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US4287162A
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Separation of ammonia from ammonia containing gases
Assignee: Sunoco Inc R&M
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Filing: 1979-07-18
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Granted: 1981-09-01
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Expires: 1999-07-18
Abstract
Abstract A process for the separation and recovery of substantially pure ammonia from its admixture with gases, particularly with gases containing carbon dioxide and gases obtained from the catalytic ammoxidation of hydrocarbons to the corresponding nitriles, by scrubbing the ammonia containing gases with an aqueous solution containing a mixture of salts having different cations and the anions of one or more inorganic acids capable of absorbing and liberating ammonia; e.g., mixtures of different alkali metal salts of phosphoric, telluric, boric, vanadic, chromic, selenic, germanic, silicic and similar acids. Preferably the anion component will be at least one of phosphoric, chromic, or boric acids.
Inventors
- 👤 Edward G. Scheibel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:33
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/02; C01C1/12; B; B01; B01D; B01D53/00; B01D53/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
76 words
A process for the recovery of ammonia from its admixture with gases which comprises scrubbing said ammonia containing gas at a temperature between about 50° to about 115° C. with an aqueous solution containing a mixture of different cations selected from the group consisting of ammonia and alkali metal cations and a mixture of anions of phosphate and borate, wherein said anions are at a concentration of from about 80% to about 90% of saturation concentration.
Claim 2
Dependent Claim
76 words
A process for the recovery of ammonia from its admixture with gases which comprises scrubbing said ammonia containing gas at a temperature between about 50° to about 115° C. with an aqueous solution containing a mixture of different cations selected from the group consisting of ammonia and alkali metal cations and a mixture of anions of phosphate and borate, wherein said anions are at a concentration of from about 80% to about 90% of saturation concentration.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the ammonia-containing gas contains carbon dioxide.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein the ammonia-containing gas is obtained from a catalytic ammoxidation process.
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) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |