Method for the electrolytic preparation of hypochlorite in flowing salt-containing water

• US 4,786,380 A
• Filed: 04/09/1986
• Issued: 11/22/1988
• Est. Priority Date: 04/15/1985
• Status: Expired due to Fees

• Current Assignee: Nederlandse Centrale Organisatie Voor Toegepast - Natuurewetenschappelijk Onderzoek
• Original Assignee: Nederlandse Centrale Organisatie Voor Toegepast-Natuurewetenschappelij Onderzoek
• Inventors: van Duin, Pieter J., de Jong, Antonius M. C. P.
• Primary Examiner(s): TUNG, TA HSUNG
• Application Number:
  US06/849,775
• Time in Patent Office: 958 Days
• Field of Search: 204/95, 204/284, 204/292, 204/294, 204/149, 204/151, 204/152
• US Class Current: 210/748.2
• CPC Class Codes: C02F 1/46114 Electrodes in particulate form or with conductive and/or non conductive particles between them
• CPC Class Codes: C02F 1/4674 with halogen or compound of halogens, e.g. chlorine, bromine
• CPC Class Codes: C25B 1/26 Chlorine; Compounds thereof by simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine C25B1/34

Abstract

Method for the electrolytic preparation of hypochlorite in flowing salt-containing water for the purpose of disinfecting swimming baths, massage baths, drinking water etc. by means of an electrolysis reactor comprising a "scale-retarding" cathode having an open structure and a specific surface of at least 10 cm² /cm³.

Claims

1. Method for the electrolytic preparation of hypochlorite in flowing water containing from about 0.05M to 0.5M chloride ions, comprising converting the chloride ions to hypochlorite utilizing an electrolysis reactor, wherein the cathode of the electrolysis reaction has an open structure and a surface area of at least 100 cm² /cm³.

2. Method according to claim 1, wherein the cathode was a specific surface area of 100-600 cm² /cm³.

3. Method according to claim 1, wherein the cathode consists of a material constructed of fibres.

4. Method according to claim 3, wherein the cathode is constructed of graphite or carbon fibres.

5. Method according to claim 3, wherein the cathode consists of woven or felt material.

6. Method according to claim 3, wherein the cathode is constructed of metal fibres.

7. Method according to claim 1, wherein the cathode consists of a material, constructed of fibres having a thickness of 2-25 μ

m, which as a porosity of 0.7-0.98.

8. Method according to claim 7, wherein the cathode consists of a material constructed of fibres having a thickness of 5-15 μ

m.

9. Method according to claim 1, wherein the cathode is constructed of a sponge material or of a granular stack.

10. A method for disinfecting flowing water containing about 0.05M to about 0.5M chloride ions, comprising passing the water through an electrolysis reactor which converts the chloride ions to hypochlorite, wherein the cathode of the electrolysis reactor has an open structure and a specific surface area of at least 100 cm² /cm³.

11. A method according to claim 10, wherein the water contains about 0.05M NaCl.