pressure, composition, CH 4 The volume percentage remains unchanged;

[0051] (4) When containing H 2 and CH 4 In the presence of the second mixed gas, at a pressure of 0.5MPa and a temperature of 600°C for 10h, wherein CH 4 Volume percentage content i...

Embodiment 2

[0055] 310 stainless steel hanging piece, the outer wall is polished with sandpaper to remove scale, and the method of the present invention is used to process, the steps are as follows:

[0056] (1) In pure H 2 Under normal pressure conditions, the aromatization reactor is heated to 1000°C at a heating rate of 400°C / h, and then the reactor is cooled to 900°C at a cooling rate of 50°C / h;

[0057] (2) When containing H 2 and CH 4 In the presence of the first mixed gas, the pressure is 0.4MPa, the temperature is 900°C for 10h, wherein CH 4 Volume percentage content is 2.0%;

[0058] (3) After the constant temperature is completed, the temperature is lowered to 700°C at a rate of 80°C / h. During the cooling process, the gas pressure, composition, CH 4 The volume percentage remains unchanged;

[0059] (4) When containing H 2 and CH 4 In the presence of the second mixed gas, at a pressure of 0.8MPa and a temperature of 700°C for 20h, where CH 4 Volume percentage content is 4...

Embodiment 3

[0063] 316 stainless steel hanging piece, the outer wall is polished with sandpaper to remove scale, and the method of the present invention is used to process, the steps are as follows:

[0064] (1) In pure H 2 Under normal pressure conditions, the aromatization reactor was heated to 960°C at a heating rate of 500°C / h, and then the reactor was cooled to 880°C at a cooling rate of 20°C / h;

[0065] (2) When containing H 2 and CH 4 In the presence of the first mixed gas, at a pressure of 0.5MPa and a temperature of 880°C for 25h, where CH 4 Volume percentage content is 0.8%;

[0066] (3) After the constant temperature is over, cool down to 500°C at a rate of 80°C / h. During the cooling process, the gas pressure, composition, CH 4 The volume percentage remains unchanged;

[0067] (4) When containing H 2 and CH 4 In the presence of the second mixed gas, the pressure is 0.3MPa, the temperature is kept at 500°C for 15h, wherein CH 4 Volume percentage content is 5%;

[0068] ...

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Abstract

The invention relates to the field of light dydrocarbon aromatization equipment, and discloses a method for treating the inner surface of a light dydrocarbon aromatization reactor. The method comprises the following steps that heat treatment is performed on the inner surface of the aromatization reactor in an atmosphere with carbonized gases of different pressure, and a compact carbide protectinglayer is formed on the inner surface of the reactor, wherein the step of heat treatment includes temperature rising, first temperature reduction, first constant temperature keeping, second temperaturereduction, second constant temperature keeping and third temperature reduction in sequence. The light dydrocarbon aromatization reactor is treated by employing the method, so that the amount of cokedepositing on the inner surface of the reactor can be reduced by 70% or more.

Description

technical field [0001] The invention relates to the field of light hydrocarbon aromatization equipment, in particular to a method for treating the inner surface of a light hydrocarbon aromatization reactor. Background technique [0002] Light hydrocarbon aromatization technology is a new type of petroleum processing technology developed in the past 20 years, which is characterized by the use of modified zeolite molecular sieve catalysts to directly convert low molecular weight hydrocarbons into light aromatics such as BTX or gasoline. With the development of modern industry, the demand for light aromatic hydrocarbons as basic chemical industry raw materials and high-octane gasoline components continues to increase, while petroleum resources are increasingly scarce. Therefore, based on the existing petroleum resources, it is of great practical significance to use the aromatization process to broaden the raw material resources for the production of aromatics and increase the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/22
CPCC23C8/22
Inventor 王申祥王红霞王国清郏景省张利军
Owner CHINA PETROLEUM & CHEM CORP