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Patent US4439326A successfully refreshed from Google Patents.
US4439326A
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Process for removing ammonium nitrate from aqueous solutions
Assignee: Karlsruher Institut für Technologie
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Filing: 1981-12-08
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Granted: 1984-03-27
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Expires: 2001-12-08
Abstract
Abstract A process for removing ammonium nitrate NH4NO3 (AN) from an aqueous solution. At least one nitrogen-oxygen (N-O) compound in the form of NOx and/or N2O2x, where x=1 or 2, is added to the aqueous solution containing the AN, the N-O compound being in gaseous or liquid state or as an ion present in an aqueous solution, at a temperature above room temperature but below the boiling point of the solution containing the AN and under normal pressure.
Inventors
- 👤 Michael Heilgeist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:23
CPC Classifications
G; G21; G21F; G21F9/00; G21F9/04; G21F9/06; C; C02; C02F; C02F1/00; C02F1/70; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/903
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
78 words
Process for removing ammonium nitrate of NH 4 NO 3 (AN) from an aqueous solution, comprising adding at least one nitrogen-oxygen (N-O) compound which is a nitrous oxide in the form of NO, NO 2 or N 2 O 4 , to the aqueous solution containing the AN, the N-O compound being in gaseous or liquid state, at a temperature above room temperature but below the boiling point of the solution containing the AN and under normal pressure.
Claim 2
Dependent Claim
78 words
Process for removing ammonium nitrate of NH 4 NO 3 (AN) from an aqueous solution, comprising adding at least one nitrogen-oxygen (N-O) compound which is a nitrous oxide in the form of NO, NO 2 or N 2 O 4 , to the aqueous solution containing the AN, the N-O compound being in gaseous or liquid state, at a temperature above room temperature but below the boiling point of the solution containing the AN and under normal pressure.
Claim 3
Dependent Claim
52 words
Method as defined in claim 1, wherein the nitrogen-oxygen compound is introduced into the aqueous AN containing solution in a quantity which corresponds to a Mol ratio of N-O compound to AN in a range between 1 Mol N-O compound to 1 Mol AN to 4 Mol N-O to 1 Mol AN.
Claim 4
Dependent Claim
33 words
Process as defined in claim 1, wherein during the reaction with the N-O compound, the temperature of the solution containing the AN is maintained in a range between 50° C. and 100° C.
Claim 5
Dependent Claim
26 words
Process as defined in claim 3, wherein the temperature of the solution containing the AN is maintained in a range between 50° C. and 90° C.
Claim 6
Dependent Claim
31 words
Process as defined in claim 1, wherein during the reaction with NO compound, the temperature of the solution containing the AN is maintained in a range between 70° and 90° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-27 | 1987-09-26 | 1988-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-27 | 1991-09-26 | 1992-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-27 | 1995-09-26 | 1996-03-27 | $7700.00 | Window Closed / Lapsed |