US4917825A
Expired / Lapsed
US
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Solvent composition and process for the isolation of radium
Assignee: United States Department of Energy
•
Filing: 1988-10-05
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Granted: 1990-04-17
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Expires: 2008-10-05
Abstract
Abstract A solvent extraction composition for radium including a high molecular weight organophilic carboxylic acid and an organophilic macrocycle dissolved in a suitable solvent.
Inventors
- 👤 William J. McDowell
- 👤 Gerald N. Case
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:15
CPC Classifications
G; G21; G21F; G21F9/00; G21F9/007; C; C22; C22B; C22B60/00; C22B60/02; C22B60/0204; C22B60/0217; C22B60/0252; C22B60/026; Y; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
19 words
A solvent composition for extracting radium which comprises a high molecular weight organophilic carboxylic acid and an organophilic macrocycle.
Claim 2
Dependent Claim
19 words
A solvent composition for extracting radium which comprises a high molecular weight organophilic carboxylic acid and an organophilic macrocycle.
Claim 3
Dependent Claim
20 words
The solvent extraction composition of claim 1 wherein said organophilic carboxylic acid component has a molecular weight greater than 250.
Claim 4
Dependent Claim
14 words
The composition of claim 2 wherein said molecular weight ranges from 250 to 500.
Claim 5
Dependent Claim
16 words
The composition of claim 1 wherein said organophilic carboxylic acid is tri-substituted on the beta carbon.
Claim 6
Dependent Claim
13 words
The composition of claim 1 wherein said organophilic carboxylic acid comprises 2-methyl-2-heptyl-nonanoic acid.
Claim 7
Dependent Claim
16 words
The composition of claim 1 wherein said organophilic macrocyclic compound comprises an organophilic crown ether macrocycle.
Claim 8
Dependent Claim
11 words
The composition of claim 6 wherein said organophilic macrocycle comprises -dicyclohexano-21-crown-7.
Claim 9
Dependent Claim
23 words
The composition of claim 1 wherein said macrocyclic compound has a cavity of a size such that the radium ion will fit therein.
Claim 10
Dependent Claim
77 words
A solvent extraction process for the selective separation and isolation of radium which comprises, providing a solvent phase extraction composition comprised of an organophilic carboxylic acid and an organophilic macrocycle component, mixing said composition with an aqueous phase containing said radium, said aqueous phase having a pH of greater than 7 until a state of equilibration is reached between the two said phases and separating said organic solvent phase containing said radium from said basic aqueous phase.
Claim 11
Dependent Claim
77 words
A solvent extraction process for the selective separation and isolation of radium which comprises, providing a solvent phase extraction composition comprised of an organophilic carboxylic acid and an organophilic macrocycle component, mixing said composition with an aqueous phase containing said radium, said aqueous phase having a pH of greater than 7 until a state of equilibration is reached between the two said phases and separating said organic solvent phase containing said radium from said basic aqueous phase.
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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) | 1993-04-16 | 1993-10-16 | 1994-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-16 | 1997-10-16 | 1998-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-16 | 2001-10-16 | 2002-04-17 | $7700.00 | Window Closed / Lapsed |