Patent US4765909A successfully refreshed from Google Patents.
US4765909A
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Ion exchange method for separation of scandium and thorium
Assignee: Osram Sylvania Inc
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Filing: 1987-04-23
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Granted: 1988-08-23
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Expires: 2007-04-23
Abstract
Abstract A method for a quantitative separation of scandium from thorium comprises adsorption of both metals on a cation exchange resin followed by selective elution of scandium with an acidic solution of a chelating agent followed by the elution of thorium by a six normal hydrochloric acid solution.
Inventors
- 👤 William J. Rourke
- 👤 Wen-Chao Lai
- 👤 Samuel Natansohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:46
CPC Classifications
C; C01; C01F; C01F15/00; B; B01; B01J; B01J39/00; B01J39/04; B01J39/05; C01F17/00; C01F17/10; C01F17/13; C22; C22B; C22B3/00; C22B3/20; C22B3/42; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/14
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
110 words
A method for separating scandium and thorium comprising the following steps: Step 1--adjusting a solution comprising scandium and thorium to an acidic pH to form an acid solution having a pH of about 1.95; Step 2--contacting the acid solution from step 1 with a cation exchange resin, said cation exchange resin having a sulfonic acid functionality; Step 3--retaining said scandium and thorium on said cation exchange resin; Step 4--eluting said scandium from said cation exchange resin with a first elution solution comprising about 0.1M diglycolic acid and 1.2M hydrochloric acid; and Step 5--eluting said thorium from said cation exchange resin with a second elution solution comprising about 6N hydrochloric acid.
Claim 2
Independent Claim
110 words
A method for separating scandium and thorium comprising the following steps: Step 1--adjusting a solution comprising scandium and thorium to an acidic pH to form an acid solution having a pH of about 1.95; Step 2--contacting the acid solution from step 1 with a cation exchange resin, said cation exchange resin having a sulfonic acid functionality; Step 3--retaining said scandium and thorium on said cation exchange resin; Step 4--eluting said scandium from said cation exchange resin with a first elution solution comprising about 0.1M diglycolic acid and 1.2M hydrochloric acid; and Step 5--eluting said thorium from said cation exchange resin with a second elution solution comprising about 6N hydrochloric acid.
Claim 3
Dependent Claim
24 words
A method for separating scandium and thorium in accordance with claim 1 wherein step 1 through step 5 is carried out at ambient temperatures.
References Cited (Backward Citations)
US2874039A
Cited
US2925431A
Cited
US3013859A
Cited
US3146063A
Cited
US3575687A
Cited
US4459268A
Cited
US4624703A
Cited
US4626280A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-23 | 1992-02-22 | 1992-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-23 | 1996-02-22 | 1996-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-23 | 2000-02-22 | 2000-08-23 | $7700.00 | Window Closed / Lapsed |