US3195979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing hydrogen fluoride from fluosilicic acid
Assignee: International Minerals and Chemical Corp
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Filing: 1961-12-18
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Granted: 1965-07-20
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Expires: 1981-12-18
Abstract
No abstract record available.
Inventors
- 👤 George M Burkert
- 👤 Arthur N Baumann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:27
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/16; C01C1/162; C01B; C01B7/00; C01B7/19; C01B7/191; C01B7/193
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
209 words
A PROCESS FOR PREPARING HYDROGEN FLUORIDE FROM FLUOSILICIC ACID WHICH COMPRISES THE FOLLOWING STEPS: (A) REACTING FLUOSILICIC ACID WITH AMMONIA TO FORM AMMONIUM FLUORIDE AND SILICA, (B) SEPARATING SAID SILICA FROM SAID AMMONIUM FLUORIDE, (C) INTRODUCING SAID SEPARATED AMMONIUM FLUORIDE AND AN ALKALI METAL FLUORIDE INTO A TREATING ZONE WHEREIN SAID AMMONIUM FLUORIDE AND SAID ALKALI METAL FLUORIDE ARE SUBJECTED TO TREATING CONDITIONS TO REACT A FLUORIDE OF AMMONIA WITH SAID ALKALI METAL FLUORIDE TO FORM AN ALKALI METAL BIFLUORIDE, (D) SEPARATING SAID ALKALI METAL BIFLUORIDE FROM THE MIXTURE RESULTING FROM STEP (C), (E) HEATING SAID SEPARATED ALKALI METAL BIFLUORIDE TO A TEMPERATURE AT LEAST SUFFICIENTLY HIGH TO PRODUCE AN ALKALI METAL BIFLUORIDE SUBSTANTIALLY FREE OF AMMONIA AND AMMONIUM FLUORIDE AND BELOW THAT AT WHICH SUBSTANTIAL DECOMPOSITION OF SAID ALKALI METAL BIFLUORIDE IS EFFECTED, (F) HEATING THE ALKALI METAL BIFLUORIDE SUBSTANTIALLY FREE OF AMMONIA AND AMMONIUM FLUORIDE FROM STEP (E) TO A TEMPERATURE SUFFICIENTLY HIGH TO DECOMPOSE SAID ALKALI METAL BIFLUORIDE TO FORM HYDROGEN FLUORIDE AND ALKALI METAL FLUORIDE, (G) SEPARATING SAID ALKALI METAL FLUORIDE AND SAID HYDROGEN FLUORIDE PRODUCED BY THE HEATING THE STEP (F), (H) RECYCLING SAID ALKALI METAL FLUORIDE SEPARATED IN STEP (G) TO STEP (C), AND (I) RECOVERING SAID HYDROGEN FLUORIDE SEPARATED IN STEP (G).
Claim 2
Dependent Claim
209 words
A PROCESS FOR PREPARING HYDROGEN FLUORIDE FROM FLUOSILICIC ACID WHICH COMPRISES THE FOLLOWING STEPS: (A) REACTING FLUOSILICIC ACID WITH AMMONIA TO FORM AMMONIUM FLUORIDE AND SILICA, (B) SEPARATING SAID SILICA FROM SAID AMMONIUM FLUORIDE, (C) INTRODUCING SAID SEPARATED AMMONIUM FLUORIDE AND AN ALKALI METAL FLUORIDE INTO A TREATING ZONE WHEREIN SAID AMMONIUM FLUORIDE AND SAID ALKALI METAL FLUORIDE ARE SUBJECTED TO TREATING CONDITIONS TO REACT A FLUORIDE OF AMMONIA WITH SAID ALKALI METAL FLUORIDE TO FORM AN ALKALI METAL BIFLUORIDE, (D) SEPARATING SAID ALKALI METAL BIFLUORIDE FROM THE MIXTURE RESULTING FROM STEP (C), (E) HEATING SAID SEPARATED ALKALI METAL BIFLUORIDE TO A TEMPERATURE AT LEAST SUFFICIENTLY HIGH TO PRODUCE AN ALKALI METAL BIFLUORIDE SUBSTANTIALLY FREE OF AMMONIA AND AMMONIUM FLUORIDE AND BELOW THAT AT WHICH SUBSTANTIAL DECOMPOSITION OF SAID ALKALI METAL BIFLUORIDE IS EFFECTED, (F) HEATING THE ALKALI METAL BIFLUORIDE SUBSTANTIALLY FREE OF AMMONIA AND AMMONIUM FLUORIDE FROM STEP (E) TO A TEMPERATURE SUFFICIENTLY HIGH TO DECOMPOSE SAID ALKALI METAL BIFLUORIDE TO FORM HYDROGEN FLUORIDE AND ALKALI METAL FLUORIDE, (G) SEPARATING SAID ALKALI METAL FLUORIDE AND SAID HYDROGEN FLUORIDE PRODUCED BY THE HEATING THE STEP (F), (H) RECYCLING SAID ALKALI METAL FLUORIDE SEPARATED IN STEP (G) TO STEP (C), AND (I) RECOVERING SAID HYDROGEN FLUORIDE SEPARATED IN STEP (G).
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) | 1968-07-19 | 1969-01-18 | 1969-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-19 | 1973-01-18 | 1973-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-19 | 1977-01-18 | 1977-07-20 | $7700.00 | Window Closed / Lapsed |