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Method for electrosynthesis of adiponitrile by using dimensionally stable anode

A technology of adiponitrile and electrosynthesis, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of easy corrosion of the anode, limitation of electrode material forming and processing performance, contamination of the cathode, etc.

Inactive Publication Date: 2011-05-18
山东润兴化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these anti-corrosion measures cannot eradicate the defects that the Fe anode is easily corroded and the cathode is polluted.
BASF uses coated PbO 2 Graphite as the anode material for electrosynthesis of ADN can eliminate the corrosion of the anode, but the forming and processing performance of the electrode material is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The electrolyte is pumped into the filter through the electrolyte circulation pump, and after filtration, it enters the non-diaphragm electrolyzer of polypropylene material for electrolysis; the electrolyte contains 5% (mass percentage, the same below) of AN, 8% of hydrogen phosphate Sodium is used as a supporting electrolyte, 2% sodium EDTA is used as a buffer for the pH value of the electrolyte, 5% tetrabutylammonium phosphate is used as a guide ion source, and the rest is water. Use phosphoric acid or sodium hydroxide (or potassium hydroxide) to adjust the pH value of the electrolyte to around 7.

[0014] Titanium is used as the substrate, DSA coated with oxides such as ruthenium, iridium, and tantalum is used as the anode, and Cd is used as the cathode. The anode and the cathode are flat plates with equal areas. Insert the electrode pair into the electrolyte solution, and the effective area of ​​the cathode is 37.0cm×2.25cm.

[0015] At 50°C, the current density is...

Embodiment 2

[0018] In the non-diaphragm type electrolyzer of polypropylene material, electrolyte solution is loaded into, and electrolyte solution preparation is the same as embodiment 1; Adopt titanium as base material, the DSA that coats oxides such as ruthenium, iridium, tantalum does anode, uses Pb as cathode, Insert the electrode pair into the electrolyte. The anode and the cathode are flat plates with the same area, and the effective area of ​​the cathode is 28.0cm×9.5cm.

[0019] The current density is 1600A·m -2 The direct current is electrolyzed, and all the other operation steps and conditions are the same as embodiment 1. After 48 hours of continuous electrolysis, the yields of the final product ADN and by-product PCN are respectively: y(ADN)=80.1% and y(PCN)=4.8%, and the current efficiency η=77.7%.

Embodiment 3

[0021] The same operation as in Example 1, except that the formula of the electrolyte is: containing 3% AN, 15% dipotassium hydrogen phosphate, 5% potassium EDTA and 1% tetraethylammonium phosphate, the rest is water, with phosphoric acid and potassium hydroxide Adjust the pH value of the electrolyte to 8-9.

[0022] DSA is the anode, Pb is the cathode, and the effective size of each electrode plate is 28.0cm×9.5cm. At 35°C, pass a current density of 1200A m -2 direct current for the electrosynthesis reaction. Through continuous electrolysis for 24 hours, the yields of the final product ADN and by-product PCN were y(ADN)=82.7% and y(PCN)=6.8%, respectively. The total current efficiency η=87.4%.

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Abstract

The invention relates to a method for electrosynthesis of adiponitrile by using a dimensionally stable anode. The method comprises the following steps of: carrying out electrosynthesis of the adiponitrile in a non-diaphragm type electrolytic bath by utilizing titanium as a substrate, utilizing the dimensionally stable anode coated with oxides, such as ruthenium, iridium, tantalum and the like as an anode and utilizing plumbum or cadmium as a cathode; introducing a direct current of 500 A.m-2-3,000A.m-2 at the temperature of 20-60 DEG C for electrolysis; and maintaining the flow rate of interelectrode electrolytes to be more than 1m.s<-1>, wherein the electrolytes contain 0.5-7% by mass of acrylonitrile, 5-20% by mass of potassium phosphate, sodium phosphate, acid type potassium phosphate or acid type sodium phosphate as supporting electrolytes, 0.1-5.0% by mass of buffer, 0.1-10.0% by mass of guiding ion source quaternary ammonium salt and the balance of water, the pH value of the electrolyte is 6-10. An organic phase containing a product of adiponitrile, a by-product of propionitrile and a raw material AN (Acrylic Nitrile) which does not participate in the reaction is generated from electrolysis. The adiponitrile and the propionitrile are obtained from the organic phase through rectification. The method overcomes the defect of easy corrosion of the anode in the electrolysis, the yield of the adiponitrile reaches more than 80%, and the current efficiency is more than 75%.

Description

Technical field: [0001] The invention relates to a method for electrosynthesizing adiponitrile by using a shape-stable anode, and belongs to the field of organic chemical product production. Background technique: [0002] Adiponitrile (ADN) is an important chemical product with a wide range of uses. It is mainly used in the production of nylon, rubber additives, herbicides and high-grade paints. It can also be used as an extraction agent for the extraction of aromatics. It has a wide range of uses. [0003] As early as the 1960s, the research group led by M.M.Baizer successfully used stainless steel or carbon steel as the anode and cadmium as the cathode to electrolyze acrylonitrile (AN) to synthesize adiponitrile (ADN). However, if stainless steel or carbon steel is used as the anode, the Fe, Ni and other components contained in the anode will be dissolved and deposited on the cathode during the electrolysis process, thereby changing the electrochemical performance of the c...

Claims

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Application Information

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IPC IPC(8): C25B3/10C25B11/10C25B3/29
Inventor 冯柏成管宪文王光信王建马向前张华伟
Owner 山东润兴化工科技有限公司
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