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Electrolytic solution used in electrolysis of acrylonitrile for preparing adiponitrile and method

An electrolyte and adiponitrile technology, applied in electrolysis process, electrolysis components, electrolysis organic production, etc., can solve the problems of quaternary ammonium salt loss, high electrode corrosion, high cost, etc., and achieve the effect of reducing consumption and electrode corrosion

Inactive Publication Date: 2016-05-04
CHONGQING UNISPLENDOUR INT CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrolyte used in this process only contains phosphate, EDTA and quaternary ammonium salt, which is highly corrosive to the electrode, and the quaternary ammonium salt used in this process has serious loss and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The components of the prepared electrolyte and their mass percentages are: 1% acrylonitrile, 3% adiponitrile, 8% disodium hydrogen phosphate, 0.2% tetrasodium EDTA, 10% borax, 0.1% N , N'-diethyl-N, N, N', N'-tetrabutylbutylene diamine phosphate, and the rest is water.

[0022] The diaphragmless electrolytic cell is a unipolar electrolytic cell, the anode material is carbon steel, the cathode material is lead, and the effective area of ​​the cathode and anode is 60cm 2 .

[0023] Synthesize adiponitrile by electrolyzing acrylonitrile in an electrolytic cell without a diaphragm. During electrolysis, the temperature of the electrolyte is 40°C, the linear velocity of the electrolyte between the plates is 1m / s, and the current density is 1000A / m 2 During electrolysis, acrylonitrile is continuously added to the electrolyte, part of the electrolyte is shunted to the oil-water stratifier to continuously separate the oil phase, the water phase is returned to the electrolytic c...

Embodiment 2

[0026] The components of the prepared electrolyte and their mass percentages are: 5% acrylonitrile, 10% adiponitrile, 15% sodium phosphate, 2% tetrasodium EDTA, 1% borax, 5% N, N '-Diethyl-N,N,N',N'-tetrabutylhexamethylenediamine phosphate, the rest is water.

[0027] The diaphragmless electrolytic cell is a unipolar electrolytic cell, the anode material is carbon steel, the cathode material is lead, and the effective area of ​​the cathode and anode is 60cm 2 .

[0028] Adiponitrile is synthesized by electrolyzing acrylonitrile in an electrolytic cell without a diaphragm. During electrolysis, the temperature of the electrolyte is 60°C, the linear velocity of the electrolyte between the plates is 1.5m / s, and the current density is 2000A / m 2 During electrolysis, acrylonitrile is continuously added to the electrolyte, part of the electrolyte is shunted to the oil-water stratifier to continuously separate the oil phase, the water phase is returned to the electrolytic cell, and th...

Embodiment 3

[0031] The components of the prepared electrolyte and their mass percentages are: 2% acrylonitrile, 5% adiponitrile, 10% sodium phosphate, 1% disodium EDTA, 5% borax, 2% N, N , N, N', N', N'-hexaethylhexamethylenediamine sulfate, and the rest is water.

[0032] The diaphragmless electrolytic cell is a bipolar electrolytic cell, the anode material is carbon steel, the cathode material is cadmium, and the effective area of ​​the cathode and anode is 120cm 2 .

[0033] Synthesize adiponitrile by electrolyzing acrylonitrile in an electrolytic cell without a diaphragm. The temperature of the electrolyte during electrolysis is 50°C, the linear velocity of the electrolyte between the plates is 2m / s, and the current density is 1500A / m 2 During electrolysis, acrylonitrile is continuously added to the electrolyte, part of the electrolyte is shunted to the oil-water stratifier to continuously separate the oil phase, the water phase is returned to the electrolytic cell, and the oil phase...

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Abstract

The invention discloses an electrolytic solution used in electrolysis of acrylonitrile for preparing adiponitrile and a method. The electrolytic solution consists of the following components in percentage by mass: 1%-5% of acrylonitrile, 0-10% of adiponitrile, 8%-15% of phosphate, 0.1%-2% of EDTA or EDTA salt, 1%-10% of borax, 0.1%-5% of biquaternary ammonium salt and the balance of water. The electrolytic solution is added into a non-membrane electrolytic cell, so that the adiponitrile is prepared by electrolysis. The biquaternary ammonium salt and the borax are added into the electrolytic solution, so that electrode corrosion during electrolysis is reduced, and the selectivity and the current efficiency of the acrylonitrile are higher than 90%; and moreover, the consumption of the biquaternary ammonium salt is reduced, so that the content of the propionitrile is kept at a relatively low level while the propionitrile is continuously used for 400 hours without being supplemented.

Description

technical field [0001] The invention relates to the technical field of preparation of adiponitrile, in particular to an electrolyte and a method for preparing adiponitrile by electrolysis of acrylonitrile. Background technique [0002] Adiponitrile, also known as 1,4-dicyanobutane, is an important chemical raw material, mainly used to prepare polyamide nylon 66 salt intermediate hexamethylenediamine, and can also be used to prepare rubber additives, Insecticides and fungicides, rocket fuels, polymer materials; can also be used as plasticizers, additives, colorants, textile auxiliaries, solvents and extraction agents for aromatics extraction; in addition, in analytical chemistry and electroplating industries Certain uses. [0003] In 1965, Monsanto first realized the industrialization of adiponitrile by electrolysis of acrylonitrile by membrane method. A cation exchange membrane of the sulfonated polystyrene resin type is used as a diaphragm, a lead-silver alloy is used as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/10C25B15/08C25B3/29
CPCC25B15/08C25B3/29
Inventor 王飞韩元璋肖雷姚如杰郑道敏王理姜国富张森
Owner CHONGQING UNISPLENDOUR INT CHEM
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