Patent US4244793A successfully refreshed from Google Patents.
US4244793A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brine electrolysis using fixed bed oxygen depolarized cathode chlor-alkali cell
Assignee: PPG Industries Inc
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Filing: 1979-10-09
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Granted: 1981-01-13
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Expires: 1999-10-09
Abstract
Abstract Disclosed is a method of electrolyzing alkali metal chloride brine between an anode and a cathode, with oxidant feed to the cathode, where the cathode is a bed of porous particles having HO231 disproportionation catalyst. Also disclosed is an electrolytic cell for carrying out the disclosed process.
Inventors
- 👤 Harlan B. Johnson
- 👤 Ronald D. Chamberlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:07
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B1/34; C25B1/46; C25B11/00; C25B11/02; C25B11/037; C25B11/04; C25B11/051; C25B9/00; C25B9/40; C25B9/47
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
98 words
In a method of electrolyzing an aqueous alkali metal chloride brine in an electrolytic cell having an anolyte compartment with an anode therein, a catholyte compartment with cathode means therein, and an ion permeable barrier therebetween, which method comprises feeding said brine to the anolyte compartment, feeding an oxidant to aid catholyte compartment, passing an electrical current from said anode to said cathode means, recovering chlorine from said anolyte compartment, and recovering aqueous alkali metal hydroxide as a catholyte product, the improvement wherein said cathode means comprises closely packed porous particles having HO 2 - disproportionation catalyst areas.
Claim 2
Dependent Claim
98 words
In a method of electrolyzing an aqueous alkali metal chloride brine in an electrolytic cell having an anolyte compartment with an anode therein, a catholyte compartment with cathode means therein, and an ion permeable barrier therebetween, which method comprises feeding said brine to the anolyte compartment, feeding an oxidant to aid catholyte compartment, passing an electrical current from said anode to said cathode means, recovering chlorine from said anolyte compartment, and recovering aqueous alkali metal hydroxide as a catholyte product, the improvement wherein said cathode means comprises closely packed porous particles having HO 2 - disproportionation catalyst areas.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein said porous particles comprise a porous electroconductive substrate having an HO 2 - disproportionation catalyst on the surface thereof.
Claim 4
Dependent Claim
19 words
The method of claim 2 wherein said HO 2 - disproportionation catalyst is a different material than the substrate.
Claim 5
Dependent Claim
10 words
The method of claim 3 wherein said substrate is carbonaceous.
Claim 6
Dependent Claim
27 words
The method of claim 4 wherein said carbonaceous substrate is activated carbon having a surface area of from about 100 to about 500 square meters per gram.
Claim 7
Dependent Claim
53 words
The method of claim 2 wherein said HO 2 - disproportionation catalyst is chosen from the group consisting of Cr, Mo, W, Mn, Tc, Re, Fe, Co, Ni, Ru, Rh, Pt, Os, Ir, Pt, Cu, Ag, Au, Zn, Cd, Al, In, Sn, Pb, As, Sb, Bi, Se, Te mixtures thereof, and compounds thereof.
Claim 8
Dependent Claim
35 words
The method of claim 6 wherein said HO 2 disproportionation catalyst is chosen from the group consisting of Cu, Ag, Au, Al, In, Sn, Pb, As, Sb, Bi, Se, Te, mixtures thereof, and compounds thereof.
Claim 9
Dependent Claim
15 words
The method of claim 2 wherein said HO 2 - disproportionation catalyst is a perovskite.
Claim 10
Dependent Claim
45 words
The method of claim 8 wherein the perovskite is chosen from the group consisting of alkali metal molybdates, alkali metal tungstates, alkaline earth metal ruthenates, alkaline earth metal ruthenites, alkaline earth metal rhodates, alkaline earth metal osmates, alkaline earth metal osmites, and alkaline earth cobaltates.
Claim 11
Dependent Claim
12 words
The method of claim 9 wherein the perovskite is LaCoO 3 .
Claim 12
Dependent Claim
12 words
The method of claim 2 wherein said particles comprise a hydrophobic material.
Claim 13
Dependent Claim
12 words
The method of claim 11 wherein said hydrophobic material is a polyfluorocarbon.
Claim 14
Dependent Claim
14 words
The method of claim 1 wherein said ion permeable barrier is a permionic membrane.
Claim 15
Dependent Claim
15 words
The method of claim 1 wherein said ion permeable barrier is an electrolyte permeable diaphragm.
Claim 16
Dependent Claim
21 words
The method of claim 1 wherein said ion permeable barrier is substantially vertically disposed between said anode and said cathode means.
Claim 17
Dependent Claim
10 words
The method of claim 1 wherein said oxidant is oxygen.
Claim 18
Dependent Claim
15 words
The method of claim 16 comprising feeding air to the catholyte compartment of said cell.
Claim 19
Dependent Claim
16 words
The method of claim 16 comprising feeding excess oxygen to the catholyte compartment of said cell.
Claim 20
Dependent Claim
39 words
The method of claim 1 wherein said cathode means comprises a current collector contacting said porous particles, and fabricated of an electroconductive material resistant to aqueous alkali metal hydroxides, and having a higher hydrogen evolution overvoltage than said particles.
Claim 21
Dependent Claim
14 words
The method of claim 1 wherein said particles are closely packed and substantially immobile.
References Cited (Backward Citations)
US3527617A
Cited
US3457152A
Cited
US3654098A
Cited
US3616356A
Cited
US3716459A
Cited
US3761383A
Cited
US3755114A
Cited
US4035255A
Cited
US4035254A
Cited
US3981787A
Cited
US3945892A
Cited
US3974049A
Cited
US3941669A
Cited
US3966571A
Cited
US3919062A
Cited
US3915822A
Cited
US4111292A
Cited
US4124453A
Cited
US4146438A
Cited
US4147839A
Cited
US4073707A
Cited
BE868520A
Cited
US4177116A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |