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Method for producing adiponitrile through acrylonitrile electrolysis dimerization method

A technology of acrylonitrile and adiponitrile, which is applied in the field of electrolytic preparation of adiponitrile, which can solve the problems of small investment and achieve the effects of improving mass transfer, reducing concentration polarization, and good degassing effect

Inactive Publication Date: 2019-07-23
青岛中石恒润化工技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This production route has the characteristics of small investment per unit product, suitable for large-scale production, single variety of raw materials and wide sources, relatively simple technology and convenient production management, etc., such as figure 1 As shown, but since the cost of electricity and raw material acrylonitrile is the main part of the product cost composition, whether to obtain cheap electricity and low-cost acrylonitrile raw material becomes the key to the feasibility of this production route

Method used

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  • Method for producing adiponitrile through acrylonitrile electrolysis dimerization method
  • Method for producing adiponitrile through acrylonitrile electrolysis dimerization method
  • Method for producing adiponitrile through acrylonitrile electrolysis dimerization method

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Embodiment 1

[0040] A method for producing adiponitrile by electrolytic dimerization of acrylonitrile, comprising adding an electrolytic solution in an electrolytic cell 1 without a diaphragm, in the range of pH 6 to 9, at a temperature of 20 to 60°C and an electrolysis voltage of 3~7V, current density 500~3000A·m -2 Continuous electrolysis under the condition of continuous electrolysis, start the ultrasonic generator 2 at the same time of electrolysis, the electrolyte solution after electrolysis is cooled by the first cooler 3 and then enters the phase separator 5, and the water phase electrolyte is separated from the lower water phase outlet after being coalesced and stratified Go out and enter the second washing tower 6 and then return to the electrolytic tank 1, and the crude product of the oil phase enters the first washing tower 4 and washes with water to separate the double quaternary ammonium salt, the latter returns to the electrolytic tank 1, and then flows into the second washing...

Embodiment 2

[0047] The components of the electrolyte and their mass percentages are: 3% acrylonitrile, 6% adiponitrile, 5% sodium hydrogen phosphate, 5% sodium dihydrogen phosphate, 1% dipotassium EDTA, 5% Borax, 3% N, N, N, N', N', N'-hexaethylhexamethylenediamine hydrogen phosphate, 1.5% sodium pyrosulfate, 1.5% 1-butyl-3-methylimidazole Monobasic phosphate, 3% sodium 2,3-dihydroxysuccinate, balance water.

[0048] Electrolysis conditions: pH 7, temperature 40°C, electrolysis voltage 5V, current density 1500A m -2 , the ultrasonic frequency is 50kHz, and the ultrasonic intensity is 0.5W·cm -2 , the electrolysis time is the theoretical electrolysis time.

[0049] After electrolysis, the yield of adiponitrile was 91.2%, and the current efficiency was 92.1%.

[0050] All the other are with embodiment 1.

Embodiment 3

[0052] The components of the electrolyte and their mass percentages are: 5% acrylonitrile, 10% adiponitrile, 15% potassium phosphate, 2% disodium EDTA, 10% borax, 2% N, N '-Diethyl-N,N,N',N'-tetrabutylhexamethylenediamine sulfate, 3% of N,N'-diethyl-N,N,N',N'-tetrabutyloctyl Diamine sulfuric acid, 3% sodium pyrosulfate, 2% 1-butyl-3-methylimidazolium dihydrogen phosphate, 4% sodium 2,3-dihydroxysuccinate, and the rest is water.

[0053] Electrolysis conditions: pH 9, temperature 60°C, electrolysis voltage 7V, current density 3000A m -2 , the ultrasonic frequency is 80kHz, and the ultrasonic intensity is 1W·cm -2 , the electrolysis time is the theoretical electrolysis time.

[0054] After electrolysis, the yield of adiponitrile was 91.4%, and the current efficiency was 92.6%.

[0055] All the other are with embodiment 1.

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Abstract

The invention provides a method for producing adiponitrile through an acrylonitrile electrolysis dimerization method. The method comprises the following steps: adding electrolyte into a diaphragm-freeelectrolytic cell and continuously electrolyzing; in an electrolyzing process, starting an ultrasonic generator; cooling, washing and rectifying an oil-phase crude product to obtain the high-purity adiponitrile, wherein the electrolyte is prepared from the following components in percentage by mass: 0.5 to 5 percent of acrylonitrile, 0 to 10 percent of the adiponitrile, 8 to 15 percent of phosphate, 0.1 to 2 percent of EDTA (Ethylene Diamine Tetraacetic Acid) or EDTA salt, 1 to 10 percent of borax, 0.1 to 5 percent of bis-quaternary ammonium salt, 0.1 to 3 percent of sodium pyrosulfate, 1 to2 percent of 1-butyl-3-methylimidazole dihydrogen phosphate, 2 to 4 percent of sodium 2,3-dihydroxysuccinate and the balance of water. The invention further provides the electrolytic cell used for themethod. According to the method provided by the invention, an electrolysis process is strengthened by ultrasonic sounds and the electrolyte is improved and optimized, so that the yield of the adiponitrile and the current efficiency are higher; the yield of the adiponitrile is 90 percent or more and the current efficiency is 92 percent or more.

Description

technical field [0001] The invention belongs to the technical field of preparing adiponitrile by electrolysis, in particular to a method for producing adiponitrile by electrolytic dimerization of acrylonitrile. Background technique [0002] Naphtha from the refining unit is used as the starting raw material. Naphtha is subjected to catalytic cracking to obtain propylene and catalytic reforming to obtain benzene; propylene is subjected to ammoxidation to obtain acrylonitrile, and acrylonitrile is obtained through electrolytic dimerization to obtain adiponitrile and adiponitrile. Hexamethylenediamine is obtained by hydrogenation of dinitrile; cyclohexane is obtained by hydrogenation of benzene, and adipic acid is obtained by catalytic oxidation of cyclohexane; nylon 66 can be obtained by dehydration polymerization of hexamethylenediamine and adipic acid, and nylon 66 can be further obtained Engineering plastics and industrial yarns, thus forming a complete industrial chain of ...

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 满聪
Owner 青岛中石恒润化工技术有限公司
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