| (19) |
 |
|
(11) |
EP 0 328 818 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
06.12.1989 Bulletin 1989/49 |
| (43) |
Date of publication A2: |
|
23.08.1989 Bulletin 1989/34 |
| (22) |
Date of filing: 01.12.1988 |
|
| (51) |
International Patent Classification (IPC)4: C25B 1/26 |
|
| (84) |
Designated Contracting States: |
|
AT DE ES FR GB IT SE |
| (30) |
Priority: |
16.02.1988 CA 558945
|
| (71) |
Applicant: Sterling Canada, Inc. |
|
Houston, Texas 77002-4312 (US) |
|
| (72) |
Inventors: |
|
- Lipsztajn, Marek
Rexdale
Ontario M9V 4K2 (CA)
- McGilvery, James Duncan
Etobicoke
Ontario M9C 1P7 (CA)
- Twardowski, Zbigniew
Mississauga
Ontario L4W 3W7 (CA)
|
| (74) |
Representative: W.P. THOMPSON & CO. |
|
Eastcheap House
Central Approach
Letchworth,
Hertfordshire SG6 3DS
Letchworth,
Hertfordshire SG6 3DS (GB) |
|
| |
|
| (54) |
Production of chlorine dioxide in an electrolytic cell |
(57) Chlorine dioxide is produced electrolytically in the cathode compartment of an electrolytic
cell using a three-dimensional high surface-area cathode. The cathode compartment
is separated from an anode compartment by a cation-exchange membrane. Sodium chlorate
is reacted with hydrogen ions and chloride ions in the cathode compartment and chlorine
dioxide is vented from the cathode compartments. Chlorine co-produced with the chlorine
dioxide is reduced at the cathode to provide chloride ions for the reaction while
electrolytically-produced hydrogen ions are transferred across the membrane from the
anode compartment to the cathode compartment to provide hydrogen ions for the reaction.