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Method for preparing high-purity acrylonitrile

An acrylonitrile, high-purity technology, applied in the preparation of hydrocarbon ammoxidation, purification/separation of carboxylic acid nitrile, organic chemistry, etc., can solve the problems of inability to react, decrease of hydratase activity, shortening of reaction batches, etc., and achieve the solution of low temperature The effect of poor solubility

Pending Publication Date: 2020-01-24
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, at present, when some acrylonitrile manufacturers use existing acrylonitrile for synthesis, they are prone to problems such as reduced hydratase activity, shortened reaction batches or even inability to react; the prepared acrylamide cannot be used for high molecular weight (molecular weight greater than 25 million) synthesis of polyacrylamide, therefore, it is necessary to develop an acrylonitrile suitable for high-end acrylamide production needs
[0010] CN103804226B mainly reduces the content of oxazole in acrylonitrile by changing the material of the acrylonitrile unit at the outlet of the finished product tower and adding a condensation recovery unit at the same time. Patent 102199104B mainly controls the temperature, pressure and number of plates through the process of the acrylonitrile unit , reflux ratio and other parameters are controlled to reduce the impurity content in acrylonitrile; the above patents only adjust part of the process, which only reduces the impurity content in acrylonitrile, without considering the hydration and polymerization of acrylamide by the defoamer residue Impact

Method used

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  • Method for preparing high-purity acrylonitrile
  • Method for preparing high-purity acrylonitrile
  • Method for preparing high-purity acrylonitrile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The ammonia nitrogen ratio is 1.0, the pH of the upper part of the quench tower is 3, the pH of the lower end of the quench tower is 8, the pH of the large cycle is 6.5, the temperature of the recovery tower is controlled at 75°C, the pH of the acrylonitrile of the finished product tower is controlled at 6.3, and the type of defoamer contains 1 %polyoxypropylene ether of polyoxyethylene, the molecular weight of the defoamer is 3500, the molecular weight distribution is 1.0, the addition of the defoamer is controlled to be 10ppm, and the acrolein content in the finally obtained acrylonitrile is 12ppm, and the oxazole content is 4ppm. The total cyanide content is 1ppm, and the residual amount of defoamer is 7ppm.

Embodiment 2

[0035] The ammonia nitrogen ratio is 1.2, the pH of the upper part of the quench tower is 4, the pH of the lower end of the quench tower is 9, the pH of the large cycle is 7.5, the temperature of the recovery tower is controlled at 85°C, the pH of the acrylonitrile in the finished tower is controlled at 7, and the type of defoamer contains 5 The polyoxypropylene ether of % polyoxyethylene, the molecular weight of defoamer is 4000, and molecular weight distribution is 1.2, and defoamer addition control is 20ppm, and the acrolein content in the acrylonitrile that finally obtains is 14ppm, and oxazole content is 7ppm, The total cyanide content is 5ppm, and the residual amount of defoamer is 9ppm.

Embodiment 3

[0037] The ammonia nitrogen ratio is 1.1, the pH of the upper section of the quench tower is 5, the pH of the lower end of the quench tower is 8, the pH of the large cycle is 7, the temperature of the recovery tower is controlled at 80°C, the pH of the acrylonitrile in the finished tower is controlled at 6.6, and the type of defoamer contains 2 %polyoxypropylene ether of polyoxyethylene, the molecular weight of the defoamer is 3700, the molecular weight distribution is 1.1, the addition of the defoamer is controlled to be 6ppm, and the acrolein content in the finally obtained acrylonitrile is 10ppm, and the oxazole content is 6ppm, The total cyanide content is 3ppm, and the residual amount of defoamer is 8ppm.

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Abstract

The invention relates to a method for preparing high-purity acrylonitrile and belongs to the technical field of preparation of acrylonitrile. According to the method for preparing the high-purity acrylonitrile, disclosed by the invention, propylene, ammonia and air are fed into a fluidized-bed catalytic reactor for a catalytic reaction by adopting an Sohio method, terminal group esterification modified polyoxyethylene-containing polyoxypropylene ether is added as an antifoamer during the reaction, the addition amount of the antifoamer is 10ppm to 20ppm, and the hourly output of the acrylonitrile is taken as a reference. According to the method, the design is scientific and reasonable, the influence on hydration of the acrylonitrile and polymerization of acrylamide caused by minor components in the acrylonitrile and the remaining antifoamer is lowered, and thus, industrial production is facilitated.

Description

technical field [0001] The invention relates to a method for preparing high-purity acrylonitrile, which belongs to the technical field of acrylonitrile preparation. Background technique [0002] Acrylonitrile (AN) is an important monomer for synthetic fibers, synthetic rubber and synthetic resins. In recent years, with the development of acrylonitrile downstream products such as polyacrylonitrile fiber, acrylonitrile-butadiene-styrene plastic, nitrile rubber, nitrile latex, acrylamide and hexamethylenediamine, especially the development of new downstream fine chemical products With continuous development and application, the demand for acrylonitrile in the world is constantly increasing. [0003] Today, more than 95% of the world's acrylonitrile is produced by the Sohio method. In this process, chemical grade propylene (the mass fraction of propylene is not less than 93%), fertilizer grade ammonia and air are sent into the fluidized bed catalytic reactor according to the r...

Claims

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Application Information

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IPC IPC(8): C07C253/26C07C253/34C07C255/08
CPCC07C253/34C07C253/26C07C255/08
Inventor 张勇张沛存任林刚郭卫东严婕李留忠车万里
Owner CHINA PETROLEUM & CHEM CORP
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