Method and device for maintaining activity of electrolyte during process of acrylonitrile electrolysis for preparing adiponitrile

An electrolyte and adiponitrile technology, which is applied in electrolysis process, electrolysis components, electrolysis organic production, etc., can solve the problem of reducing the continuous use time of acrylonitrile electrolytic cells, changing the electrolytic characteristics of acrylonitrile electrolytic cells, and reducing the yield of adiponitrile products. Problems such as efficiency and current efficiency can be achieved to prolong the continuous use time, improve product yield and current efficiency, and reduce the concentration of metal ions

Inactive Publication Date: 2016-03-23
CHONGQING UNISPLENDOUR INT CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the metal ion concentration reaches a certain level, it will be precipitated on the cathode, which will change the electrolytic characteristics of the acrylonitrile electrolytic cell, reduce the yield of adiponitrile product and current efficiency, and also reduce the continuous use time of the acrylonitrile electrolytic cell

Method used

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  • Method and device for maintaining activity of electrolyte during process of acrylonitrile electrolysis for preparing adiponitrile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Such as figure 1 As shown, the device for maintaining the electrolyte activity in the process of preparing adiponitrile by electrolysis of acrylonitrile includes an iron-removing electrolytic cell 1 and an electrolyte pump 4. The feed port of the iron-removing electrolytic cell 1 is separated from gas and liquid by the electrolyte pump 4 The lower part of the device 2 is connected, and the discharge port of the iron removal electrolytic cell 1 is connected to the middle part of the gas-liquid separator 2; the iron removal electrolytic cell 1 is a monopolar electrolytic cell; the anode of the iron removal electrolytic cell 1 is titanium Base insoluble anode, cathode material is titanium.

[0024] The method for maintaining the electrolyte activity in the process of preparing adiponitrile by electrolysis of acrylonitrile includes the following steps:

[0025] (1) After the electrolyte flows into the gas-liquid separator 2 for gas-liquid separation, part of the electrolyte is ...

Embodiment 2

[0030] Such as figure 1 As shown, the device for maintaining the electrolyte activity in the process of preparing adiponitrile by electrolysis of acrylonitrile includes an iron-removing electrolytic cell 1 and an electrolyte pump 4. The feed port of the iron-removing electrolytic cell 1 is separated from gas and liquid by the electrolyte pump 4 The lower part of the device 2 is connected, and the discharge port of the iron removal electrolytic cell 1 is connected to the middle part of the gas-liquid separator 2; the iron removal electrolytic cell 1 is a monopolar electrolytic cell; the anode of the iron removal electrolytic cell 1 is titanium Base insoluble anode, cathode material is carbon steel.

[0031] The method for maintaining the electrolyte activity in the process of preparing adiponitrile by electrolysis of acrylonitrile includes the following steps:

[0032] (1) After the electrolyte flows into the gas-liquid separator 2 for gas-liquid separation, part of the electrolyte...

Embodiment 3

[0037] Such as figure 1 As shown, the device for maintaining the electrolyte activity in the process of preparing adiponitrile by electrolysis of acrylonitrile includes an iron-removing electrolytic cell 1 and an electrolyte pump 4. The feed port of the iron-removing electrolytic cell 1 is separated from gas and liquid by the electrolyte pump 4 The lower part of the device 2 is connected, and the discharge port of the iron removal electrolytic cell 1 is connected to the middle part of the gas-liquid separator 2; the iron removal electrolytic cell 1 is a bipolar electrolytic cell; the anode of the iron removal electrolytic cell 1 is platinum Base insoluble anode, cathode material is titanium.

[0038] The method for maintaining the electrolyte activity in the process of preparing adiponitrile by electrolysis of acrylonitrile includes the following steps:

[0039] (1) After the electrolyte flows into the gas-liquid separator 2 for gas-liquid separation, part of the electrolyte is di...

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Abstract

The invention discloses a method and device for maintaining the activity of electrolyte during the process of acrylonitrile electrolysis for preparing adiponitrile. The method comprises the following steps: introducing part of electrolyte to an iron-removing electrolytic tank, carrying out electrolysis to remove metal ions, and returning the electrolyte to the main circulation. The device comprises an iron-removing electrolytic tank and an electrolyte pump; the material inlet of the iron-removing electrolytic tank is communicated with the lower part or bottom of a gas-liquid separator through the electrolyte pump; and the material outlet of the iron-removing electrolytic tank is communicated with the middle part or upper part of the gas-liquid separator. The provided method and device can reduce the metal ion concentration of electrolyte, the precipitation of metal ions on the negative electrode is reduced, thus the yield of adiponitrile product is increased, the current efficiency is improved, and the continuous using time of acrylonitrile electrolytic tank is prolonged.

Description

Technical field [0001] The invention relates to the technical field of the preparation of adiponitrile, in particular to a method and a device for maintaining electrolyte activity in the process of preparing adiponitrile by electrolysis of acrylonitrile. Background technique [0002] Adiponitrile, also known as 1,4-dicyanobutane, is an important chemical raw material. It is mainly used to prepare hexamethylene diamine as the intermediate of polyamide nylon 66 salt. It can also be used to prepare rubber additives and kill Insect agents and fungicides, rocket fuel, polymer materials; can also be used as plasticizers, additives, colorants, textile auxiliaries, solvents and extractants for aromatics extraction, etc.; in addition, they are also used in analytical chemistry and electroplating industries Certain uses. [0003] In 1965, Monsanto first realized the industrialization of adiponitrile (ADN) by electrolysis of acrylonitrile (AN) by diaphragm method. A sulfonated polystyrene r...

Claims

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Application Information

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IPC IPC(8): C25B15/08C25B3/10C25B3/29
CPCC25B15/08C25B3/29
Inventor 王飞肖雷范倩玉陈薛强王理姜国富冷方蓉姚如杰郑道敏周普路茁壮
Owner CHONGQING UNISPLENDOUR INT CHEM
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