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Electrolyte and method for preparing adiponitrile by electrolytic acrylonitrile dimerization

A technology of acrylonitrile and electrolyte, applied in the direction of electrolysis process, electrolysis components, electrolysis organic production, etc., can solve the problems of corrosion electrolyte, poor stability, consumption, etc., and achieve the effect of reducing corrosion and stabilizing properties

Active Publication Date: 2018-09-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the problems of strong corrosion and poor stability of the quaternary ammonium salt type supporting electrolyte used in the prior art, the purpose of the present invention is to provide an ionic liquid with high conductivity, good stability and corrosion inhibition function as a support A method for preparing adiponitrile by electrolytic dimerization of acrylonitrile in the electrolyte, improving the yield and electrolysis efficiency of adiponitrile, and solving the corrosion problem of anode materials and crude product separation equipment and the consumption of electrolyte

Method used

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  • Electrolyte and method for preparing adiponitrile by electrolytic acrylonitrile dimerization
  • Electrolyte and method for preparing adiponitrile by electrolytic acrylonitrile dimerization
  • Electrolyte and method for preparing adiponitrile by electrolytic acrylonitrile dimerization

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Experimental program
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Effect test

Embodiment 1

[0025] The electrolytic solution is prepared, and the electrolytic solution is composed of: 7wt% acrylonitrile, 2wt% ionic liquid [BMIm][H 2 PO 4 ], the EDTA sodium salt of 3wt%, the sodium hydrogen phosphate of 8wt%, all the other are water.

[0026] The electrolysis is carried out in a diaphragmless electrolytic cell, the anode material of the electrolytic cell is carbon steel, the cathode material is cadmium, and the effective size of each electrode plate is 50×3cm 2 .

[0027] The electrolysis conditions are: the temperature of the electrolyte is 40°C, and the linear velocity of the electrolyte between the electrode plates is 1m·s -1 , with a current density of 1500A m -2 .

[0028] After 24 hours of electrolysis, the yield of adiponitrile was 87.9%, and the current efficiency was 93.8%. Continuous electrolysis for 650h does not need to replenish ionic liquid.

Embodiment 2

[0030] Prepare the electrolyte, the composition of the electrolyte is: 2wt% acrylonitrile, 5wt% ionic liquid [BMIm][BF 4 ], 5wt% EDTA sodium salt, 15wt% potassium phosphate, and the rest are water.

[0031] The electrolysis is carried out in a diaphragmless electrolytic cell, the anode material of the electrolytic cell is carbon steel, the cathode material is cadmium, and the effective size of each electrode plate is 50×3cm 2 .

[0032] The electrolysis conditions are: the temperature of the electrolyte is 60°C, and the linear velocity of the electrolyte between the electrode plates is 1m·s -1 , with a current density of 4000A m -2 .

[0033] After 24 hours of electrolysis, the yield of adiponitrile was 85.1%, and the current efficiency was 91.2%. Continuous electrolysis for 650h does not need to replenish ionic liquid.

Embodiment 3

[0035]Prepare the electrolyte, the composition of the electrolyte is: 5wt% acrylonitrile, 5wt% ionic liquid [BPy][HSO 4 ], 0.1wt% potassium salt of EDTA, 5wt% sodium dihydrogen phosphate, and the rest are water.

[0036] The electrolysis is carried out in a diaphragmless electrolytic cell, the anode material of the electrolytic cell is graphite, the cathode material is lead, and the effective size of each electrode plate is 50×3cm 2 .

[0037] The electrolysis conditions are: the temperature of the electrolyte is 20°C, and the linear velocity of the electrolyte between the electrode plates is 1.2m s -1 , with a current density of 500A m -2 .

[0038] After 48 hours of electrolysis, the yield of adiponitrile was 86.3%, and the current efficiency was 92.5%. Continuous electrolysis for 650h does not need to replenish ionic liquid.

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Abstract

The invention relates to an electrolyte and a method for preparing adiponitrile by electrolytic acrylonitrile dimerization. The electrolyte comprises 2-7 wt% of acrylonitrile, 0.1-5 wt% of imidazole or pyridine ionic liquid, 0.1-5 wt% of EDTA or EDTA salt, 5-15 wt% of phosphate and the balance water, and the pH value range is 7-10. Electrolysis is carried out in a membrane-free electrolytic cell,anode materials of the membrane-free electrolytic cell are carbon steel or graphite, and cathode materials are cadmium or lead, the temperature of the electrolyte is 20-60 DEG C, and the linear speedof the electrolyte between the electrode plates is larger than 1 m.s <-1>, continuous electrolysis is carried out under the condition that the current density is 500-4000 A.m <-2>, and oil-water separation, rectification and other processes are carried out to obtain adiponitrile products. Compared with the prior art, ionic liquid is adopted as the support electrolyte, so that the yield and currentefficiency of adiponitrile can be improved, and the corrosion of the anode material and the crude product separation equipment can be greatly reduced; and the property of the ionic liquid is stable,so that the loss of the electrolyte can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of the chemical industry, and relates to a method for preparing adiponitrile by electrolytic dimerization of acrylonitrile, in particular to an electrolyte for preparing adiponitrile by electrolytic dimerization of acrylonitrile and the preparation of adiponitrile by electrolytic dimerization of acrylonitrile. Nitrile method. Background technique [0002] Adiponitrile (ADN), also known as 1,4-dicyanobutane, has the molecular formula NC(CH 2 ) 4 CN is an important organic chemical raw material. Hexamethylenediamine is obtained by hydrogenation and reduction of adiponitrile. Hexamethylenediamine and adipic acid produce nylon 66 through polycondensation reaction. This is the most important industrial use of adiponitrile. Currently, more than 90% of adiponitrile in the world is used as nylon 66 raw materials. Hexamethylenediamine can also obtain HDI (1,6-diisocyanate) through photochemical reaction, and HDI ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/10C25B3/29
CPCC25B3/295
Inventor 罗辉高静洁范维玉南国枝
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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