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Quench process of acrylonitrile

A technology of acrylonitrile and quenching, applied in the direction of carboxynitrile purification/separation, organic chemistry, etc., can solve the problems of uneven spraying, low recovery rate of acrylonitrile, etc., to improve the ammonia removal effect, the recovery rate and the recovery rate rate effect

Inactive Publication Date: 2004-08-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the existing literature in the past that the acidic ammonium salt waste liquid must be directly buried in deep to improve the recovery rate of acrylonitrile or the spraying is uneven due to the internal components of the quenching tower, so that the lower part is partially strong alkali property, causing the defect of low recovery rate of acrylonitrile, providing a new quenching method for acrylonitrile

Method used

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  • Quench process of acrylonitrile
  • Quench process of acrylonitrile

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Effect test

Embodiment 1

[0024]The reaction gas entering the quenching tower contains 42 grams of acrylonitrile per hour, the temperature is 210°C, the upper section is 5 theoretical plates, and the lower section is an empty tower. , the spray volume of the upper section circulation is 123.6 ml / min, and sulfuric acid is added into the upper section circulating fluid to control the pH value of the upper section circulating fluid to be 3.5. The circulation spray volume of the lower section is 31.9 ml / min, the temperature is 82°C, and the blowdown rate is 0.4 ml / min. Acetic acid is directly added to the lower section of the tower kettle to adjust the pH value of the lower section of the kettle to 7.5. The gas at the outlet of the tower top contains 38.9 g / h of acrylonitrile, and the recovery rate of acrylonitrile in the quenching tower is 92.6%.

Embodiment 2

[0026] The reaction gas entering the quenching tower contains 42 grams of acrylonitrile per hour, the temperature is 210°C, the upper section is 5 theoretical plates, and the lower section is an empty tower. , the spray volume of the upper section circulation is 123.6 ml / min, and sulfuric acid is added into the upper section circulating fluid to control the pH value of the upper section circulating fluid to be 3.5. The lower cycle spraying volume is 31.9 ml / min, and oxalic acid is directly added to the lower tower kettle, and the pH value of the kettle liquid is adjusted to 7.0, and the blowdown rate is 0.4 ml / min. The gas at the outlet of the tower top contains 39.7 g / h of acrylonitrile, and the recovery rate of acrylonitrile in the quenching tower is 94.5%.

Embodiment 3

[0028] The reaction gas entering the quenching tower contains 42 grams of acrylonitrile per hour, the temperature is 210°C, the upper section is 5 theoretical plates, and the lower section is an empty tower. , the spray volume of the upper section circulation is 123.6 ml / min, and sulfuric acid is added into the upper section circulating fluid to control the pH value of the upper section circulating fluid to be 3.5. The lower stage circulation spraying amount is 31.9 milliliters / minute, makes the weight concentration of the polymer of acrylonitrile, hydrocyanic acid or acrolein and the mixture thereof in the tower kettle be 0.5% by increasing the supplementary water yield, directly adds in the tower kettle with acrylic acid, regulates The pH value of the kettle liquid was 7.0. The gas at the outlet of the tower top contains 39.9 g / h of acrylonitrile, and the recovery rate of acrylonitrile in the quenching tower is 95.0%.

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Abstract

A process for suddenly cooling acrylonitrile features that the acid is directly added to tower still at lower part of suddenly cooling tower, the pH value of liquid in tower still is controlled to 7-7.5, and the water is supplemented to lower segment to control the concentration of heavy component in the liquid of tower still. Its advantage is high recovery rate of acrylonitrile.

Description

technical field [0001] The invention relates to a method for quenching acrylonitrile. Background technique [0002] The production of unsaturated nitrile by ammoxidation of hydrocarbons is an important field in the petrochemical industry. Among them, the ammoxidation of propylene or isobutene to acrylonitrile or methacrylonitrile has already been industrialized, but there is a common problem, that is, the unsaturated nitrile is under alkaline conditions. Is unstable, prone to polymerization. Therefore, no matter what kind of ammoxidation reaction, the unreacted ammonia in the reaction gas needs to be removed. At present, the unreacted ammonia is removed by quenching with sulfuric acid. [0003] Take the ammoxidation of propylene to acrylonitrile as an example: propylene, ammonia and air pass through the ammoxidation of the fluidized bed reactor to produce the main product acrylonitrile and by-products acetonitrile, hydrocyanic acid, acrolein, acryli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C253/34C07C255/08
Inventor 方永成顾军民甘永胜韩诚康李文婷
Owner CHINA PETROLEUM & CHEM CORP
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