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US4950364A
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Process for the separation of 1,1-dichloro-1-fluoroethane and 1,1,1,3,3-pentafluorobutane
Assignee: Arkema Inc
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Filing: 1989-05-04
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Granted: 1990-08-21
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Expires: 2009-05-04
Abstract
Abstract 1,1-Dichloro-1-fluroethane and 1,1,1,3,3-pentafluorobutane are separated from their liquid mixtures, such as liquid mixtures resulting from the hydrofluorination of 1,1,1-trichloroethane or vinylidene chloride. 1,1-Dichloro-1-fluoroethane and 1,1,1,3,3-pentafluorobutane are completely separated by distillation, by adding to the mixture thereof a liquid containing at least about 3 moles of hydrogen fluoride per mole of 1,1-dichloro-1-fluoroethane in the mixture subject to separation.
Inventors
- 👤 John A. Wismer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:31
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/38; C07C17/383; C07C17/386
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
57 words
A process for separating 1,1-dichloro-1fluoroethane from its liquid mixture with 1,1,1,3,3-pentafluorobutane, comprising: separating the liquid mixture by distillation to obtain a top product comprising hydrogen fluoride and 1,1-dichloro-1-fluoroethane, and a bottom product comprising 1,1,1,3,3-pentafluorobutane, by adding to the mixture a liquid containing at least about 3 moles of hydrogen fluoride per mole of 1,1-dichloro-1-fluoroethane in the mixture.
Claim 2
Dependent Claim
57 words
A process for separating 1,1-dichloro-1fluoroethane from its liquid mixture with 1,1,1,3,3-pentafluorobutane, comprising: separating the liquid mixture by distillation to obtain a top product comprising hydrogen fluoride and 1,1-dichloro-1-fluoroethane, and a bottom product comprising 1,1,1,3,3-pentafluorobutane, by adding to the mixture a liquid containing at least about 3 moles of hydrogen fluoride per mole of 1,1-dichloro-1-fluoroethane in the mixture.
Claim 3
Dependent Claim
28 words
A process according to claim 1 wherein the distillation is conducted in a distillation column having a temperature at the column top no higher than about 50° C.
Claim 4
Dependent Claim
24 words
A process according to claim 1 wherein the distillation top product has a composition similar to the azeotropic composition of 1,1-dichloro-1-fluoroethane and hydrogen fluoride.
Claim 5
Dependent Claim
49 words
A process according to claim wherein the distillation top product is condensed to form a liquid condensate, and the condensate is separated by phase separation into a liquid organic phase enriched in 1,1-dichloro-1-fluoroethane relative to hydrogen fluoride and a liquid inorganic phase enriched in hydrogen fluoride relative to 1,1-dichloro-1-fluoroethane.
Claim 6
Dependent Claim
24 words
A process according to claim 4 wherein the phase separation is conducted at a temperature of from about -25° C. to about -15° C.
Claim 7
Dependent Claim
26 words
A process according to claim 4 wherein the hydrogen fluoride-enriched inorganic liquid phase is combined with the liquid mixture of 1,1-dichloro-1-fluoroethane and 1,1,1,3,3-pentafluorobutane subject to distillation.
Claim 8
Dependent Claim
34 words
A process according to claim 4 wherein the hydrogen fluoride-enriched inorganic liquid phase is recycled to the feed of a reactor for the production of 1,1-dichloro-1-fluoroethane from the reaction of hydrogen fluoride and 1,1,1-trichloroethane.
Claim 9
Dependent Claim
39 words
A process according to claim 4 further comprising separating the 1,1-dichloro-1-fluoroethane-enriched liquid organic phase by a second distillation to obtain a mixture of 1,1-dichloro-1-fluoroethane and hydrogen fluoride as a distillation top product, and 1,1-dichloro-1-fluoroethane as a distillation bottom product.
Claim 10
Dependent Claim
29 words
A process according to claim 8 wherein the second distillation is conducted in a distillation column having a temperature at the column top no higher than about 50° C.
Claim 11
Dependent Claim
25 words
A process according to claim 8 wherein the second distillation top product has a composition similar to the azeotropic composition of hydrogen fluoride and 1,1-dichloro-1-fluoroethane.
Claim 12
Dependent Claim
29 words
A process according to claim 8 wherein the second distillation top product is combined with the top product from the distillation of the liquid mixture of 1,1-dichloro-1-fluoroethane and 1,1,1,3,3-pentafluorobutane.
Claim 13
Dependent Claim
33 words
A process according to claim 1 wherein the liquid added to the mixture of 1,1-dichloro-1-fluoroethane and 1,1,1,3,3-pentafluorobutane subject to separation is a reaction product originating from the hydrofluorination of 1,1,1-trichloroethane or vinylidene chloride.
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) | 1993-08-20 | 1994-02-19 | 1994-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-20 | 1998-02-19 | 1998-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-20 | 2002-02-19 | 2002-08-21 | $7700.00 | Window Closed / Lapsed |