US4754085A
Expired / Lapsed
US
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Process for the preparation of hydrofluoroalkanes
Assignee: Syensqo Specialty Polymers Italy SpA
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Filing: 1986-10-20
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Granted: 1988-06-28
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Expires: 2006-10-20
Abstract
Abstract Process for the preparation of hydro(halo)fluoroalkanes by direct fluorination in liquid phase with elemental fluorine at low temperature (under 0° C.) of the corresponding hydro(halo)=alkenes.
Inventors
- 👤 Claudio Gervasutti
- 👤 Lino Conte
- 👤 Gian Paolo Gambaretto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:46
CPC Classifications
C; C07; C07C; C07C41/00; C07C41/01; C07C41/18; C07C41/22; C07C17/00; C07C17/013; C07C17/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
103 words
A process for preparing a hydrofluoroalkane or a hydrohalofluoralkane of the formula: ##STR2## starting from a hydroalkene or a hydrohaloalkene of the formula: ##STR3## wherein: X=H, F, Cl or Br; and R 1 , R 2 =H, F, Cl, Br, C 1 -C 3 -alkyl or C 1 -C 3 -alkoxy in which the H atoms may also be completely substituted by Cl or F, characterized in that hydroalkene or hydrohaloalkene is reacted in the liquid phase with elemental fluorine diluted with an inert gas at a temperature between -70° and -100° C., the molar ratio inert gas/fluorine being between 5 and 15.
Claim 2
Dependent Claim
103 words
A process for preparing a hydrofluoroalkane or a hydrohalofluoralkane of the formula: ##STR2## starting from a hydroalkene or a hydrohaloalkene of the formula: ##STR3## wherein: X=H, F, Cl or Br; and R 1 , R 2 =H, F, Cl, Br, C 1 -C 3 -alkyl or C 1 -C 3 -alkoxy in which the H atoms may also be completely substituted by Cl or F, characterized in that hydroalkene or hydrohaloalkene is reacted in the liquid phase with elemental fluorine diluted with an inert gas at a temperature between -70° and -100° C., the molar ratio inert gas/fluorine being between 5 and 15.
Claim 3
Dependent Claim
19 words
Process according to claim 1, wherein the temperature is within the range of from -70° C. to -85° C.
Claim 4
Dependent Claim
31 words
Process according to claim 1, wherein the liquid reaction phase is constituted by the reactant and by the reaction products, in the form of a mixture with a perhalogenated inert solvent.
Claim 5
Dependent Claim
29 words
Process according to claim 3, wherein the amount of solvent used is within the range of from 1 to 20 parts by weight per each part of reactant compound.
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) | 1991-06-28 | 1991-12-28 | 1992-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-28 | 1995-12-28 | 1996-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-28 | 1999-12-28 | 2000-06-28 | $7700.00 | Window Closed / Lapsed |