US4547293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for removal of ammonia and acid gases from contaminated waters
Assignee: United States Department of Energy
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Filing: 1984-08-30
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Granted: 1985-10-15
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Expires: 2004-08-30
Abstract
Abstract Contaminating basic gases, i.e., ammonia, and acid gases, e.g., carbon dioxide, are removed from process waters or waste waters in a combined extraction and stripping process. Ammonia in the form of ammonium ion is extracted by an immiscible organic phase comprising a liquid cation exchange component, especially an organic phosphoric acid derivative, and preferably di-2-ethyl hexyl phosphoric acid, dissolved in an alkyl hydrocarbon, aryl hydrocarbon, higher alcohol, oxygenated hydrocarbon, halogenated hydrocarbon, and mixtures thereof. Concurrently, the acidic gaseous contaminants are stripped from the process or waste waters by stripping with steam, air, nitrogen, or the like. The liquid cation exchange component has the ammonia stripped therefrom by heating, and the component may be recycled to extract additional amounts of ammonia.
Inventors
- 👤 C. Judson King
- 👤 Patricia D. MacKenzie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:49
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/58; C02F1/586; B; B01; B01D; B01D19/00; B01D19/0005; C02F1/20; C02F1/26; C02F2101/00; C02F2101/10; C02F2101/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
124 words
In a process for the removal of ammonia and weak acid gases from contaminated water wherein: (a) said contaminated water is contacted with an ion exchange agent to combine said ion exchange agent with said ammonia; and, (b) said acid gases are concurrently extripped from said contaminated water with a gaseous stripping media; (c) the improvement comprising the prevention of the formation of an emulsion of said ion exchange agent with said water by employing the water-insoluble organophosphoric acid as said ion exchange agent and with the further provision that said organophosphoric acid is dissolved in a water-immiscible organic solvent whereby said organophosphoric acid ion exchange agent with said water-immiscible organic solvent forms an organic phase and said contaminated water forms a water phase.
Claim 2
Dependent Claim
124 words
In a process for the removal of ammonia and weak acid gases from contaminated water wherein: (a) said contaminated water is contacted with an ion exchange agent to combine said ion exchange agent with said ammonia; and, (b) said acid gases are concurrently extripped from said contaminated water with a gaseous stripping media; (c) the improvement comprising the prevention of the formation of an emulsion of said ion exchange agent with said water by employing the water-insoluble organophosphoric acid as said ion exchange agent and with the further provision that said organophosphoric acid is dissolved in a water-immiscible organic solvent whereby said organophosphoric acid ion exchange agent with said water-immiscible organic solvent forms an organic phase and said contaminated water forms a water phase.
Claim 3
Dependent Claim
40 words
A process according to claim 1 wherein said process is further improved by separating and recovering said ammonia from said combination with said water-insoluble organophosphoric acid ion exchange agent and recycling said water-insoluble ion exchange agent freed of said ammonia.
Claim 4
Dependent Claim
73 words
A process according to claim 2 wherein said ammonia is separated and recovered from said water-insoluble organophosphoric acid ion exchange agent by: (d) separating said organic phase from said water phase; and, (e) thermally stripping the organic phase with a gaseous stripping media to remove the ammonia from the combination with said organophosphoric acid ion exchange agent whereby the latter dissolved in said organic solvent is obtained in a form suitable for recycling.
Claim 5
Dependent Claim
30 words
The process of claim 3 wherein said water-immiscible organic solvent is selected from the group consisting of alkyl hydrocarbons, aryl hydrocarbons, higher alcohols, oxygenated hydrocarbons, halogenated hydrocarbons, and mixtures thereof.
Claim 6
Dependent Claim
14 words
The process of claim 4 wherein said organophosphoric acid is di-2-ethyl hexyl phosphoric acid.
Claim 7
Dependent Claim
11 words
The process of claim 4 wherein said organic solvent is decanol.
Claim 8
Dependent Claim
25 words
The process of claim 4 wherein said water-insoluble organophosphoric acid ion exchange agent is di-2-ethyl hexyl phosphoric acid and said water-immiscible organic solvent is decanol.
Claim 9
Dependent Claim
21 words
The process of claim 7 wherein an alkyl hydrocarbon or aryl hydrocarbon is admixed as a portion of said organic solvent.
References Cited (Backward Citations)
US3620674A
Cited
US3649190A
Cited
US3649220A
Cited
US3779907A
Cited
US4360448A
Cited
US3676106A
Cited
US4029744A
Cited
US4064040A
Cited
US3969265A
Cited
US4235713A
Cited
US4287071A
Cited
US4334999A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-14 | 1989-04-15 | 1989-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-14 | 1993-04-15 | 1993-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-14 | 1997-04-15 | 1997-10-15 | $7700.00 | Window Closed / Lapsed |