Positive pole coating for ion membrane electrolysis bath

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

Active Publication Date: 2019-10-11
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 el

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0094] Example 1:

[0095] Titanium mesh base material: mesh pitch 3*6mm, thickness 1mm;

[0096] The coating solution of anode coating: ruthenium trichloride, iridium tetrachloride, chloroplatinic acid, titanium tetrachloride and hydrochloric acid aqueous solution, according to the atomic percentage of Ru43:Ir9:Pt8:Ti40 to form formula raw materials;

[0097] The final mass ratio of each raw material used is calculated as follows:

[0098] Ruthenium trichloride: iridium tetrachloride: chloroplatinic acid: titanium tetrachloride = 88.3: 15.7: 16.8: 158.7.

[0099] Production of anode coating: 10 cycles of spraying, drying and sintering, each spraying amount is 55-60ml / m 2 , weighed after each sintering, the weight increased by 3.5-4g / m 2 , after the last sintering, the total weight increase by spraying on the titanium mesh substrate is 35-40g / m 2 .

[0100] Product test indicators:

[0101] 1. Test result of chlorine evolution potential: 1.09V-1.10V (indicator: current d...

Example Embodiment

[0105] Example 2:

[0106] Titanium mesh substrate: mesh pitch 3.5*6mm, thickness 1mm;

[0107] 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 composition of the formula material,

[0108] The final mass ratio of each raw material used is calculated as follows:

[0109] Ruthenium trichloride: iridium tetrachloride: chloroplatinic acid: titanium tetrachloride: zirconium chloride=76.0:26.1:12.6:154.8:7.7.

[0110] Making anode coating: 10 cycles of spraying, drying and sintering, each spraying amount is 45-50ml / m 2 , weighed after each sintering, the weight increased by 2.8-3.5g / m 2 , after the last sintering, the total weight increase by spraying on the titanium mesh substrate is 28-35g / m 2 .

[0111] Product test indicators:

[0112] 1. Test result of chlorine evolution ...

Example Embodiment

[0115] Example 3:

[0116] Titanium mesh substrate: mesh pitch 4.5*8mm mm, thickness 1mm;

[0117] Coating solution for anode coating: solid ruthenium trichloride, chloroiridic acid, chloroplatinic acid, titanium tetrachloride, palladium chloride and n-butanol, according to the atomic percentage of Ru40:Ir12:Pt9:Ti35:Pd4 material;

[0118]The final mass ratio of each raw material used is calculated as follows:

[0119] Ruthenium trichloride: iridium tetrachloride: chloroplatinic acid: titanium tetrachloride: palladium chloride=82.1:20.9:18.9:138.9:26.3.

[0120] Production of anode coating: 10 cycles of spraying, drying and sintering, each spraying amount is 40-45ml / m 2 , weighed after each sintering, the weight increased by 3-3.5g / m 2 , after the last sintering, the total weight increase by spraying on the titanium mesh substrate is 30-35g / m 2 .

[0121] Product test indicators:

[0122] 1. Test result of chlorine evolution potential: 1.10V-1.12V (indicator: current de...

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Abstract

The invention relates to a positive pole coating for an ion membrane electrolysis bath. The positive pole coating is characterized by comprising, in weight percent, 35-45mol% of ruthenium, 5-15mol% ofiridium, 5-10mol% of platinum, 35-45mol% of titanium and smaller than 4%mol% of other additives. The additives comprise zirconium chloride or palladium chloride. The positive pole coating for the ionmembrane electrolysis bath is used for an active anode, an oxygen evolution potential is high, catalytic ability is high, conductivity is high, oxygen evolution side reaction cannot be easily generated, the coat is stable in performance, resistant to corrosion, long in service life, coating can continue to be used after recoating after an electrode is faulted, electrodes is effectively controlled, product quality is improved, and required chlorine purity is high, and oxygen content is low.

Description

technical field [0001] The invention relates to an anode coating for an ion membrane electrolyzer. In particular, it relates to a noble metal oxide coating that can be suitable for the titanium-based anode of the ionized membrane electrolyzer used in the chlor-alkali industry to electrolyze brine. Background technique [0002] The chlor-alkali industry is a basic chemical industry. At present, the ion-exchange membrane method is used to produce alkali, that is, the salt water is electrolyzed through the ion-exchange membrane electrolyzer to produce caustic soda, chlorine, hydrogen, etc. [0003] Anode reaction 2Cl － -2e － = Cl 2 ↑ [0004] 4OH － -4e － =O 2 ↑+2H 2 o [0005] Cathodic reaction 2H 2 O+2e － =H 2 ↑+2OH － [0006] Reaction of dissolved chlorine gas with sodium hydroxide from cathode reverse osmosis [0007] 3Cl 2 +6NaOH=5NaCl+NaClO 3 +3H 2 o [0008] Generated NaClO 3 Has strong oxidizing properties. [0009] In the production of chlor-alkali,...

Claims

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Application Information

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IPC IPC(8): C25B11/06C25B11/10C25B1/46B01J23/46
CPCB01J23/468B01J35/0033C25B1/46C25B11/093
Inventor 徐国民刘金梅
Owner 宏泽(江苏)科技股份有限公司
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