Global Patent Index - EP 0979318 A1

EP 0979318 A1 2000-02-16 - ELECTROLYSIS OF ALKALI METAL HALIDE BRINES USING OXYGEN CATHODE SYSTEMS

Title (en)

ELECTROLYSIS OF ALKALI METAL HALIDE BRINES USING OXYGEN CATHODE SYSTEMS

Title (de)

ELEKTROLYSE VON ALKALIMETALL HALOGENIDEN MIT SAUERSTOFF-DIFFUSIONS KATHODEN

Title (fr)

ELECTROLYSE DE SAUMURES D'HALOGENURES DE METAUX ALCALINS EFFECTUEE AU MOYEN DE SYSTEMES CATHODIQUES COMPRENANT DE L'OXYGENE

Publication

EP 0979318 A1 (EN)

Application

EP 98914515 A

Priority

  • US 9806769 W
  • US 4275297 P

Abstract (en)

[origin: WO9845503A1] A process for the electrolysis of an alkali metal halide brine in an electrolytic cell having an anode compartment having at least one anode, a cathode compartment having at least one cathode, and a membrane in contact with the cathode (thereby forming a membrane electrode assembly) which separates the anode compartment from the cathode compartment. The method comprises (a) feeding the alkali metal halide brine to the anode compartment; (b) electrolyzing the alkali halide brine to produce a halogen gas and alkali metal ions; (c) passing the alkali metal ions and water through the membrane into the cathode compartment; and (d) feeding an oxygen-containing gas to the cathode compartment so that the oxygen is reduced at the cathode and a concentrated alkali metal hydroxide solution is produced. The process is further characterized by having a flow field located adjacent to the cathode to facilitate transporting the oxygen gas to the cathode and alkali metal hydroxide away from the cathode and in that the flow field comprises an electronically conductive material having a porosity of at least 30 percent and a mean pore size of at least 10 microns.

IPC 1-7 (main, further and additional classification)

C25B 1/46

IPC 8 full level (invention and additional information)

C25B 1/46 (2006.01)

CPC (invention and additional information)

C25B 1/46 (2013.01)

Citation (search report)

See references of WO 9845503A1

Designated contracting state (EPC)

DE FR GB IT NL

EPO simple patent family

WO 9845503 A1 19981015; AU 6885498 A 19981030; AU 727997 B2 20010104; CA 2286175 A1 19981015; CN 1257555 A 20000621; EP 0979318 A1 20000216; ID 24252 A 20000713; KR 20010006129 A 20010126; TW 460625 B 20011021

INPADOC legal status


2002-10-23 [18R] REFUSED

- Ref Legal Event Code: 18R

- Effective date: 20020524

2002-01-09 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 20011127

2000-02-16 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 19991108

2000-02-16 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): DE FR GB IT NL