Patent US5986151A successfully refreshed from Google Patents.
US5986151A
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Fluorinated propenes from pentafluoropropane
Assignee: Honeywell International Inc
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Filing: 1998-08-28
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Granted: 1999-11-16
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Expires: 2018-08-28
Abstract
Abstract A process for the preparation of fluorinated propanes and propenes. CF 3 CH═CH 2 is produced from CF 3 CH 2 CHF 2 by the sequential steps of dehydrofluorination, a reduction, and a second dehydrofluorination in which the same catalyst is preferably used for each step. Preferably the catalysts is palladium on carbon. The process provides the steps of passing CF 3 CH 2 CHF 2 over a Pd/C catalyst to form CF 3 CH═CHF; hydrogenating CF 3 CH═CHF over a Pd/C catalyst to give CF 3 CH 2 CH 2 F; and passing CF 3 CH 2 CH 2 F over a Pd/C catalyst to give CF 3 CH═CH 2 .
Inventors
- 👤 Michael Van Der Puy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:14
CPC Classifications
C; C07; C07C; C07C21/00; C07C21/02; C07C21/18; C07C17/00; C07C17/25; C07C17/35; C07C17/354
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
47 words
A method for producing 1,1,1-trifluoropropene which comprises dehydrofluorinating 1,1,1,3,3-pentafluoropropane in the presence of a catalyst comprising palladium on carbon under conditions sufficient to thereby produce 1,1,1,3-tetrafluoropropene, and then reducing the 1,1,1,3-tetrafluoropropene under conditions sufficient to produce 1,1,1,3-tetrafluoropropane, and then dehydrofluorinating 1,1,1,3-tetrafluoropropane under conditions sufficient to produce 1,1,1,-trifluoropropene.
Claim 2
Independent Claim
47 words
A method for producing 1,1,1-trifluoropropene which comprises dehydrofluorinating 1,1,1,3,3-pentafluoropropane in the presence of a catalyst comprising palladium on carbon under conditions sufficient to thereby produce 1,1,1,3-tetrafluoropropene, and then reducing the 1,1,1,3-tetrafluoropropene under conditions sufficient to produce 1,1,1,3-tetrafluoropropane, and then dehydrofluorinating 1,1,1,3-tetrafluoropropane under conditions sufficient to produce 1,1,1,-trifluoropropene.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein each reaction is conducted in the presence of a catalyst which comprises palladium on carbon.
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) | 2002-11-15 | 2003-05-17 | 2003-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-11-15 | 2007-05-17 | 2007-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-11-15 | 2011-05-17 | 2011-11-16 | $7700.00 | Window Closed / Lapsed |