Patent US2962357A successfully refreshed from Google Patents.
US2962357A
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Defluorination of phosphoric acid
Assignee: International Minerals and Chemical Corp
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Filing: 1957-02-18
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Granted: 1960-11-29
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Expires: 1977-02-18
Abstract
No abstract record available.
Inventors
- 👤 William B Williams
- 👤 Donald E Tynan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:11
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/234; C01B25/2343; Y; Y10; Y10S; Y10S71/00; Y10S71/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
A METHOD OF DEFLUORINATING FLUORINE-CONTAINING WET PROCESS PHOSPHORIC ACID CONTAINING AT LEAST 48% BY WEIGHT OF P2O5 AND AT LEAST 0.5% BY WEIGHT OF FLUORINE WHICH COMPRISES BOILING A LIQUID BODY OF SAID ACID BY INTRODUCING HOT COMBUSTION GASES OF A HYDROCARBON FUEL ISSUING FROM A BURNER MECHANISM BENEATH THE ACID SURFACE AND PASSING SAID HOT GASES THROUGH THE ACID, SAID COMBUSTION GASES BEING IN SUFFICIENT QUANTITY TO BOIL THE ACID BY THE DIRECT TRANSFER OF HEAT FROM THE COMBUSTION GASES TO THE ACID, AND, SIMULTANEOUS WITH THE INTRODUCTION OF SAID HOT COMBUSTION GASES,INTRODUCING STEAM BENEATH THE SURFACE OF THE LIQUID AT A TEMPERATURE ABOVE ABOUT 275*F. AND IN AN AMOUNT OF AT LEAST ABOUT 45 POUNDS OF STEAM PER UNIT OF P2O5 THEREBY EFFECTING AN EVOLUTION AND ENTRAINMENT OF FLUORINE IN THE STEAM AND COMBUSTION GASEOUS MIXTURE PASSING THROUGH SAID ACID AND INCREASING THE P/F RATIO OF THE ACID TO AT LEAST 100.
Claim 2
Independent Claim
154 words
A METHOD OF DEFLUORINATING FLUORINE-CONTAINING WET PROCESS PHOSPHORIC ACID CONTAINING AT LEAST 48% BY WEIGHT OF P2O5 AND AT LEAST 0.5% BY WEIGHT OF FLUORINE WHICH COMPRISES BOILING A LIQUID BODY OF SAID ACID BY INTRODUCING HOT COMBUSTION GASES OF A HYDROCARBON FUEL ISSUING FROM A BURNER MECHANISM BENEATH THE ACID SURFACE AND PASSING SAID HOT GASES THROUGH THE ACID, SAID COMBUSTION GASES BEING IN SUFFICIENT QUANTITY TO BOIL THE ACID BY THE DIRECT TRANSFER OF HEAT FROM THE COMBUSTION GASES TO THE ACID, AND, SIMULTANEOUS WITH THE INTRODUCTION OF SAID HOT COMBUSTION GASES,INTRODUCING STEAM BENEATH THE SURFACE OF THE LIQUID AT A TEMPERATURE ABOVE ABOUT 275*F. AND IN AN AMOUNT OF AT LEAST ABOUT 45 POUNDS OF STEAM PER UNIT OF P2O5 THEREBY EFFECTING AN EVOLUTION AND ENTRAINMENT OF FLUORINE IN THE STEAM AND COMBUSTION GASEOUS MIXTURE PASSING THROUGH SAID ACID AND INCREASING THE P/F RATIO OF THE ACID TO AT LEAST 100.
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) | 1963-11-29 | 1964-05-30 | 1964-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-29 | 1968-05-30 | 1968-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-29 | 1972-05-30 | 1972-11-29 | $7700.00 | Window Closed / Lapsed |