US5347059A
Expired / Lapsed
US
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Process for preparing 1,1-dichloro-1,3,3,3-tetra-fluoropropane
Assignee: Solvay SA
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Filing: 1994-01-18
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Granted: 1994-09-13
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Expires: 2014-01-18
Abstract
Abstract The invention relates to a process for preparing 1,1-dichloro-1,3,3,3-tetrafluoropropane by reacting, in the liquid phase, 1,1,1,3,3,3-hexachloropropane with hydrogen fluoride, in the presence of a catalyst.
Inventors
- 👤 Pascal Pennetreau
- 👤 Francine Janssens
- 👤 Pierre Barthelemy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:44
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/093; C07C17/20; C07C17/202; C07C17/206
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
67 words
A process for preparing 1,1-dichloro-1,3,3,3-tetrafluoropropane, comprising: reacting 1,1,1,3,3,3-hexachloropropane in the liquid phase with hydrogen fluoride, in a mole ratio of hydrogen fluoride to 1,1,1,3,3,3-hexachloropropane of at least 4 and not exceed more than 20, at a reaction temperature of at least about 100° C. and not more than about 150° C., and in the presence of a tin tetrachloride catalyst to produce 1,1-dichloro-1,3,3,3-tetrafluoropropane; and recovering said 1,1-dichloro-1,3,3,3-tetrafluoropropane.
Claim 2
Dependent Claim
67 words
A process for preparing 1,1-dichloro-1,3,3,3-tetrafluoropropane, comprising: reacting 1,1,1,3,3,3-hexachloropropane in the liquid phase with hydrogen fluoride, in a mole ratio of hydrogen fluoride to 1,1,1,3,3,3-hexachloropropane of at least 4 and not exceed more than 20, at a reaction temperature of at least about 100° C. and not more than about 150° C., and in the presence of a tin tetrachloride catalyst to produce 1,1-dichloro-1,3,3,3-tetrafluoropropane; and recovering said 1,1-dichloro-1,3,3,3-tetrafluoropropane.
Claim 3
Dependent Claim
27 words
The process according to claim 1, wherein the tin tetrachloride catalyst is used in a ratio of 0.005 to 0.1 mol of catalyst per mol of 1,1,1,3,3,3-hexachloropropane.
Claim 4
Dependent Claim
26 words
The process according to claim 1, wherein the mole ratio of hydrogen fluoride to the 1,1,1,3,3,3-hexachloropropane used is at least 6 and does not exceed 17.
Claim 5
Dependent Claim
26 words
The process according to claim 1, wherein the reaction is carried out at a pressure of at least 2 bar and not more than 50 bar.
Claim 6
Dependent Claim
21 words
The process according to claim 4, wherein the pressure at which the reaction is carried out is at least 10 bar.
Claim 7
Dependent Claim
26 words
The process according to claim 1, wherein the catalyst is used in a ratio of about 0.02 to 0.06 mol of catalyst per mol of 1,1,1,3,3,3-hexachloropropane.
Claim 8
Dependent Claim
25 words
The process according to claim 1, wherein a mole ratio of hydrogen fluoride to 1,1,1,3,3,3-hexachloropropane used is at least 8 and does not exceed 17.
Claim 9
Dependent Claim
26 words
The process according to claim 1, wherein the reaction is carried out at a pressure of at least 20 bar and not more than 30 bar.
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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) | 1997-09-12 | 1998-03-14 | 1998-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-12 | 2002-03-14 | 2002-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-12 | 2006-03-14 | 2006-09-13 | $7700.00 | Window Closed / Lapsed |