US2830877A
Expired / Lapsed
US
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Recovery of platinum from alumina base platinum catalyst
Assignee: Universal Oil Products Co
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Filing: 1954-02-25
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Granted: 1958-04-15
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Expires: 1974-02-25
Abstract
No abstract record available.
Inventors
- 👤 Herbert R Appell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:47
CPC Classifications
C; C01; C01G; C01G55/00; B; B01; B01J; B01J23/00; B01J23/90; B01J23/96; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A PROCESS FOR SEPARATING PLATINUM FROM A USED CATALYST COMPRISING PLATINUM SUPPORTED ON GAMMA ALUMINA, WHICH COMPRISES HEATING SAID CATALYST AT A TEMPERATURE IN EXCESS OF 1600*F. FOR A SUFFICIENT TIME TO CONVERT THE GAMMA ALUMINA TO ALPHA ALUMINA, WHEREBY THE ALUMINA IS RENDERED INSOLUBLE IN AQUA REGIA, SUBSEQUENTLY DIGESTING THE CATALYST WITH AQUA REGIA TO DISSOLVE THE PLATINUM WITHOUT DISSOLVING THE ALPHA ALUMINA, AND SEPARATING THE DISSOLVED PLATINUM FROM THE UNDISSOLVED ALPHA ALUMINA.
Claim 2
Dependent Claim
74 words
A PROCESS FOR SEPARATING PLATINUM FROM A USED CATALYST COMPRISING PLATINUM SUPPORTED ON GAMMA ALUMINA, WHICH COMPRISES HEATING SAID CATALYST AT A TEMPERATURE IN EXCESS OF 1600*F. FOR A SUFFICIENT TIME TO CONVERT THE GAMMA ALUMINA TO ALPHA ALUMINA, WHEREBY THE ALUMINA IS RENDERED INSOLUBLE IN AQUA REGIA, SUBSEQUENTLY DIGESTING THE CATALYST WITH AQUA REGIA TO DISSOLVE THE PLATINUM WITHOUT DISSOLVING THE ALPHA ALUMINA, AND SEPARATING THE DISSOLVED PLATINUM FROM THE UNDISSOLVED ALPHA ALUMINA.
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) | 1961-04-14 | 1961-10-14 | 1962-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-14 | 1965-10-14 | 1966-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-14 | 1969-10-14 | 1970-04-15 | $7700.00 | Window Closed / Lapsed |