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Quick cleaning method for reaction gas cooler of acrylonitrile plant

A reaction gas and reactor technology, applied in the field of acrylonitrile production, can solve problems such as increasing propylene consumption, and achieve the effects of eliminating potential safety hazards, reducing losses, and reducing material losses

Active Publication Date: 2019-10-22
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Calculated according to the current processing frequency, the production of acrylonitrile will be greatly affected every year, and the temperature of the reactor will increase by 220 tons of propylene consumption when starting up.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In the first step, the propylene feed of the reactor is first withdrawn, the withdrawal heat pump of the reactor is stopped, and the molybdenum series catalyst used in the reaction of the original acrylonitrile is used as a combustion catalyst to burn ammonia in the reactor to maintain the temperature of the reactor; Blow out the propylene, acrylonitrile, acetonitrile, hydrocyanic acid and other products in the reactor or burn them to replace them; this process should be maintained for 30 minutes; at this time, only ammonia and air are left in the reactor;

[0021] In the second step, the temperature of the reactor is raised to 455° C. by increasing the feed amount of ammonia to the reactor; this is allowed by the reactor in the safety technical regulations. Raising the temperature of the reactor is to prepare for the next step of replacement of the reactor; this process should also be maintained for 60 minutes; according to the research on acrylonitrile catalysts, we kn...

Embodiment 2

[0027] In the first step, the propylene feed of the reactor is first withdrawn, the withdrawal heat pump of the reactor is stopped, and the molybdenum series catalyst used in the reaction of the original acrylonitrile is used as a combustion catalyst to burn ammonia in the reactor to maintain the temperature of the reactor; The propylene, acrylonitrile, acetonitrile, hydrocyanic acid and other products in the reactor are blown out of the reactor or replaced by burning; this process should be maintained for 31 minutes; at this time, only ammonia and air are left in the reactor;

[0028] In the second step, the temperature of the reactor is raised to 456° C. by increasing the feed amount of ammonia to the reactor; this is allowed by the reactor in the safety technical regulations. Raising the temperature of the reactor is to prepare for the next step of replacement of the reactor; this process also needs to be maintained for 62 minutes; according to the research on acrylonitrile ...

Embodiment 3

[0034] In the first step, the propylene feed of the reactor is first withdrawn, the withdrawal heat pump of the reactor is stopped, and the molybdenum series catalyst used in the reaction of the original acrylonitrile is used as a combustion catalyst to burn ammonia in the reactor to maintain the temperature of the reactor; The propylene, acrylonitrile, acetonitrile, hydrocyanic acid and other products in the reactor are blown out of the reactor or replaced by burning; this process should be maintained for 29 minutes; at this time, only ammonia and air are left in the reactor;

[0035] In the second step, the temperature of the reactor is raised to 454° C. by increasing the feed amount of ammonia to the reactor; this is allowed by the reactor in the safety technical regulations. Raising the temperature of the reactor is to prepare for the next step of replacement of the reactor; this process also needs to be maintained for 63 minutes; according to the research on acrylonitrile ...

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PUM

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Abstract

The invention relates to an acrylonitrile device reaction gas cooler quick-cleaning method, which belongs to the technical field of acrylonitrile production, and is characterized by comprising the cleaning steps of removing propylene feeding of a reactor, stopping a heat removing water pump of the reactor, burning ammonia gas for 27min to 33min, rising the temperature of the reactor to 453 DEG C to 458 DEG C through improving the feeding amount of the ammonia gas, maintaining for 55min to 65min, and air purging the reactor so as to replace gas in the reactor; feeding nitrogen into the reactor,wherein the volume of the nitrogen amount entering the reactor under ordinary pressure is 2 to 4 times of the volume of a cooler; starting a water supply pump, independently cooling the cooler connected to the rear part of the reactor, and disassembling a seal head and adding a blind plate for carrying out water pressure cleaning on the cooler after the temperature of the cooler is reduced to theprocessing temperature required for acrylonitrile reaction. According to the cleaning method, the parking time is shortened to be 1 / 4 to 1 / 7 of the original parking time, and the single-pass yield ofacrylonitrile is more than 81 percent after driving.

Description

technical field [0001] The invention discloses a quick cleaning method for a reaction gas cooler of an acrylonitrile plant, belonging to the technical field of acrylonitrile production. Background technique [0002] After the acrylonitrile plant has been in operation for a period of time, the reaction gas cooler (E-102) will be blocked due to the impurities generated by the reaction and the natural loss of the catalyst, which will increase the top pressure of the cooler R101 and affect the load of the cooler. At the same time, the catalyst The fluidization condition of the bed becomes worse, and the single yield of acrylonitrile decreases. In order to solve this problem, the cooler must be shut down regularly, and the reaction gas cooler must be cleaned with water pressure. According to the normal cleaning procedure of E-102, after the reactor is shut down, the temperature should be lowered, all catalysts should be discharged from the reactor, and the reaction system should...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28G13/00F28G9/00F28G11/00F28G15/00
Inventor 于卫成徐海涛宫晓燕杜球马超冯星桂恩虎苗光庆王东廷田春燕
Owner CHINA PETROLEUM & CHEM CORP
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