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Anode Coatings for Ion Membrane Electrolyzers

An ion-exchange membrane electrolyzer and anode coating technology, applied in the direction of electrodes, electrolysis components, electrolysis process, etc., can solve the problems of affecting the purity of chlorine gas, the decrease of current efficiency, and the short life of electrodes, so as to achieve electrode cost control, stable performance, and catalytic powerful effect

Active Publication Date: 2021-02-09
宏泽(江苏)科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0025] In chlor-alkali production, the traditional titanium-based ruthenium-titanium coating has been tested in production practice, and its defects are found to be: the electrode life is short, and the oxygen content in the produced chlorine gas is too high, which affects the purity of chlorine gas and causes a decrease in current efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094]Titanium mesh substrate: mesh pitch 3*6mm, thickness 1mm;

[0095]Coating solution for anode coating: ruthenium trichloride, iridium tetrachloride, chloroplatinic acid, titanium tetrachloride and hydrochloric acid aqueous solution, and formulating raw materials according to the atomic percentage of Ru43:Ir9:Pt8:Ti40;

[0096]The final quality ratio of each raw material used is calculated as follows:

[0097]Ruthenium trichloride: iridium tetrachloride: chloroplatinic acid: titanium tetrachloride=88.3:15.7:16.8:158.7.

[0098]Production of anode coating: 10 cycles of spraying, drying and sintering, each spraying volume is 55-60ml / m2, Weigh after each sintering, the weight will increase by 3.5-4g / m2After the last sintering, the total spraying weight gain on the titanium mesh substrate is 35-40g / m2.

[0099]Product test indicators:

[0100]1. Detection result of chlorine evolution potential: 1.09V-1.10V (index: current density 4KA / ㎡, saturated brine, temperature 90℃±1℃, ≤1.13V VS SCE);

[0101]2. Res...

Embodiment 2

[0105]Titanium mesh substrate: mesh pitch 3.5*6mm, thickness 1mm;

[0106]Coating solution for anode coating: solid ruthenium trichloride, titanium tetrachloride, iridium tetrachloride, zirconium chloride, platinum chloride and ethylene glycol-butyl ether, according to Ru37:Ir15:Pt6:Ti39:Zr3 : The atomic percentage of the formula material,

[0107]The final quality ratio of each raw material used is calculated as follows:

[0108]Ruthenium trichloride: iridium tetrachloride: platinum chloride: titanium tetrachloride: zirconium chloride = 76.0: 26.1: 12.6: 154.8: 7.7.

[0109]Production of anode coating: 10 cycles of spraying, drying and sintering, each spraying volume is 45-50ml / m2, Weigh after each sintering, the weight will increase by 2.8-3.5g / m2After the last sintering, the total spraying weight gain on the titanium mesh substrate is 28-35g / m2.

[0110]Product test indicators:

[0111]1. Detection result of chlorine evolution potential: 1.10V-1.12V (index: current density 4KA / ㎡, saturated brine, ...

Embodiment 3

[0115]Titanium mesh substrate: mesh pitch 4.5*8mm mm, thickness 1mm;

[0116]Coating solution for anode coating: solid ruthenium trichloride, chloroiridic acid, chloroplatinic acid, titanium tetrachloride, palladium chloride and n-butanol. The formula is composed according to the atomic percentage of Ru40:Ir12:Pt9:Ti35:Pd4 material;

[0117]The final quality ratio of each raw material used is calculated as follows:

[0118]Ruthenium trichloride: chloroiridic acid: chloroplatinic acid: titanium tetrachloride: palladium chloride = 82.1: 20.9: 18.9: 138.9: 26.3.

[0119]Production of anode coating: 10 cycles of spraying, drying and sintering, each spraying volume is 40-45ml / m2, Weigh after each sintering, the weight will increase by 3-3.5g / m2After the last sintering, the total spraying weight gain on the titanium mesh substrate is 30-35g / m 2 .

[0120] Product test indicators:

[0121] 1. Detection result of chlorine evolution potential: 1.10V-1.12V (index: current density 4KA / ㎡, saturated brine, te...

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Abstract

The invention relates to an anode coating for an ion membrane electrolyzer, which is characterized in that its formula is a combined formula of ruthenium, iridium, platinum and titanium, in which the ruthenium content is 35-45 mol%, the iridium content is 5-15 mol%, and the platinum content is 5-10 mol%, titanium content 35-45 mol%, the formula can also contain other additives less than 4% mol%, other additives are zirconium chloride or palladium chloride. The anode coating for ion membrane electrolyzers of the present invention is used for active anodes to meet the following requirements: high oxygen evolution potential, strong catalytic ability, high conductivity, and difficulty in oxygen evolution side reactions; stable performance, corrosion resistance, long life, and electrode After failure, it can be recoated and continued to be used; the cost of the electrode is effectively controlled; improving product quality requires high purity of chlorine and low oxygen content.

Description

Technical field[0001]The invention relates to an anode coating for an ion-exchange membrane electrolyzer. Specifically, it relates to a noble metal oxide coating that can be suitable for use in ion-exchange membrane electrolyzers used in the chlor-alkali industry to electrolyze salt water titanium-based anodes.Background technique[0002]The chlor-alkali industry is a basic chemical industry. At present, the ion-exchange membrane method is used to produce soda, that is, the production of caustic soda, chlorine, hydrogen and so on by electrolyzing brine through ion-exchange membrane electrolyzers.[0003]Anodic reaction 2Cl－-2e－=Cl2↑[0004]4OH－-4e－=O2↑+2H2O[0005]Cathodic reaction 2H2O+2e－=H2↑+2OH－[0006]The reaction of the dissolved chlorine gas with the sodium hydroxide reversed from the cathode[0007]3Cl2+6NaOH=5NaCl+NaClO3+3H2O[0008]NaClO generated3It is highly oxidizing.[0009]In the production of chlor-alkali, salt (NaCl) and electricity are the main costs. For every ton of caustic soda...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/089C25B11/081C25B11/063C25B1/46
CPCC25B1/46B01J23/468C25B11/093B01J35/33
Inventor 徐国民刘金梅
Owner 宏泽(江苏)科技股份有限公司
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