Patent US4077800A successfully refreshed from Google Patents.
US4077800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the recovery of platinum from spent catalysts
Assignee: University of Chemistry and Technology
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Filing: 1976-12-17
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Granted: 1978-03-07
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Expires: 1996-12-17
Abstract
Abstract An economical procedure for the recovery of platinum from a spent catalyst involves subjecting the catalyst to fluorination with elementary fluorine or a mixture thereof with hydrogen fluoride at a temperature ranging from 100°-600° C. The resultant platinum fluoride is then converted to platinum in elemental form.
Inventors
- 👤 Ivo Peka
- 👤 Ludek Vodicka
- 👤 Jan Ulrich
- 👤 Jan Hajek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:48
CPC Classifications
C; C22; C22B; C22B11/00; C01; C01G; C01G55/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
64 words
Method for recovering platinum from spent platinum containing catalysts which comprises the steps of fluorinating the spent catalyst at a temperature within the range of 100°-300° C to yield non-volatile platinum fluoride; decomposing said platinum fluoride with a mineral acid at a temperature within the range of 90°-100° C to yield a solution containing dissolved platinum and reducing said dissolved platinum to metallic platinum.
Claim 2
Dependent Claim
64 words
Method for recovering platinum from spent platinum containing catalysts which comprises the steps of fluorinating the spent catalyst at a temperature within the range of 100°-300° C to yield non-volatile platinum fluoride; decomposing said platinum fluoride with a mineral acid at a temperature within the range of 90°-100° C to yield a solution containing dissolved platinum and reducing said dissolved platinum to metallic platinum.
Claim 3
Dependent Claim
13 words
Method in accordance with claim 1 wherein fluorination is effected with elementary fluorine.
Claim 4
Dependent Claim
18 words
Method in accordance with claim 1 wherein fluorination is effected with a mixture of fluorine and hydrogen fluoride.
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) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |