Patent US4258225A successfully refreshed from Google Patents.
US4258225A
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US
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TaF5 and NbF5 as fluorination catalysts
Assignee: EIDP Inc
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Filing: 1977-08-15
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Granted: 1981-03-24
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Expires: 1997-08-15
Abstract
Abstract A halogenated alkene is reacted with HF in the presence of TaF 5 or NbF 5 to produce a fluorinated alkane. Exemplary is the reaction of tetrachloroethene with HF in the presence of TaF 5 to produce 1,2,2-trichloro-1,1-difluoroethane and 1,1,2,2-tetrachloro-1-fluoroethane.
Inventors
- 👤 Andrew E. Feiring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:35
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/07; C07C17/087; C07C17/093; C07C17/20; C07C17/21
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
126 words
The process of contacting under substantially anhydrous conditions at a temperature range of 0° to 200° C. one mole of a halogenated olefin of the formula R.sub.1 R.sub.2 C═CR.sub.3 R.sub.4 wherein R 1 is H, F, Cl, CH 3 , CCl 3 or CF 3 ; R 2 is H, F or Cl; R 3 is H, F, or Cl; R 4 is F or Cl; in which at least two of the R groups are F or Cl; with 1 to 8 molar equivalents of HF and in the presence of 0.01 to 0.25 molar equivalents of TaF 5 or NbF 5 to produce a fluorinated alkane having one hydrogen atom over and above the number of hydrogen atoms originally present in the halogenated olefin.
Claim 2
Dependent Claim
126 words
The process of contacting under substantially anhydrous conditions at a temperature range of 0° to 200° C. one mole of a halogenated olefin of the formula R.sub.1 R.sub.2 C═CR.sub.3 R.sub.4 wherein R 1 is H, F, Cl, CH 3 , CCl 3 or CF 3 ; R 2 is H, F or Cl; R 3 is H, F, or Cl; R 4 is F or Cl; in which at least two of the R groups are F or Cl; with 1 to 8 molar equivalents of HF and in the presence of 0.01 to 0.25 molar equivalents of TaF 5 or NbF 5 to produce a fluorinated alkane having one hydrogen atom over and above the number of hydrogen atoms originally present in the halogenated olefin.
Claim 3
Dependent Claim
16 words
The process of claim 1 in which the amount of HF is 1.1 to 1.5 moles.
Claim 4
Dependent Claim
13 words
The process of claim 1 in which the catalyst is TaF 5 .
Claim 5
Dependent Claim
13 words
The process of claim 1 in which the catalyst in NbF 5 .
Claim 6
Dependent Claim
21 words
The process of claim 1 in which the catalyst is TaF 5 in an amount of 0.025 to 0.09 molar equivalents.
Claim 7
Dependent Claim
30 words
The process of claim 1 in which the temperature is 75° to 200° C. when R 1 , R 2 , R 3 and R 4 are F or Cl.
Claim 8
Dependent Claim
27 words
The process of claim 1 in which the temperature is 0° to 70° C. when one of R 1 , R 2 or R 3 is H.
Claim 9
Dependent Claim
12 words
The process of claim 1 in which the halogenated olefin is tetrachloroethene.
Claim 10
Dependent Claim
12 words
The process of claim 1 in which the halogenated olefin is trichloroethene.
Claim 11
Dependent Claim
19 words
The process of claim 1 in which the halogenated olefin is tetrachloroethene and the catalyst is TaF 5 .
Claim 12
Dependent Claim
19 words
The process of claim 1 in which the halogenated olefin is trichloroethene and the catalyst is TaF 5 .
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) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |