Patent US4404130A successfully refreshed from Google Patents.
US4404130A
Expired / Lapsed
US
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Process for the plutonium decontamination of an organic solvent
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1981-03-11
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Granted: 1983-09-13
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Expires: 2001-03-11
Abstract
Abstract Process for the plutonium decontamination of an organic solvent comprising adding to the said organic solvent a reducing agent which is a dialkyl dithiophosphoric acid and which is soluble in the organic solvent, bringing the organic solvent containing the reducing agent into contact with an acid aqueous solution and separating the aqueous solution containing the plutonium from the decontaminated organic solvent, useful in reprocessing of irradiated nuclear fuels.
Inventors
- 👤 Richard Fitoussi
- 👤 Claude Musikas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:45
CPC Classifications
G; G21; G21F; G21F9/00; G21F9/04; G21F9/06; G21F9/12; G21F9/125
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
58 words
A process for the plutonium decontamination of an organic solvent, comprising adding to said organic solvent a reducing agent which is soluble therein and consists of a dialkyl dithiophosphoric acid, bringing the organic solvent containing the reducing agent into contact with an acid aqueous solution and separating the aqueous solution containing the plutonium from the decontaminated organic solvent.
Claim 2
Dependent Claim
58 words
A process for the plutonium decontamination of an organic solvent, comprising adding to said organic solvent a reducing agent which is soluble therein and consists of a dialkyl dithiophosphoric acid, bringing the organic solvent containing the reducing agent into contact with an acid aqueous solution and separating the aqueous solution containing the plutonium from the decontaminated organic solvent.
Claim 3
Dependent Claim
15 words
A process according to claim 1, wherein the dialkyl dithiophosphoric acid is diethyl dithiophosphoric acid.
Claim 4
Dependent Claim
14 words
A process according to claim 1, wherein the dialkyl dithiophosphoric acid is dibutyldithiophosphoric acid.
Claim 5
Dependent Claim
28 words
A process according to claim 1, wherein the acid aqueous solution is a mineral acid selected from the group consisting of nitric acid, hydrochloric acid or sulphuric acid.
Claim 6
Dependent Claim
19 words
A process according to claim 1, wherein the acid aqueous solution has an acidity between 0.01 and 1 N.
Claim 7
Dependent Claim
31 words
A process according to claim 1, wherein the organic solvent containing the reducing agent is brought into contact with the acid aqueous solution at a temperature between 10° and 60° C.
Claim 8
Dependent Claim
60 words
A process according to claim 1, wherein the decontaminated organic solvent undergoes a complementary purification treatment in order to eliminate excess reducing agent and oxidation products formed in the solvent from said reducing agent, said treatment consisting of bringing the decontaminated organic solvent into contact with a basic solution and separating the basic solution from the purified decontaminated organic solvent.
Claim 9
Dependent Claim
15 words
A process according to claim 7, wherein the basic solution is a sodium carbonate solution.
Claim 10
Dependent Claim
18 words
A process according to claims 7 or 8, wherein an oxidizing agent is added to the basic solution.
Claim 11
Dependent Claim
13 words
A process according to claim 9, wherein the oxidizing agent is sodium nitrite.
Claim 12
Dependent Claim
12 words
A process according to claim 1, wherein the organic solvent comprises tributylphosphate.
Claim 13
Dependent Claim
16 words
A process according to claim 1, wherein the acid aqueous solution is a mineral acid solution.
References Cited (Backward Citations)
US3580705A
Cited
US3980750A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-12 | 1987-03-14 | 1987-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-12 | 1991-03-14 | 1991-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-12 | 1995-03-14 | 1995-09-13 | $7700.00 | Window Closed / Lapsed |