US3673086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing nitric acid, nitrate ions and nitrite ions out of aqueous waste solutions
Assignee: Gesellschaft fuer Kernforschung mbH
•
Filing: 1970-07-08
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Granted: 1972-06-27
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Expires: 1990-07-08
Abstract
Abstract Nitric acid, nitrate ions and nitrite ions are removed from aqueous radioactive waste solutions by treating such solutions with reducing agent.
Inventors
- 👤 Stephan Drobnik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:32
CPC Classifications
G; G21; G21F; G21F9/00; G21F9/04; G21F9/06; C; C02; C02F; C02F1/00; C02F1/70; C02F2101/00; C02F2101/006
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
18 words
A method according to claim 1 wherein the heated aqueous solution of a reducing agent is boiling .
Claim 2
Dependent Claim
19 words
A method according to claim 1 wherein the aqueous waste solution is an aqueous high level radioactive waste solution.
Claim 3
Dependent Claim
28 words
A method according to claim 3 wherein the reducing agent consists essentially of 98 percent formic acid and the heated aqueous solution of said reducing agent is boiling.
Claim 4
Dependent Claim
41 words
A method according to claim 1 wherein offgases produced in the reaction of said waste solution with said reducing agent are free from higher nitric oxides and the aqueouS solution of a reducing agent consists essentially of 98 percent formic acid.
Claim 5
Dependent Claim
21 words
A method according to claim 5 wherein the aqueous waste solution is an aqueous high or intermediate level radioactive waste solution.
Claim 6
Dependent Claim
44 words
A method according to claim 6 wherein the waste solution is a nitric acid bearing waste solution and the formic acid is in a molar amount which is at least twice that of the hydrogen ion concentration of the nitric acid bearing waste solution.
Claim 7
Dependent Claim
30 words
A method according to claim 6 wherein the radioactive waste solution contains radioactive iodine and which comprises passing the offgases through a filter and then discharging them into ambient air.
Claim 8
Dependent Claim
19 words
A method according to claim 6 wherein the aqueous waste solution is a high level radioactive waste solution .
Claim 9
Dependent Claim
17 words
A method according to claim 9 wherein the heated aqueous solution of a reducing agent is boiling.
References Cited (Backward Citations)
US2902340A
Cited
US3429103A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |