Patent US5158658A successfully refreshed from Google Patents.
US5158658A
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US
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Electrochemical chlorine dioxide generator
Assignee: Olin Corp
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Filing: 1990-10-31
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Granted: 1992-10-27
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Expires: 2010-10-31
Abstract
Abstract An electrochemical process and electrolytic cell for manufacturing chlorine-free chlorine dioxide from dilute alkali metal chlorite solutions in a single step is disclosed. The electrolytic cell uses a porous flow-through anode and a cathode separated by a suitable separator.
Inventors
- 👤 David W. Cawlfield
- 👤 Jerry J. Kaczur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:41
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B1/24; C25B1/26; C25B9/00; C25B9/17; C25B9/19
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
130 words
An electrolytic cell for the continuous production of a solution of chlorine dioxide by the electrolysis of an aqueous alkali metal chlorite comprising in combination: (a) a cell frame including an anode frame and a cathode frame; (b) a porous high surface area anode within the anode frame, the anode being compressible and flexible and being positioned flush with the anode frame on a side nearer the cathode frame, the anode having a surface area to anolyte volume ratio of greater than about 50 cm 2 /cm 3 ; (c) a cathode within the cathode frame; (d) a separator between the anode and the cathode; and (e) a first spacer material between the separator and the anode such that upon assembly the anode is kept flush with the anode frame.
Claim 2
Dependent Claim
130 words
An electrolytic cell for the continuous production of a solution of chlorine dioxide by the electrolysis of an aqueous alkali metal chlorite comprising in combination: (a) a cell frame including an anode frame and a cathode frame; (b) a porous high surface area anode within the anode frame, the anode being compressible and flexible and being positioned flush with the anode frame on a side nearer the cathode frame, the anode having a surface area to anolyte volume ratio of greater than about 50 cm 2 /cm 3 ; (c) a cathode within the cathode frame; (d) a separator between the anode and the cathode; and (e) a first spacer material between the separator and the anode such that upon assembly the anode is kept flush with the anode frame.
Claim 3
Dependent Claim
44 words
The apparatus according to claim 1 wherein the cell further comprises anolyte infeed means connected to the anode frame to feed aqueous alkali metal chlorite into an anolyte compartment in the frame so that the anolyte passes one time through the anode during electrolysis.
Claim 4
Dependent Claim
23 words
The apparatus according to claim 2 wherein the anolyte compartment further comprises an anode current distributor between the anode frame and the anode.
Claim 5
Dependent Claim
44 words
The apparatus according to claim 3 wherein the separator has a superficial surface area or projected area such that the ratio of the surface area of the anode to the superficial surface area or projected area of the separator is about 50 or greater.
Claim 6
Dependent Claim
17 words
The apparatus according to claim 4 wherein the separator is further a cation permselective ion exchange membrane.
Claim 7
Dependent Claim
29 words
The apparatus according to claim 3 wherein the anode current distributor further comprises a material selected from the group consisting of graphite, gold, platinum, tantalum, niobium, titanium or zirconium.
Claim 8
Dependent Claim
18 words
The apparatus according to claim 6 wherein the anode current distributor is further oxide or metallic film coated.
Claim 9
Dependent Claim
28 words
The apparatus according to claim 7 wherein the oxide or metallic film coating is one selected from the group consisting of platinum, gold, palladium, ferrite, magnesium or manganese.
Claim 10
Dependent Claim
39 words
The apparatus according to claim 2 wherein the anode further comprises a material selected from the group consisting of graphite, graphite felt, carbon, or metallic materials such as platinum, gold, palladium, iridium, rhodium, ruthenium or alloys or coatings thereof.
Claim 11
Dependent Claim
28 words
The apparatus according to claim 2 wherein the anode further comprises a high surface area substrate selected from the group consisting of ceramic, titanium fiber or plastic fiber.
Claim 12
Dependent Claim
26 words
The apparatus according to claim 10 wherein the anode high surface area substrate further includes a coating selected from the group consisting of gold or platinum.
Claim 13
Dependent Claim
28 words
The apparatus according to claim 2 wherein the cathode is further comprised of material selected from the group consisting of stainless steel, nickel, nickel-chrome, titanium or alloys thereof.
Claim 14
Dependent Claim
25 words
The apparatus according to claim 2 wherein the cathode is contained within a catholyte chamber into which is fed aqueous catholyte via catholyte infeed means.
Claim 15
Dependent Claim
22 words
The apparatus according to claim 13 wherein the catholyte chamber further includes a second spacer material between the membrane and the cathode.
Claim 16
Dependent Claim
15 words
The apparatus according to claim 14 wherein the second spacer material further comprises non-conductive material.
Claim 17
Dependent Claim
18 words
The apparatus according to claim 15 wherein the second spacer material is perforated to facilitate hydrogen gas disengagement.
Claim 18
Dependent Claim
13 words
The apparatus according to claim 16 wherein the second spacer material is plastic.
Claim 19
Dependent Claim
13 words
The apparatus according to claim 15 wherein the second spacer material is plastic.
Claim 20
Dependent Claim
13 words
The apparatus according to claim 14 wherein the second spacer material is conductive.
Claim 21
Dependent Claim
14 words
The apparatus according to claim 19 wherein the second spacer material is graphite felt.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-27 | 1996-04-27 | 1996-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-27 | 2000-04-27 | 2000-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-27 | 2004-04-27 | 2004-10-27 | $7700.00 | Window Closed / Lapsed |