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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 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

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

[0096] The coating liquid of anodic coating: ruthenium trichloride, iridium tetrachloride, chloroplatinic acid, titanium tetrachloride and hydrochloric acid aqueous solution, form formula raw material by the atomic percentage of Ru43:Ir9:Pt8:Ti40;

[0097] Calculate the mass ratio of each raw material used in the end as follows:

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

[0099] Making anodic coating: spraying, drying, and sintering for 10 cycles, and the amount of spraying in each pass is 55-60ml / m 2 , weighing after each sintering, the weight increases by 3.5-4g / m 2 , after the last sintering, the total weight of spraying on the titanium mesh substrate is 35-40g / m 2 .

[0100] Product test indicators:

[0101] 1. Test result of chlorine analysis potential: 1.09V-1.10V (indicator: current density 4KA / ㎡, saturated brine, tempera...

Embodiment 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 percent constitutes the formula material,

[0108] Calculate the mass ratio of each raw material used in the end 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 anodic coating: spraying, drying, and sintering for 10 cycles, and the amount of spraying in each pass is 45-50ml / m 2 , weighing after each sintering, the weight increases by 2.8-3.5g / m 2 , after the last sintering, the total weight of spraying on the titanium mesh substrate is 28-35g / m 2 .

[0111] Product test indicators:

[0112] 1. Test result of chlorine analysis potential: 1.10...

Embodiment 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 composition formula of Ru40:Ir12:Pt9:Ti35:Pd4 material;

[0118]Calculate the mass ratio of each raw material used in the end as follows:

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

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

[0121] Product test indicators:

[0122] 1. Test result of chlorine analysis potential: 1.10V-1.12V (indicator: c...

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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
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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