US4851595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid phase halogen exchange process for the manufacture of 1,1,1,2-tetrafluoroethane
Assignee: EIDP Inc
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Filing: 1988-11-03
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Granted: 1989-07-25
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Expires: 2008-11-03
Abstract
Abstract A process is disclosed for the manufacture of 1,1,1,2-tetrafluoroethane, FC-134a, more particularly for its manufacture from 1,1,1-trifluoro-2-chloroethane, FC-133a, by reaction with a high fluoride content antimony pentahalide.
Inventors
- 👤 William H. Gumprecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:05
CPC Classifications
C; C07; C07C; C07C19/00; C07C19/08; C07C17/00; C07C17/093; C07C17/20; C07C17/202; C07C17/208
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
127 words
A process for preparing CF 3 CH 2 F which comprises contacting CF 3 CH 2 Cl with a liquid SbF 5-x Cl x composition, where x=0 to 2, at an effective temperature in the range of about 40° C. to about 175° C. to form a reaction mixture, said liquid SbF 5-x Cl x composition present for contacting with the CF 3 CH 2 Cl in a stoichiometric quantity sufficient to provide at least one F for every Cl of said CF 3 CH 2 Cl to be replaced; maintaining said contacting and temperature until at least a portion of the CF 3 CH 2 Cl has been converted to CF 3 CH 2 F; and recovering CF 3 CH 2 F from the reaction mixture.
Claim 2
Dependent Claim
127 words
A process for preparing CF 3 CH 2 F which comprises contacting CF 3 CH 2 Cl with a liquid SbF 5-x Cl x composition, where x=0 to 2, at an effective temperature in the range of about 40° C. to about 175° C. to form a reaction mixture, said liquid SbF 5-x Cl x composition present for contacting with the CF 3 CH 2 Cl in a stoichiometric quantity sufficient to provide at least one F for every Cl of said CF 3 CH 2 Cl to be replaced; maintaining said contacting and temperature until at least a portion of the CF 3 CH 2 Cl has been converted to CF 3 CH 2 F; and recovering CF 3 CH 2 F from the reaction mixture.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the liquid SbF 5-x Cl x is characterized by x=less than 1.
Claim 4
Dependent Claim
16 words
The process of claim 2 wherein the liquid SbF 5-x Cl x is characterized by x=0.
Claim 5
Dependent Claim
18 words
The process of claim 1 wherein the liquid SbF 5-x Cl x is characterized by X=1 to 2.
Claim 6
Dependent Claim
34 words
The process of claim 4 wherein the liquid SbF 5-x Cl x is characterized by x=a fractional number between 1 and 2, including mixtures of SbF 4 Cl and SbF 3 Cl 2 .
Claim 7
Dependent Claim
16 words
The process of claim 1 wherein the temperature is about 60° C. to about 125° C.
Claim 8
Dependent Claim
16 words
The process of claim 1 wherein the temperature is about 70° C. to about 100° C.
Claim 9
Dependent Claim
28 words
The process of claim 1 wherein the contacting and maintaining steps occur in the presence of less than a molar proportion of HF based on the Sb compound.
Claim 10
Dependent Claim
20 words
The process of claim 1 wherein the contacting and maintaining steps occur in the in the substantial absence of HF.
Claim 11
Dependent Claim
42 words
The process of claim 1 further including the step of forming CF 3 CH 2 Cl in situ from a suitable underfluorinated precursor, C 2 H 2 Y 4 , where Y=Cl or F, with at least two of Y being Cl.
Claim 12
Dependent Claim
53 words
The process of claim 10 wherein the underfluorinated precursor is selected from the group consisting of 1,1,1,2-tetrachlorethane (CCl 2 CH 2 Cl), 1,1,2,2-tetrachloroethane (CHCl 2 CHCL 2 ), 1-fluoro-1,1,2-trichloroethane (CFCl 2 CH 2 Cl), 1-fluoro-1,2,2-trichloroethane (CHFClCHCl 2 ), 1,1-difluoro-2,2-dichloroethane (CHF 2 CHCl 2 ), 1,1-difluoro-1,2-dichloroethane (CF 2 ClCH 2 Cl), and mixtures thereof.
References Cited (Backward Citations)
CA705927A
Cited
US1978840A
Cited
US2230925A
Cited
US2569644A
Cited
US2431969A
Cited
US2549988A
Cited
GB589167A
Cited
US3240826A
Cited
US3201483A
Cited
US3287424A
Cited
US3644545A
Cited
GB1585938A
Cited
US4129603A
Cited
US4311863A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-24 | 1993-01-23 | 1993-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-24 | 1997-01-23 | 1997-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-24 | 2001-01-23 | 2001-07-25 | $7700.00 | Window Closed / Lapsed |