# US 2013/0153433 A1 · Electrolytic cell for producing chlorine - sodium hydroxide and method of producing chlorine - sodium hydroxide

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- Number: US 2013/0153433 A1
- Document ID: US20130153433A1
- Status: Published application
- Kind: A1
- Application number: 13/807,790
- Filed: 2010-10-01
- Published: 2013-06-20
- Earliest claimed: 2010-07-13
- Assignees: Chlorine Engineers Corp., Ltd.; Kaneka Corporation; Toagosei Co., Ltd.
- Inventors: Tomonori Idutsu; Koji Saiki; Yukinori Iguchi; Kiyohito Asaumi
- Web page: https://patentgrep.com/patent/US20130153433A1

## CPC

- C25B 1/16: Hydroxides (by simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine C25B1/34)
- C25B 1/26: Chlorine; Compounds thereof (by simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine C25B1/34)
- C25B 1/34: Simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine, e.g. by chlor-alkali electrolysis
- C25B 1/46: in diaphragm cells
- C25B 9/19: with diaphragms
- C25B 13/04: characterised by the material
- C25B 13/05: based on inorganic materials
- C25B 13/07: based on ceramics
- C25B 13/08: based on organic materials
- C25B: ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR (anodic or cathodic protection C23F13/00; single-crystal growth C30B)

## Abstract

There is provided a method of production of chlorine.sodium hydroxide capable of being operated stably and economically by preventing calcium from being deposited in an ion exchange membrane. The liquid retention layer 3 having a liquid retention amount per unit volume of the liquid retention layer of 0.10 g-H2O/cm3 or more and 0.80 g-H2O/cm3 or less is put between the ion exchange membrane 12 and the gas diffusion electrode 16. Calcium ions transferred through the ion exchange membrane 12 easily diffuse, thereby making it possible to suppress increase in an electrolytic voltage and drop in current efficiency generated by deposition of the calcium ions inside the ion exchange membrane 12.

## Claims

### Claim 1

An electrolytic cell which is divide into an anode chamber and a cathode chamber by an ion exchange membrane, comprising an anode installed in said anode chamber, and a liquid retention layer and a gas diffusion electrode which are installed in said cathode chamber, wherein an electrolysis is conducted while supplying the brine into said anode chamber and an oxygen-containing gas into said cathode chamber, respectively; wherein said liquid retention layer having a liquid retention amount per unit volume of the liquid retention layer of 0.10 g-H2O/cm3 or more and 0.80 g-H2O/cm3 or less is put between said ion exchange membrane and said gas diffusion electrode.

### Claim 2 (depends on 1)

The electrolytic cell as claimed in claim 1, wherein said liquid retention amount is 0.15 g-H2O/cm3 or more and 0.61 g-H2O/cm3 or less.

### Claim 3 (depends on 1)

The electrolytic cell as claimed in claim 1, wherein said liquid retention layer is integrated with said ion exchange membrane or said gas diffusion electrode.

### Claim 4 (depends on 1)

The electrolytic cell as claimed in claim 1, wherein said liquid retention layer is made of a material having a chemical and physical resistance against sodium hydroxide.

### Claim 5 (depends on 1)

The electrolytic cell as claimed in claim 1, wherein the concentration of aqueous solution of hydroxide discharged from said cathode chamber is 25.0% by weight or more and 33.0% by weight or less.

### Claim 6 (depends on 1)

A method of production of sodium hydroxide making use of the electrolytic cell as claimed in claim 1.

### Claim 7 (depends on 1)

A method of production of chlorine making use of the electrolytic cell as claimed in claim 1.