US3271273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Distillation process for recovering anhydrous hydrogen fluoride
Assignee: Halcon Research and Development Corp
•
Filing: 1963-02-13
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Granted: 1966-09-06
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Expires: 1983-02-13
Abstract
No abstract record available.
Inventors
- 👤 Sherwood N Fox
- 👤 Martin B Sherwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:33
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/19; C01B7/191
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A PROCESS FOR RECOVERING ANHYDROUS HYDROGEN FLUORIDE BY DISTILLATION WHICH COMPRISES FORMING A TWO PHASE MIXTURE THEREOF WITH WATER AND A WATER IMMISCIBLE OXYGENATED ORGANIC LIQUID SELECTED FROM THE GROUP CONSISTING OF N-BUTANOL, METHYL ISPROPYL KETONE, METHYL ISOBUTYL KETONE, N-HEXANOL, OR CYCLOHEXANOL, EACH PHASE CONTAINING SOME OF THE HYROGEN FLUORIDE, RECOVERING ANHYDROUS HYDROGEN FLUORIDE AS OVERHEAD BY DISTILLATION FROM THE ORGANIC LIQIUID PHASE, REMOVING WATER FROM THE AQUEOUS PHASE BY DISTILLATION TO FORM AN AQUEOUS HYDROFLUORIC ACID AZEOTROPE AS BOTTOMS AND RETURING THE LATTER TO THE STEP OF FORMING THE SEPARATE LIQUID PHASES.
Claim 2
Dependent Claim
93 words
A PROCESS FOR RECOVERING ANHYDROUS HYDROGEN FLUORIDE BY DISTILLATION WHICH COMPRISES FORMING A TWO PHASE MIXTURE THEREOF WITH WATER AND A WATER IMMISCIBLE OXYGENATED ORGANIC LIQUID SELECTED FROM THE GROUP CONSISTING OF N-BUTANOL, METHYL ISPROPYL KETONE, METHYL ISOBUTYL KETONE, N-HEXANOL, OR CYCLOHEXANOL, EACH PHASE CONTAINING SOME OF THE HYROGEN FLUORIDE, RECOVERING ANHYDROUS HYDROGEN FLUORIDE AS OVERHEAD BY DISTILLATION FROM THE ORGANIC LIQIUID PHASE, REMOVING WATER FROM THE AQUEOUS PHASE BY DISTILLATION TO FORM AN AQUEOUS HYDROFLUORIC ACID AZEOTROPE AS BOTTOMS AND RETURING THE LATTER TO THE STEP OF FORMING THE SEPARATE LIQUID PHASES.
References Cited (Backward Citations)
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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) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |