US4749518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extraction of cesium and strontium from nuclear waste
Assignee: University of South Carolina
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Filing: 1985-08-06
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Granted: 1988-06-07
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Expires: 2005-08-06
Abstract
Abstract Cesium is extracted from acidified nuclear waste by contacting the waste with a bis 4,4'(5) [1-hydroxy-2-ethylhexyl]benzo 18-crown-6 compound and a cation exchanger in a matrix solution. Strontium is extracted from acidified nuclear waste by contacting the waste with a bis 4,4'(5') [1-hydroxyheptyl]cyclohexo 18-crown-6 compound, and a cation exchanger in a matrix solution.
Inventors
- 👤 Milton W. Davis, Jr.
- 👤 Charles B. Bowers, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:56
CPC Classifications
G; G21; G21C; G21C19/00; G21C19/42; G21C19/44; G21C19/46; C; C01; C01F; C01F11/00; C01F11/005; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/302; C22B3/304; Y; Y02; Y02E; Y02E30/00; Y02E30/30; Y02P; Y02P10/00; Y02P10/20; Y02P20/00; Y02P20/10; Y02P20/129; Y02W; Y02W30/00; Y02W30/50
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
53 words
In a method for reprocessing nuclear waste, wherein the waste is dissolved in acidic solution and the actinides are removed, the improvement comprising separating cesium from the waste by contacting the waste with an extractant consisting essentially of bis 4,4',(5') benzo 18-crown-6, together with a sulfonic acid cation exchanger in a matrix solution.
Claim 2
Dependent Claim
53 words
In a method for reprocessing nuclear waste, wherein the waste is dissolved in acidic solution and the actinides are removed, the improvement comprising separating cesium from the waste by contacting the waste with an extractant consisting essentially of bis 4,4',(5') benzo 18-crown-6, together with a sulfonic acid cation exchanger in a matrix solution.
Claim 3
Dependent Claim
13 words
The improvement of claim 1, wherein the cation exchanger is dinonylnaphthalene sulfonic acid.
Claim 4
Dependent Claim
14 words
The improvement of claim 1, wherein the matrix solution comprises tributyl phosphate and kerosene.
Claim 5
Dependent Claim
54 words
In a method for reprocessing nuclear waste, wherein the waste is dissolved in acidic solution and the actinides are removed, the improvement comprising separating strontium from the waste by extracting the waste with an extractant consisting essentially of bis 4,4'(5') (1-hydroxyheptyl) cyclohexo 18-crown-6, together with a sulfonic acid cation exchanger in a matrix solution.
Claim 6
Dependent Claim
54 words
In a method for reprocessing nuclear waste, wherein the waste is dissolved in acidic solution and the actinides are removed, the improvement comprising separating strontium from the waste by extracting the waste with an extractant consisting essentially of bis 4,4'(5') (1-hydroxyheptyl) cyclohexo 18-crown-6, together with a sulfonic acid cation exchanger in a matrix solution.
Claim 7
Dependent Claim
13 words
The improvement of claim 4, wherein the cation exchanger is dinonylnaphthalene sulfonic acid.
Claim 8
Dependent Claim
14 words
The improvement of claim 4, wherein the matrix solution comprises tributyl phosphate and kerosene.
Claim 9
Dependent Claim
13 words
The improvement of claim 1, wherein the cation exchanger is didodecylnapthalene sulfonic acid.
Claim 10
Dependent Claim
13 words
The improvement of claim 4, wherein the cation exchanger is didodecylnaphthalene sulfonic acid.
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) | 1991-06-07 | 1991-12-07 | 1992-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-07 | 1995-12-07 | 1996-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-07 | 1999-12-07 | 2000-06-07 | $7700.00 | Window Closed / Lapsed |