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Quick cooling method for allyl nitrile

A technology of acrylonitrile and rapid cooling, which is applied in the direction of purification/separation of carboxylic acid nitrile, preparation of hydrocarbon ammoxidation, etc. It can solve the problems of low recovery rate of acrylonitrile and uneven spraying, so as to improve the recovery rate, improve the ammonia removal effect, Improved mass and heat transfer

Inactive Publication Date: 2003-05-21
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 existence in the previous literature that the acidic ammonium salt waste liquid must be directly buried in deep to improve the recovery rate of acrylonitrile or that the spraying is not uniform due to the internal components of the quenching tower, so that the local area is strongly alkaline. property, causing the defect of low recovery rate of acrylonitrile, providing a new quenching method for acrylonitrile

Method used

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  • Quick cooling method for allyl nitrile
  • Quick cooling method for allyl nitrile
  • Quick cooling method for allyl nitrile

Examples

Experimental program
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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 lower section is 31.9 ml / min, and the sewage discharge is 0.4 ml / min. The circulating spray volume of the upper stage is 123.6 ml / min, sulfuric acid is directly added to the liquid collecting tray, the pH value of the circulating liquid is controlled to be 3.5, the gas at the top outlet contains 39.4 g / h of acrylonitrile, and the recovery rate of acrylonitrile in the quenching tower is 93.8 %. [Example 2]

Embodiment 2

[0025]The reaction gas entering the quench tower contains 42 grams of acrylonitrile per hour, the temperature is 210°C, the upper section is 5 theoretical trays, and the lower section is 2 theoretical trays. The top operating pressure of the quench tower is 0.036Mpa, and the top temperature is 82°C. The temperature is 82°C, the spray volume of the lower stage circulation is 31.9 ml / min, and the sewage discharge rate is 0.4 ml / min. The circulating spray volume of the upper section is 123.6 ml / min, sulfuric acid is added to the replenishing water of the upper section, and then added to the liquid collection tray, the pH value of the circulating liquid is controlled to be 3.0, and the gas at the outlet of the tower top contains 39.5 g / h of acrylonitrile. The recovery rate of acrylonitrile was 94.0%. [Example 3]

Embodiment 3

[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 lower circulating spray volume is 31.9 ml / min, and the sewage discharge rate is 0.4 ml / min. The amount of spray liquid in the upper stage circulation is 123.6 milliliters per minute, and a stream of 12.7 milliliters per minute is extracted from the circulating liquid in the upper stage. The pH value of the circulating liquid was controlled to be 3.5, the gas at the top outlet contained 39.4 g / h of acrylonitrile, and the recovery rate of acrylonitrile in the quenching tower was 93.8%. 【Example 4】

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Abstract

The present invention relates to an acrylonitrile quenching method. It is characterized by that in the upper portion of quench tower the acid or acid after which is mixed with external circulating liquor of upper portion can be directly added on the liquor-collecting disk of the upper portion, and the pH value of the external circulating liquor is controlled at 2-5 so as to solve the problem of raising acrylonitrile yield.

Description

technical field [0001] The invention relates to a method for rapidly cooling acrylonitrile, in particular to a method for rapidly cooling 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 acrylo...

Claims

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Application Information

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IPC IPC(8): C07C253/24C07C253/34
Inventor 方永成顾军民张辉韩诚康吕国强
Owner CHINA PETROLEUM & CHEM CORP
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