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Acrylonitrile device reaction gas cooler quick-cleaning method

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

Active Publication Date: 2018-03-13
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] The first step is to withdraw the propylene feed from the reactor, stop the hot water pump of the reactor, and use the molybdenum catalyst used in the original acrylonitrile reaction as the combustion catalyst to burn ammonia in the reactor to maintain the reactor temperature; The propylene, acrylonitrile, acetonitrile, hydrocyanic acid and other products in the reactor are blown out of the reactor or burned out; this process needs to be maintained for 30 minutes; at this time, only ammonia and air remain in the reactor;

[0021] In the second step, the reactor temperature was raised to 455°C by increasing the ammonia feed rate of the reactor; this is allowed by the reactor in the safety technical regulations. Increasing the temperature of the reactor is to prepare for the next replacement of the reactor; this process should also be maintained for 60 minutes; according to the research on the acrylonitrile catalyst, we have learned that the reactor can burn ammonia at a high...

Embodiment 2

[0027] The first step is to withdraw the propylene feed from the reactor, stop the hot water pump of the reactor, and use the molybdenum catalyst used in the original acrylonitrile reaction as the combustion catalyst to burn ammonia in the reactor to maintain the reactor temperature; The propylene, acrylonitrile, acetonitrile, hydrocyanic acid and other products in the reactor are blown out of the reactor or burned out; this process takes 31 minutes; at this time, only ammonia and air remain in the reactor;

[0028] In the second step, the reactor temperature was increased to 456°C by increasing the ammonia feed rate to the reactor; this is allowed by the reactor in the safety technical regulations. Increasing the reactor temperature is to prepare for the next replacement of the reactor; this process also needs to be maintained for 62 minutes; according to the research on the acrylonitrile catalyst, we have learned that the reactor can burn ammonia at a higher temperature, and the...

Embodiment 3

[0034] The first step is to withdraw the propylene feed from the reactor, stop the hot water pump of the reactor, and use the molybdenum catalyst used in the original acrylonitrile reaction as the combustion catalyst to burn ammonia in the reactor to maintain the reactor temperature; The propylene, acrylonitrile, acetonitrile, hydrocyanic acid and other products in the reactor are blown out of the reactor or replaced by combustion; this process needs to be maintained for 29 minutes; at this time, only ammonia and air remain in the reactor;

[0035] The second step is to increase the reactor's ammonia feed rate to increase the reactor temperature to 454°C; this is allowed by the reactor in the safety technical regulations. Increasing the temperature of the reactor is to prepare for the next replacement of the reactor; this process should also be maintained for 63 minutes; according to the research on the acrylonitrile catalyst, we have learned that the reactor can burn ammonia at a...

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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] A quick cleaning method for a reaction gas cooler of an acrylonitrile device belongs to the technical field of acrylonitrile production. Background technique [0002] After the acrylonitrile plant has been running for a period of time, the reaction gas cooler (E-102) tube will be blocked due to the impurities and catalysts that are produced by the reaction, which will increase the top pressure of the cooler R101 and affect the load of the cooler. The bed fluidization condition became worse, and the single yield of acrylonitrile decreased. In order to solve this problem, the cooler must be shut down regularly, and the reaction gas cooler must be hydrostatically cleaned. According to the normal cleaning procedure of E-102, the reactor should be cooled after shutdown, the catalyst should be discharged from the reactor, and the reaction system should be completely replaced. The whole process takes 4-7 days. Calculated according to the current processing frequ...

Claims

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Application Information

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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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