US2943914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of recovering fluorine from waste gases
Assignee: Aluminium Industrie AG
•
Filing: 1958-03-24
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Granted: 1960-07-05
•
Expires: 1978-03-24
Abstract
No abstract record available.
Inventors
- 👤 Moser Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:46
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/48; C01F7/50; C01F7/54; A; A47; A47J; A47J47/00; A47J47/02; A47J47/08; A47J47/12; B; B01; B01D; B01D47/00; B01D47/06; B01D53/00; B01D53/34; B01D53/46; B01D53/68; B65; B65D; B65D43/00; B65D43/02; C01B; C01B7/00; C01B7/19; C01B7/191; Y; Y02; Y02C; Y02C20/00; Y02C20/30; Y02P; Y02P70/00; Y02P70/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
THE PROCESS OF RECOVERING FLUORINE FROM WASTE GASES PRODUCED IN THE ELECTROLYTIC PRODUCTION OF ALUMINUM FROM A FLOURIDE-CONTAINING FUSED SALT BATH IN AN ELECTROLYTIC CELL OPERATED WITH SELF-BAKING ANODES, AND CONTAINING SULPHUR DIOXIDE AND HYDROFLUORIC ACID, COMPRISING ADDING AIR TO THE WASTE GASES AND BURNING CARBON MONOXIDE AND TAR PRODUCTS IN A COMBUSTION CHAMBER, DEPOSITING DUST AND CARBON BLACK IN A CYCLONE, COOLING THE GASES TO ABOUT 40*C.-30*C., WASHING THE WASTE GASES WITH WATER, INITIALLY CONTAINING SUBSTANTIALLY NO SOLUTES, UNTILL A SOLUTION CONTAINING FROM 3% TO 10% HYDROFLUORIC ACID IS OBTAINED, AND REACTING SAID SOLUTION WITH ALUMINUM AND SODIUM CONTAINING COMPOUNDS TO PRECIPITATE A SODIUM ALUMINUM DOUBLE FLUORIDE.
Claim 2
Dependent Claim
108 words
THE PROCESS OF RECOVERING FLUORINE FROM WASTE GASES PRODUCED IN THE ELECTROLYTIC PRODUCTION OF ALUMINUM FROM A FLOURIDE-CONTAINING FUSED SALT BATH IN AN ELECTROLYTIC CELL OPERATED WITH SELF-BAKING ANODES, AND CONTAINING SULPHUR DIOXIDE AND HYDROFLUORIC ACID, COMPRISING ADDING AIR TO THE WASTE GASES AND BURNING CARBON MONOXIDE AND TAR PRODUCTS IN A COMBUSTION CHAMBER, DEPOSITING DUST AND CARBON BLACK IN A CYCLONE, COOLING THE GASES TO ABOUT 40*C.-30*C., WASHING THE WASTE GASES WITH WATER, INITIALLY CONTAINING SUBSTANTIALLY NO SOLUTES, UNTILL A SOLUTION CONTAINING FROM 3% TO 10% HYDROFLUORIC ACID IS OBTAINED, AND REACTING SAID SOLUTION WITH ALUMINUM AND SODIUM CONTAINING COMPOUNDS TO PRECIPITATE A SODIUM ALUMINUM DOUBLE FLUORIDE.
References Cited (Backward Citations)
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US2783128A
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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) | 1963-07-05 | 1964-01-04 | 1964-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-05 | 1968-01-04 | 1968-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-05 | 1972-01-04 | 1972-07-05 | $7700.00 | Window Closed / Lapsed |