Patent US4859296A successfully refreshed from Google Patents.
US4859296A
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Electrochemical separation of oxygen
Assignee: Gas Technology Institute
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Filing: 1988-02-25
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Granted: 1989-08-22
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Expires: 2008-02-25
Abstract
Abstract An electrochemical separation of oxygen from oxygen containing gaseous mixtures, such as air, using an oxygen containing molten inorganic salt electrolyte retained in a porous matrix between two gas porous catalytic electrodes wherein oxygen is separated from the gaseous mixture when electrical potential is applied across the electrodes providing movement of non-metallic oxygen containing ion from the cathode to the anode.
Inventors
- 👤 Leonard G. Marianowski
- 👤 Robert J. Remick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:24
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B1/02
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
158 words
A process for electrochemical separation of oxygen from an oxygen containing gaseous mixture comprising: supplying a gaseous admixture comprising O 2 and a non-metallic oxide to a porous cathode catalytically active for promotion of a cathode reaction ze - +nO 2 +XO m →XO zn z- +m, passing formed oxygen containing non-metallic ion through an oxygen containing molten inorganic salt electrolyte to a porous anode catalytically active for promotion of an anode reaction XO zn +m z- →ze - +nO 2 +XO m wherein z=1, 2, or 3; n=1/2 or 1; m=1, 2, or 3; and X=a non-metallic oxide forming element capable of forming the oxide and oxygen containing ion for conduct of said electrochemical reactions, separating formed O 2 from formed said non-metallic oxide and removing separated O 2 from the process, passing released e - through an external electrical circuit to said cathode, and supplying electric potential to said cathode sufficient to drive said electrochemical reactions.
Claim 2
Dependent Claim
158 words
A process for electrochemical separation of oxygen from an oxygen containing gaseous mixture comprising: supplying a gaseous admixture comprising O 2 and a non-metallic oxide to a porous cathode catalytically active for promotion of a cathode reaction ze - +nO 2 +XO m →XO zn z- +m, passing formed oxygen containing non-metallic ion through an oxygen containing molten inorganic salt electrolyte to a porous anode catalytically active for promotion of an anode reaction XO zn +m z- →ze - +nO 2 +XO m wherein z=1, 2, or 3; n=1/2 or 1; m=1, 2, or 3; and X=a non-metallic oxide forming element capable of forming the oxide and oxygen containing ion for conduct of said electrochemical reactions, separating formed O 2 from formed said non-metallic oxide and removing separated O 2 from the process, passing released e - through an external electrical circuit to said cathode, and supplying electric potential to said cathode sufficient to drive said electrochemical reactions.
Claim 3
Dependent Claim
31 words
A process according to claim 1 wherein said non-metallic oxide is selected from the group consisting of NO 2 , CO 2 , SO 2 and P 2 O 5 .
Claim 4
Dependent Claim
34 words
A process according to claim 2 wherein said oxygen containing inorganic salt electrolyte has an oxygen containing portion selected from the group consisting of nitrate, carbonate, sulfate and phosphate corresponding to said non-metallic oxide.
Claim 5
Dependent Claim
32 words
A process according to claim 3 wherein said electrolyte is retained in a porous matrix selected from the group consisting of MgO, Al 2 O 3 , LiAlO 2 and mixtures thereof.
Claim 6
Dependent Claim
14 words
A process according to claim 1 wherein said oxygen containing gaseous mixture comprises air.
Claim 7
Dependent Claim
46 words
A process according to claim 1 wherein said anode and cathode comprises a catalyst selected from elements of the Periodic Table appearing in a group selected from the group consisting of Groups IB, IIB, IIIA, VB, VIB, VIIB and VIII in metal, oxide or cermet form.
Claim 8
Dependent Claim
26 words
A process according to claim 6 wherein said catalyst is selected from the group consisting of zinc, silver, nickel, aluminum, iron, copper, chromium, and mixtures thereof.
Claim 9
Dependent Claim
16 words
A process according to claim 1 wherein one of said anode and cathode comprises copper oxide.
Claim 10
Dependent Claim
22 words
A process according to claim 1 wherein said process is carried out at a temperature of about 500° to about 900° C.
Claim 11
Dependent Claim
21 words
A process according to claim 1 wherein said process is carried out at a temperature of about 500° to about 700°.
Claim 12
Dependent Claim
21 words
A process according to claim 1 wherein said process is carried out at a pressure about 1 to about 100 atmospheres.
Claim 13
Dependent Claim
21 words
A process according to claim 1 wherein said process is carried out at a pressure about 1 to about 5 atmospheres.
Claim 14
Dependent Claim
22 words
A process according to claim 1 wherein said gaseous admixture comprises about 1 to about 30 mole percent said non-metallic oxide concentration.
Claim 15
Dependent Claim
22 words
A process according to claim 1 wherein said gaseous admixture comprises about 15 to about 20 mole percent said non-metallic oxide concentration.
Claim 16
Dependent Claim
35 words
A process according to claim 1 comprising the additional step of withdrawing exhaust gas from said cathode, separating and discharging oxide forming element from said exhaust gas, and recycling principally oxide to said gaseous admixture.
Claim 17
Dependent Claim
97 words
A process according to claim 1 wherein said non-metallic oxide is selected from the group consisting of NO 2 , CO 2 , SO 2 and P 2 O 5 , said oxygen containing inorganic salt electrolyte has an oxygen containing portion selected from the group consisting of nitrate, carbonate, sulfate and phosphate corresponding to said non-metallic oxide, one of said anode and cathode comprises copper oxide, said process is carried out at a pressure about 1 to about 100 atmospheres, and said gaseous admixture comprises about 15 to about 20 mole percent said non-metallic oxide concentration.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |