Unlock instant, AI-driven research and patent intelligence for your innovation.

Cathode member and bipolar plate for hypochlorite cells

A technology of hypochlorite and cathode components, which is applied in the field of electrochemical electrolytic cells produced by hypochlorite solution, and can solve problems such as separation and short operating life of titanium cathodes

Inactive Publication Date: 2011-08-24
IND DE NORA SPA
View PDF1 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ZrO 2 The operating life of coated titanium cathodes is often too short to justify the cost of implementing plasma spraying
In fact, although for corrosive environments, ZrO 2 Very stable build-up on the cathode surface, but cathodic hydrogen evolution tends to detach the protective layer from the titanium body in a short time

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]Use Al 2 o 3 Three zirconium plates (sample 1, 2 and 3) of 300 mm long, 150 mm wide and 5 mm thick were blasted until an average surface roughness (Ra) of 6 to 7 microns was obtained, coated with a layer of zirconia and applied to Accelerated test laboratory electrolyzers were characterized with hydrogen evolution cathodes where hypochlorite production was carried out under harsher process conditions than usual industrial practice.

[0028] Sample 1 was coated by applying an aqueous solution of zirconium diacetate (20% in acetic acid) with a zirconium concentration of 50 g / l, followed by thermal decomposition at 400° C. for 1 hour. Repeat this procedure for all four coats.

[0029] Use N 2 / H 2 The mixture was used as a carrier, and sample 2 was subjected to 8% Y in a single pass at 65V and 500A. 2 o 3 Modified ZrO 2 plasma spraying.

[0030] Sample 3 was fired in air at 500 °C for 1 h until thermally grown ZrO 2 layer.

[0031] The above samples were character...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A cathodic member for electrochemical cells used in hypochlorite production comprises a zirconium plate coated with a zirconium oxide layer, which is particularly suitable for minimising the decomposition of the hypochlorite product while ensuring a prolonged lifetime. The coated zirconium plate can be used as the cathodic plate in a monopolar cell, or can be welded to a titanium plate for use in a bipolar configuration.

Description

technical field [0001] The present invention relates to the field of electrochemical cells for electrolytic processes, in particular to electrochemical cells for the production of hypochlorite solutions. Background technique [0002] The electrolytic production of hypochlorite solutions from seawater or diluted brine is a well known electrochemical process. For example, electrochemically produced sodium hypochlorite or potassium hypochlorite produced in this way are used as bleaching agents. One of the most important applications of dilute hypochlorite solutions is in the field of water disinfection. Electrolysis processes are usually carried out in monopolar electrolysers or non-split bipolar electrolysers with interleaved planar electrodes. Sea water or dilute brine with a typical chlorine concentration of 15-40 g / l is circulated in the electrolytic cell at an appropriate current density to provide a hypochlorite solution at the anode with a typical concentration of 2 to...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/26C25B11/04C02F1/46
CPCC02F2001/46142C25B1/26C25B11/0415C02F1/4674C25B11/0478C02F2001/46128C25B11/057C25B11/091Y10T29/53204Y10T29/49204
Inventor C·W·布朗R·C·卡尔森K·L·哈迪
Owner IND DE NORA SPA