US5171901A
Expired / Lapsed
US
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Process for the preparation of 1,1,1,3,3,3-hexafluoropropane and 2-chloro-1,1,1,3,3,3-hexafluoropropane
Assignee: Bayer AG
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Filing: 1991-12-05
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Granted: 1992-12-15
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Expires: 2011-12-05
Abstract
Abstract Hexafluoropropanes of the formula CF 3 -CHX-CF 3 where X is hydrogen or chlorine are prepared by reacting hexachloropropene with hydrogen fluoride in the gas phase in the presence of a catalyst.
Inventors
- 👤 Karl-Rudolf Gassen
- 👤 Dietmar Bielefeldt
- 👤 Albrecht Marhold
- 👤 Hans-Helmut Schwarz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:43
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/093; C07C17/20; C07C17/21; C07C17/23
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
59 words
A process for the preparation of hexafluoropropanes of the formula (I) CF.sub.3 --CHX--CF.sub.3 (I) in which X represents hydrogen or chlorine, in which process hexachloropropene is reacted with hydrogen fluoride in the gas phase in the presence of a catalyst containing a chromium (III) salt, in which the reaction is carried out at from about 250° to 600° C.
Claim 2
Dependent Claim
59 words
A process for the preparation of hexafluoropropanes of the formula (I) CF.sub.3 --CHX--CF.sub.3 (I) in which X represents hydrogen or chlorine, in which process hexachloropropene is reacted with hydrogen fluoride in the gas phase in the presence of a catalyst containing a chromium (III) salt, in which the reaction is carried out at from about 250° to 600° C.
Claim 3
Dependent Claim
21 words
The process of claim 1, in which 5 to 100 mol of hydrogen fluoride are used per 1 mol of hexachloropropene.
Claim 4
Dependent Claim
20 words
The process of claim 1, in which 1,1,1,3,3,3-hexafluoropropane is prepared by carrying out the reaction at 435° to 525° C.
Claim 5
Dependent Claim
20 words
The process of claim 1, in which 2-chloro-1,1,1,3,3,3-hexafluoropropane is prepared by carrying out the process at 325° to 415° C.
Claim 6
Dependent Claim
37 words
A process for the preparation of 1,1,1,3,3,3-hexafluoropropane, in which CF 3 --CCl 2 --CF 3 and/or CF 3 --CHCl--CF 3 separated off from the reaction product mixture resulting from the process of claim 1 is hydrogenated catalytically.
Claim 7
Dependent Claim
17 words
The process of claim 5 in which transition metals or support materials are used as hydrogenation catalyst.
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) | 1995-12-15 | 1996-06-15 | 1996-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-15 | 2000-06-15 | 2000-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-15 | 2004-06-15 | 2004-12-15 | $7700.00 | Window Closed / Lapsed |