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A kind of adiponitrile rectification purification system and its rectification purification method

A purification method and a technology for adiponitrile, applied in the field of adiponitrile separation, can solve the problems affecting the product quality and unit consumption of hexamethylenediamine, poor product quality, long process flow, etc., and achieve good product quality, improved stability, The effect of short process flow

Active Publication Date: 2021-03-02
SEDIN NINGBO ENG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing separation method of adiponitrile has a long process flow, small and many equipment, complicated operation, and poor product quality, which affects the subsequent product quality and unit consumption of hexamethylenediamine.

Method used

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  • A kind of adiponitrile rectification purification system and its rectification purification method

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Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0026] A kind of adiponitrile rectifying purification system, such as figure 1 As shown, it includes light removal tower feed preheater 1, light removal tower feed tank 2, light removal tower 3, light removal tower top reflux tank 4, light removal tower top condenser 5, constant liquid level tank 6, light Component buffer tank 8, light component crystallizer 9, weight removal tower 10, weight removal tower top condenser 11, vacuum separator 12 and adiponitrile cooler 13;

[0027] The feed preheater 1 of the light removal tower is connected with the feed tank 2 of the light removal tower, the feed tank 2 of the light removal tower is connected with the middle section feed port of the light removal tower 3, and the light component outlet of the light removal tower 3 is connected with the The top feed port of the light removal tower top condenser 5 is connected, the bottom outlet of the light removal tower top condenser 5 is connected with the top inlet of the constant liquid lev...

specific Embodiment 2

[0032] A kind of adiponitrile rectification purification method, such as figure 1 shown, including the following steps:

[0033] (1) Lightening components

[0034]Store in anhydrous adiponitrile storage tanks containing adiponitrile, delta-cyanovaleric acid, delta-cyanovaleric acid ammonium, iminocyanocyclopentane, 2-pentyl-1-amino-5 , 6-trimethypyrimidine, 2-amino(3,4-5,6)-bistrimethenylpyridine and other crude adiponitrile raw materials are heated to 170- After 220°C, it is sent to the feed tank 2 of the light removal tower, and then enters the middle section of the light removal tower 3 by gravity (the light removal tower 3 is a decompression operation, equipped with 44 layers of sieve plates, and is controlled by a pressure regulating valve with a high pressure alarm. Control, the middle section of the light removal tower 3 that enters is the 23rd, 25th and 27th floor trays of the light removal tower 3), the top operating pressure of the light removal tower 3 is controll...

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Abstract

The invention discloses an adiponitrile rectification and purification system and a rectification and purification method thereof. The adiponitrile rectification and purification system is characterized by comprising a feeding pre-heater of a light-component removal tower, a feeding tank of the light-component removal tower, the light-component removal tower, a top refluxing tank of the light-component removal tower, a top condenser of the light-component removal tower, a constant liquid level tank, a light-component buffering tank, a light-component crystallization device, a top condenser ofa heavy-component removal tower, a vacuum separator and an adiponitrile cooler; the rectification and purification method comprises the following steps: (1) after treating a crude adiponitrile raw material through the pre-heater, conveying into the light-component removal tower and separating and purifying, so as to obtain light-component-removed adiponitrile with the purity of 97 to 99 weight percent; (2) dissolving, cooling and crystallizing a condensed solution in the light-component buffering tank to obtain a suspended mixed solution; after filtering, collecting in a filtrate storage tank;(3) conveying adiponitrile with the purity of 97 to 99 weight percent into the heavy-component removal tower and separating and purifying; discharging an adiponitrile product with the purity of 99.999 weight percent. The adiponitrile rectification and purification system and the rectification and purification method thereof have the advantages of high yield, good product quality and low energy consumption.

Description

technical field [0001] The invention relates to separation of adiponitrile, in particular to an adiponitrile rectification purification system and a rectification purification method thereof. Background technique [0002] Adiponitrile is a colorless oily liquid with a slight odor and stable properties. It is mainly used in the production of polyamide fiber intermediate hexamethylene diamine, rubber accelerator and antirust agent. During production operation, the crude adiponitrile produced by the reaction is mixed with water in the washing tank and washed, condensed with a condenser, and then filtered and decanted to remove water-insoluble by-products. The crude nitrile is sent to the dehydrator after being preheated by the preheater, and the water in the crude adiponitrile is removed by steam heating and nitrogen circulation. The anhydrous adiponitrile is sent to the rectification tower, and the light component and heavy component are removed through separation and purifi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C253/34C07C255/04
CPCC07C253/34C07C255/04
Inventor 刘新安周晓燕陈发挥李全李国华余爱平徐垚英何丹丹梁玉超毛远方张巧琼娄哲翔卫维剑孟启贵陈恩之姜曦赵风轩谢毅张楠
Owner SEDIN NINGBO ENG