Aqueous solution electrolysis method

Patent metadata

Field	Value
Publication number	US-2025051931-A1
Application number	US-202218722246-A
Country	US
Kind code	A1
Filing date	Sep 29, 2022
Priority date	Dec 24, 2021
Publication date	Feb 13, 2025
Grant date	—

Abstract

There is provided an aqueous solution electrolysis method that makes it possible to reduce the amount of bubbles covering an electrode and generate gases such as hydrogen and oxygen with excellent energy efficiency. The method is an electrolysis method for electrolyzing an aqueous-solution-based electrolyte to generate at least any one of hydrogen, oxygen, and chlorine, wherein the electrolyte contains a water-soluble alcohol. For example, as the electrolyte, an alkali aqueous solution containing about 0.1 to about 10% by volume of a water-soluble alcohol including a tertiary alcohol, such as 2-methylpropan-2-ol and 2-methylbutan-2-ol, and about 1 to 10 mol/L of an alkali component may be subjected to water electrolysis, and the electrolyte is electrolyzed using, for example, an electrolytic cell having an anode chamber and a cathode chamber.

First claim

1 . An aqueous solution electrolysis method comprising electrolyzing an aqueous-solution-based electrolyte to generate at least any one of hydrogen, oxygen, and chlorine, wherein
the electrolyte comprises a water-soluble alcohol.

2 . The aqueous solution electrolysis method according to claim 1 , wherein the alcohol is a tertiary alcohol.

3 . The aqueous solution electrolysis method according to claim 2 , wherein the tertiary alcohol is at least any one of 2-methylpropane-2-ol and 2-methylbutane-2-ol.

4 . The aqueous solution electrolysis method according to claim 1 , wherein
the electrolyte is an alkali aqueous solution comprising an alkali component, and the concentration of the alkali component in the alkali aqueous solution is 1 to 10 mol/L.

5 . The aqueous solution electrolysis method according to claim 1 , wherein
the concentration of the alcohol in the electrolyte is such that a surface tension of the electrolyte becomes 90% or less of a surface tension of a control electrolyte not containing the alcohol.

6 . The aqueous solution electrolysis method according to claim 1 , wherein the concentration of the alcohol in the electrolyte is 0.1 to 10% by volume.

7 . The aqueous solution electrolysis method according to claim 1 , wherein
an electrolytic cell having an anode chamber and a cathode chamber is used, and the electrolyte that is common to the anode chamber and the cathode chamber is supplied to the anode chamber and the cathode chamber respectively to electrolyze the electrolyte.

Assignees

• Nat Univ Corp Yokohama Nat Univ
• De Nora Permelec Ltd

Inventors

• Misumi Ryuta
• Mitsushima Shigenori
• IKEDA Hayata
• Nishiki Yoshinori
• Kato Akihiro
• Nakai Takaaki

Classifications

• C25B1/26

  Chlorine; Compounds thereof (by simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine C25B1/34) · CPC title

• C25B9/00

  Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features · CPC title

• C25B15/08

  Supplying or removing reactants or electrolytes; Regeneration of electrolytes · CPC title

• C25B1/46

  in diaphragm cells · CPC title

• Y02E60/36

  Hydrogen production from non-carbon containing sources, e.g. by water electrolysis · CPC title