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System for removing sodium hydroxide during hexamethylenediamine production, and removal method thereof

A technology of sodium hydroxide and hexamethylene diamine, applied in the field of sodium hydroxide removal system, can solve the problems of affecting the rectification effect, reducing the aperture of the tray, and coking in the rectification tower, so as to improve the removal effect and reduce the Fluctuation, guaranteed removal effect

Inactive Publication Date: 2018-02-02
HENAN SHENMA NYLON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This separation method that relies on different specific gravity for removal is affected by load changes and short standing time of the fluid. The existing production system and production equipment cannot meet the removal conditions, and sodium hydroxide cannot be completely separated; 2. Distillation removal method: After the crude hexamethylenediamine enters the rectification system, the sodium hydroxide is removed and separated again with a decoking tower. Since sodium hydroxide is easily precipitated into solid particles when heated, it is easy to cause coking in the rectification tower. Particles attached to the tray of the rectification tower will cause the aperture of the tray to become smaller, resulting in flooding, affecting the rectification effect, shortening the operation period of the rectification tower, and affecting the normal operation of production

Method used

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  • System for removing sodium hydroxide during hexamethylenediamine production, and removal method thereof
  • System for removing sodium hydroxide during hexamethylenediamine production, and removal method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: Continuously and slowly send crude hexamethylenediamine into the crude hexamethylenediamine storage tank 1, when the sodium hydroxide liquid level height deposited at the bottom of the crude hexamethylenediamine storage tank 1 is 0.3m, the crude hexamethylenediamine storage tank Tank 1 discharges the liquid of 13 cubic meters to sodium hydroxide separation tank 4, leaves standstill the liquid in sodium hydroxide separation tank 4 for 4min, manually observes the liquid in sodium hydroxide separation tank 4 through glass sight glass 401, until sodium hydroxide After the liquid in the separation tank 4 was obviously stratified, the centrifugal pump A5 was opened to extract the sodium hydroxide and hexamethylenediamine in the sodium hydroxide separation tank 4 respectively, and the removal of the sodium hydroxide was completed.

Embodiment 2

[0027] Embodiment 2: Continuously and slowly send crude hexamethylenediamine into the crude hexamethylenediamine storage tank 1, when the sodium hydroxide liquid level height deposited at the bottom of the crude hexamethylenediamine storage tank 1 is 0.5m, the crude hexamethylenediamine storage tank Tank 1 discharges the liquid of 16 cubic meters to the sodium hydroxide separation tank 4, the liquid in the sodium hydroxide separation tank 4 is allowed to stand for 6 minutes, and the liquid in the sodium hydroxide separation tank 4 is manually observed through the glass sight glass 401 until the sodium hydroxide After the liquid in the separation tank 4 was obviously stratified, the centrifugal pump A5 was opened to extract the sodium hydroxide and hexamethylenediamine in the sodium hydroxide separation tank 4 respectively, and the removal of the sodium hydroxide was completed.

Embodiment 3

[0028] Embodiment 3: Continuously and slowly send crude hexamethylenediamine into the crude hexamethylenediamine storage tank 1, when the sodium hydroxide liquid level height deposited at the bottom of the crude hexamethylenediamine storage tank 1 is 0.4m, the crude hexamethylenediamine storage tank Tank 1 discharges the liquid of 15 cubic meters to the sodium hydroxide separation tank 4, the liquid in the sodium hydroxide separation tank 4 is allowed to stand for 5 minutes, and the liquid in the sodium hydroxide separation tank 4 is manually observed through the glass sight glass 401 until the sodium hydroxide After the liquid in the separation tank 4 was obviously stratified, the centrifugal pump A5 was opened to extract the sodium hydroxide and hexamethylenediamine in the sodium hydroxide separation tank 4 respectively, and the removal of the sodium hydroxide was completed.

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Abstract

The invention provides a system for removing sodium hydroxide during hexamethylenediamine production. A method for carrying out precipitating separation removal through using the density difference between the sodium hydroxide and the hexamethylenediamine is adopted, a crude hexamethylenediamine feeding tube of an original device is extended, the position of a hexamethylenediamine discharging tubeis elevated, and a sodium hydroxide separation tank is arranged, so the sodium hydroxide can be removed in a crude hexamethylenediamine tank, the content of the sodium hydroxide entering a rectifyingsystem is reduced, the purifying effect of a rectifying tower is guaranteed, and the running cycle is prolonged.

Description

technical field [0001] The invention relates to the technical field of hexamethylenediamine production equipment, in particular to a sodium hydroxide removal system and removal method in the production of hexamethylenediamine. Background technique [0002] In the existing production process of hexamethylenediamine, sodium hydroxide exists in the reaction system as a cocatalyst, and the sodium hydroxide in the reaction solution is removed by a sodium hydroxide decanter and then enters a crude hexamethylenediamine storage tank for use in the refining process. Restricted by the continuous process conditions of chemical production, sodium hydroxide cannot be completely removed, and the residual sodium hydroxide enters the back system in a solution state along with crude hexamethylenediamine. During the refining and purification process of crude hexamethylenediamine, with the removal of water, sodium hydroxide is precipitated into solid particles adhering to the inner wall of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C209/84C07C211/12
CPCC07C209/84C07C211/12
Inventor 赵铎陈聚良郭卫东高先明刘军强王彩霞林冰杜洪涛张敏欧玲王平白湘涛刘永王海亮张彪许洪珂
Owner HENAN SHENMA NYLON CHEM
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