US4529577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxygen/nitrogen production with molten alkali salts
Assignee: Air Products and Chemicals Inc
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Filing: 1984-07-11
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Granted: 1985-07-16
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Expires: 2004-07-11
Abstract
Abstract Method of separating oxygen or nitrogen from air using as an oxygen acceptor composition a molten solution of alkali metal salt of a cation composition of sodium and potassium cations and an anion composition of 50 to 94% nitrate, 4 to 25% nitrite and combined oxide, peroxide and superoxide wherein said oxides are present in less than 1 mol % based on sodium peroxide.
Inventors
- 👤 Michael S. Chen
- 👤 Michael T. Heffelfinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:38
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/14; B01D53/02; C; C01; C01B; C01B13/00; C01B13/02; C01B13/0292; C01B21/00; C01B21/04; C01B21/0405; C01B21/0411; C01B2210/00; C01B2210/0043; C01B2210/0045
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
99 words
In a continuous process for recovering oxygen or nitrogen from air comprising reacting an oxygen acceptor with air in an absorption reaction to produce a nitrogen-rich effluent, separately decomposing the oxidized acceptor to yield oxygen and regenerated oxygen acceptor and recycling the oxygen acceptor, said oxygen acceptor comprising a molten solution of alkali metal salt of a cation composition of sodium and potassium cations and an anion composition of 50 to 94% nitrate, 4 to 25% nitrite and combined peroxide, oxide and superoxide, the improvement wherein said oxides are present in less than 1 mol% based on sodium peroxide.
Claim 2
Dependent Claim
99 words
In a continuous process for recovering oxygen or nitrogen from air comprising reacting an oxygen acceptor with air in an absorption reaction to produce a nitrogen-rich effluent, separately decomposing the oxidized acceptor to yield oxygen and regenerated oxygen acceptor and recycling the oxygen acceptor, said oxygen acceptor comprising a molten solution of alkali metal salt of a cation composition of sodium and potassium cations and an anion composition of 50 to 94% nitrate, 4 to 25% nitrite and combined peroxide, oxide and superoxide, the improvement wherein said oxides are present in less than 1 mol% based on sodium peroxide.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the reaction temperature is in the range of 850° to 1250° F.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein the oxides are added to the molten solution.
Claim 5
Dependent Claim
24 words
The process of claim 1 wherein the oxides are formed in-situ in the molten solution by first pretreating the molten solution at high temperature.
Claim 6
Dependent Claim
13 words
The process of claim 1 wherein the reaction temperature is approximately 1200° F.
Claim 7
Dependent Claim
13 words
The process of claim 1 wherein the oxide concentration is approximately 0.1 mol%.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |