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Quench process for raising recovery of acrylonitrile

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

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

AI Technical Summary

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 for raising recovery of acrylonitrile
  • Quench process for raising recovery of acrylonitrile
  • Quench process for raising recovery of acrylonitrile

Examples

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Comparison scheme
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 spraying rate of the lower stage circulation is 31.9 ml / min, and the temperature of the spraying liquid after being cooled by a cooler is 70°C, and the weight concentration of the polymer of acrylonitrile, hydrocyanic acid or acrolein and the mixture thereof in the tower kettle is increased by increasing the amount of replenishing water. It is 2.0%, and the pH value of the kettle liquid is 7.5. The gas at the outlet of the tower top contains 39.4 g / h of acrylonitrile, and the recovery rate of acrylonitrile in the quenching tower is 93.8%.

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 circulation spraying amount is 31.9 milliliters / min, and the temperature of the spraying liquid is 60° C. after being cooled by a cooler, and the weight concentration of the polymer of acrylonitrile, hydrocyanic acid or acrolein and the mixture thereof in the tower kettle is 0.5%, the pH value of the kettle liquid is 7.5. 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 spray rate of the lower stage circulation is 31.9 ml / min, and the temperature of the spray liquid is 50°C after being cooled by the cooler, and the weight concentration of the polymer of acrylonitrile, hydrocyanic acid or acrolein and the mixture thereof in the tower kettle is increased by increasing the amount of supplementary water. 0.5%, with acetic acid directly added to the tower kettle, adjust the pH value of the kettle liquid to 7.0. The gas at the outlet of the tower top contains 40.6 g / h of acrylonitrile, and the recovery rate of acrylonitrile in the qu...

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Abstract

A suddenly cooling process for increasing the recovery rate of acrylonitrile features that the water is supplemented to the lower segment of suddenly cooling tower to control the concentration of heavy component in the liquid of tower still, the acid is directly added to the tower still for controlling the pH value to said tower still liquid, and the temp of spraying liquid is lowered.

Description

Technical field [0001] The invention relates to a quenching method for improving the recovery rate of acrylonitrile. Background technique [0002] The production of unsaturated nitriles by ammonia oxidation of hydrocarbons is an important field in the petrochemical industry. Among them, the ammonia oxidation of propylene or isobutylene to acrylonitrile or methacrylonitrile has long been industrialized. However, there is a common problem, that is, the production of unsaturated nitriles under alkaline conditions It is unstable and prone to polymerization. Therefore, regardless of the ammonia oxidation reaction, unreacted ammonia in the reaction gas must be removed. Currently, sulfuric acid is used to rapidly remove unreacted ammonia. [0003] Take the ammonia oxidation of propylene to acrylonitrile as an example: propylene, ammonia and air are ammonia oxidized through a fluidized bed reactor to produce the main product acrylonitrile and the by-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C253/34C07C255/08
Inventor 方永成顾军民熊瑾张辉吕国强
Owner CHINA PETROLEUM & CHEM CORP
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