Electrode for electrolysis, electrolyzer, electrode laminate and method for renewing electrode

a technology of electrolysis and electrodes, applied in the direction of electrodes with substrates and coatings, electrolysis processes, electrolysis components, etc., can solve the problems of sometimes increasing voltage, and achieve the effect of reducing voltage and power consumption and having practical strength

Pending Publication Date: 2019-11-28
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an electrode for electrolysis that can successfully reduce voltage and power consumption while maintaining practical strength.

Problems solved by technology

If electrolysis is continued for a long term, voltage may sometimes increase due to causes such as impurities contained in brine.

Method used

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  • Electrode for electrolysis, electrolyzer, electrode laminate and method for renewing electrode
  • Electrode for electrolysis, electrolyzer, electrode laminate and method for renewing electrode
  • Electrode for electrolysis, electrolyzer, electrode laminate and method for renewing electrode

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0151]As a conductive substrate, an expanded metal made of titanium and having a center-to-center distance (SW) in the minor-axis direction of a mesh of 2.1 mm, a center-to-center distance (LW) in the major-axis direction of the mesh of 3 mm and a plate-thickness of 0.81 mm, was used. The plate-thickness was measured by a thickness gauge. The values of SW, LW, St, opening ratio and the sum of perimeters of openings were determined by observing a specified range of the surface of the conductive substrate by an image observation apparatus such as e.g., a microscope, photographing a projection plane and analyzing image data. As a method for analyzing image data, for example, “Image J” developed by the US National Institutes Of Health (NIH) and open to public, was used for processing images. The size of the image of the conductive substrate subjected to image processing falls within the range of 8.0×5.3 mm. More specifically, an openings present within the range were used as targets. Th...

example 2

[0158]An electrode for electrolysis was produced in the same manner as in Example 1 except that the conductive substrate of Example 1 was changed to an expanded metal made of titanium and having a thickness of 0.8 mm, in which the center-to-center distance (SW) in the minor-axis direction of a mesh was 2.2 mm and the center-to-center distance (LW) in the major-axis direction of the mesh was 4.2 mm.

[0159]The resultant electrode for electrolysis had a thickness of 0.80 mm and an opening ratio of 10.9%. The number of openings in the projected area of the electrode was 20 openings / cm2 and a value, which is obtained by dividing the sum of perimeters of openings by the opening ratio, was 3.26. The shape of the openings observed was the same as in FIG. 4 (A). The opening 100 was right-and-left symmetric about the first imaginary center line 101 extending in minor-axis direction α of a mesh. The opening 100 was up-and-down asymmetric about the second imaginary center line extending 102 exte...

example 3

[0160]An electrode for electrolysis was produced in the same manner as in Example 1 except that the conductive substrate of Example 1 was changed to an expanded metal made of titanium and having a thickness of 0.83 mm, in which the center-to-center distance (SW) in the minor-axis direction of a mesh was 2.3 mm and the center-to-center distance (LW) in the major-axis direction of the mesh was 3.3 mm.

[0161]The resultant electrode for electrolysis had a thickness of 0.83 mm and an opening ratio of 9.25%. The number of openings in the projected area of the electrode was more than 20 openings / cm2 and a value, which is obtained by dividing the sum of perimeters of openings by the opening ratio, was 3.65. The shape of the openings observed was the same as in FIG. 4 (A). The opening 100 was right-and-left symmetric about the first imaginary center line 101 extending in minor-axis direction α of a mesh. The opening 100 was up-and-down asymmetric about the second imaginary center line 102 ext...

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Abstract

An electrode for electrolysis includinga conductive substrate formed of a porous metal plate, andat least one catalyst layer formed on a surface of the conductive substrate, whereinthe electrode for electrolysis has a thickness of more than 0.5 mm and 1.2 mm or less; andvalue C, which is obtained by dividing sum B of perimeters of openings of the electrode for electrolysis by opening ratio A of the electrode for electrolysis, is more than 2 and 5 or less.

Description

TECHNICAL FIELD[0001]The present invention relates to an electrode for electrolysis, an electrolyzer, an electrode laminate and a method for renewing an electrode.BACKGROUND ART[0002]Sodium chloride electrolysis by ion exchange membrane process is a method for electrically decomposing (electrolyzing) brine by use of an electrode for electrolysis to produce caustic soda, chlorine and hydrogen. In sodium chloride electrolysis by ion exchange membrane process, a technology for maintaining low electrolysis voltage for a long term is required in order to reduce power consumption, in view of environmental load and energy problem.[0003]To more specifically analyze the breakdown of the electrolysis voltage, it has been found that not only a theoretical requisite electrolysis voltage but also voltages due to resistance of an ion exchange membrane and structure resistance of an electrolyzer, overvoltages of an anode and a cathode serving as electrodes for electrolysis, and voltage due to the ...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): C25B11/03C25B11/04C25B9/19C25B9/23
CPCC25B11/035C25B11/0405C25B1/46C25B11/03C25B9/19C25B11/051C25B11/031
InventorNISHIZAWA, MAKOTOKADO, YOSHIFUMIHACHIYA, TOSHINORI
OwnerASAHI KASEI KK