US5087329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for separating pentafluoroethane from a mixture of halogenated hydrocarbons containing chloropentafluoroethane
Assignee: EIDP Inc
•
Filing: 1991-05-16
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Granted: 1992-02-11
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Expires: 2011-05-16
Abstract
Abstract Separating pentafluoroethane from a mixture of pentafluoroethane and chloropentafluoroethane by adding a fluorocarbon extractive agent having 1-4 carbon atoms, and optionally containing hydrogen and/or chlorine, in an extractive distillation zone to recover pentafluoroethane substantially free of chloropentafluoroethane in the overhead product stream.
Inventors
- 👤 Vinci M. Felix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:28
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/38; C07C17/383; C07C17/386
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
88 words
A process for separating pentafluoroethane from a first mixture of pentafluoroethane and chloropentafluoroethane which comprises: adding a fluorocarbon extractive agent having 1-4 carbon atoms optionally containing hydrogen and/or chlorine, and having a boiling point greater than -39° C., and less than about 50° C., to the first mixture in order to form a resultant second mixture; separating pentafluoroethane from chloropentafluoroethane of the second mixture by extractively distilling the second mixture in an extractive distillation zone and thereby recovering, as overhead product, a pentafluoroethane stream substantially free of chloropentafluoroethane.
Claim 2
Dependent Claim
88 words
A process for separating pentafluoroethane from a first mixture of pentafluoroethane and chloropentafluoroethane which comprises: adding a fluorocarbon extractive agent having 1-4 carbon atoms optionally containing hydrogen and/or chlorine, and having a boiling point greater than -39° C., and less than about 50° C., to the first mixture in order to form a resultant second mixture; separating pentafluoroethane from chloropentafluoroethane of the second mixture by extractively distilling the second mixture in an extractive distillation zone and thereby recovering, as overhead product, a pentafluoroethane stream substantially free of chloropentafluoroethane.
Claim 3
Dependent Claim
11 words
A process of claim 1 wherein the extractive agent is 1,2-dichlorotetrafluoroethane.
Claim 4
Dependent Claim
11 words
A process of claim 1 wherein the extractive agent is 1,1-dichlorotetrafluoroethane.
Claim 5
Dependent Claim
11 words
A process of claim 1 wherein the extractive agent is 2-chloro-1,1,1,2-tetrafluoroethane.
Claim 6
Dependent Claim
11 words
A process of claim 1 wherein the extractive agent is 2,2-dichloro-1,1,1-trifluoroethane.
Claim 7
Dependent Claim
11 words
A process of claim 1 wherein the extractive agent is 1,1,2-trichlorotrifluoroethane.
Claim 8
Dependent Claim
11 words
A process of claim 1 wherein the extractive agent is 1,1,1-trichlorotrifluoroethane.
Claim 9
Dependent Claim
11 words
A process of claim 1 wherein the extractive agent is trichlorofluoromethane.
Claim 10
Dependent Claim
11 words
A process of claim 1 wherein the extractive agent is octafluorocyclobutane.
References Cited (Backward Citations)
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Cited
US3689373A
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US3689374A
Cited
US3692635A
Cited
US3732150A
Cited
US4950364A
Cited
US4975156A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-02-10 | 1995-08-12 | 1996-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-10 | 1999-08-12 | 2000-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-10 | 2003-08-12 | 2004-02-11 | $7700.00 | Window Closed / Lapsed |