US3873629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of chlorodifluoromethane and hydrogen
Assignee: EIDP Inc
•
Filing: 1974-01-23
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Granted: 1975-03-25
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Expires: 1994-01-23
Abstract
Abstract A continuous process for separating mixtures of hydrogen fluoride and chlorodifluoromethane by countercurrently contacting an upwardly flowing gaseous mixture of these components with downwardly flowing concentrated sulfuric acid wherein the lower region of the zone of contact is about from 25* to 100*C. warmer than the upper region of the zone.
Inventors
- 👤 James B Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:19
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/14; B01D53/1487; B01D53/1493; C; C01; C01B; C01B7/00; C01B7/19; C01B7/191; C01B7/195; C07; C07C; C07C17/00; C07C17/38
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
114 words
A PROCESS COMPRISING BRINING INTO CONTACT, IN A CHAMBER HAVING A LOWER AND AN UPPER END, A DOWNWARD FLOWING STREAM CONSISTING ESSENTIALLY OF CONCENTRATED LIQUID SULFURIC ACID AND AN UPWARD FLOWING STREAM CONSISTING ESSENTIALLY OF A GASEOUS MIXTURE OF HYDROGEN FLUORIDE AND CHLORODIFLUOROMETHANE, THE CHAMBER BEING MAINTAINED AT A TEMPERATURE BOVE THE BOILING POINT OF BOTH HYDROGEN FLUORIDE AND CHLORODIFLUOROMETHANE, THE LOWER END OF THE CHAMBER BEING MAINTAINED AT A TEMPERATURE ABOUT FROM 25 TO100 CENTIGRADE DEGREES HIGHER THAN THE - UPPER END OF THE CHAMBER; AND REMOVING PURIFIED CHLORODIFLUOROMETHANE FROM THE UPPER END OF THE CHAMBER AND A MIXTURE OF CONCENTRATED SULFURIC ACID AND HYDROGEN FLUORIDE FROM THE LOWER END OF THE CHAMBER.
Claim 2
Dependent Claim
114 words
A PROCESS COMPRISING BRINING INTO CONTACT, IN A CHAMBER HAVING A LOWER AND AN UPPER END, A DOWNWARD FLOWING STREAM CONSISTING ESSENTIALLY OF CONCENTRATED LIQUID SULFURIC ACID AND AN UPWARD FLOWING STREAM CONSISTING ESSENTIALLY OF A GASEOUS MIXTURE OF HYDROGEN FLUORIDE AND CHLORODIFLUOROMETHANE, THE CHAMBER BEING MAINTAINED AT A TEMPERATURE BOVE THE BOILING POINT OF BOTH HYDROGEN FLUORIDE AND CHLORODIFLUOROMETHANE, THE LOWER END OF THE CHAMBER BEING MAINTAINED AT A TEMPERATURE ABOUT FROM 25 TO100 CENTIGRADE DEGREES HIGHER THAN THE - UPPER END OF THE CHAMBER; AND REMOVING PURIFIED CHLORODIFLUOROMETHANE FROM THE UPPER END OF THE CHAMBER AND A MIXTURE OF CONCENTRATED SULFURIC ACID AND HYDROGEN FLUORIDE FROM THE LOWER END OF THE CHAMBER.
Claim 3
Dependent Claim
24 words
A process of claim 1 wherein the temperature of the lower end of the chamber is about 75* C higher than the upper end.
Claim 4
Dependent Claim
20 words
A process of claim 2 wherein the lower end of the chamber is maintained at a temperature of about 100*C.
Claim 5
Dependent Claim
20 words
A process of claim 1 wherein the mixture of chlorodifluoromethane and hydrogen fluoride comprises about 3 weight percent hydrogen fluoride.
References Cited (Backward Citations)
US2371341A
Cited
US2613232A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |