US3660254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of products from electrochemical fluorination
Assignee: Phillips Petroleum Co
•
Filing: 1970-06-08
•
Granted: 1972-05-02
•
Expires: 1990-06-08
Abstract
Abstract Fluorinated products are recovered from an effluent stream from an electrolytic cell in an electrochemical fluorination process by employing a combination of steps comprising cooling said effluent stream to a temperature near its dew point but insufficient to cause any significant condensation thereof, compressing said cooled effluent stream, chilling said compressed effluent stream to a temperature sufficient to condense at least the major portion of the components thereof other than hydrogen, and recovering fluorinated products from said chilled stream. In a preferred embodiment the initial cooling of said effluent stream is effected by directly contacting same with a liquid stream comprising the feedstock to the electrolytic cell.
Inventors
- 👤 Robert O Dunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:03
CPC Classifications
C; C25; C25B; C25B3/00; C25B3/20; C25B3/27; C25B3/28; C25B3/01; C25B3/11
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
26 words
A process according to claim 1 wherein said effluent stream is cooled in step (a) by directly contacting same with a liquid stream comprising said feedstock.
Claim 2
Dependent Claim
21 words
A process according to claim 2 wherein said effluent stream is cooled to a temperature not greater than about 165* F.
Claim 3
Dependent Claim
29 words
A process according to claim 2 wherein said compressed stream is chilled in step (c) to a temperature sufficient to condense hydrogen fluoride and higher boiling materials contained therein.
Claim 4
Dependent Claim
84 words
A process according to claim 4 wherein: e. said chilled effluent stream from step (c) is passed to a first phase separation zone; f. a liquid stream comprising hydrogen fluoride is withdrawn from said first phase separation zone for recycle to said cell; g. a gaseous stream comprising hydrogen is vented from said first phase separation zone; and h. said fluorinated products recovered in step (d) are recovered from a second liquid stream comprising same which is withdrawn from said first phase separation zone.
Claim 5
Dependent Claim
63 words
A process according to claim 5 wherein: i. said stream comprising hydrogen in step (g) is compressed, then chilled, and then passed to a second phase separation zone; j. a stream comprising hydrogen is vented from said second phase separation zone; and k. a stream comprising liquid hydrogen fluoride is returned from said second phase separation zone to said first phase separation zone.
Claim 6
Dependent Claim
42 words
A process according to claim 5 wherein: said second liquid stream of step (h) is passed to a stripper zone; hydrogen fluoride vapors are stripped from said second liquid stream; and said fluorinated products are recovered from said stripped second liquid stream.
Claim 7
Dependent Claim
56 words
A process according to claim 6 wherein: l. said second liquid stream from step (h) is passed to a stripper zone; m. hydrogen fluoride vapors are stripped from said second liquid stream and returned to said compressed cooled effluent stream of step (b); and n. said fluorinated products are recovered from said stripped second liquid stream.
Claim 8
Dependent Claim
31 words
A process according to claim 2 wherein: said feedstock to said cell comprises 1,2-dichloroethane; and said fluorinated products recovered in step (d) include at least one of 1,1,2-trichloro-1,2,2-trifluoroethane; 1,2-dichlorotetrafluoroethane; and monochloropentafluoroethane.
Claim 9
Dependent Claim
33 words
A process according to claim 7 wherein: said feedstock to said cell comprises 1,2-dichloroethane; and said fluorinated products recovered from said stripped second liquid include at least one of 1,1,2-trichloro-1,2,2-trifluoroethane; 1,2-dichlorotetrafluoroethane; and monochloropentafluoroethane.
Claim 10
Dependent Claim
31 words
A process according to claim 8 wherein: said feedstock to said cell comprises 1,2-dichloroethane; and said fluorinated products recovered in step (n) include at least one of 1,1,2-trichloro-1,2,2-trifluoroethane; 1,2-dichlorotetrafluoroethane; and monochloropentafluoroethane.
Claim 11
Dependent Claim
97 words
A process according to claim 7 wherein: said feedstock to said cell comprises 1,2-dichLoroethane; said stripped second liquid stream is passed to a first distillation zone comprising a first fractionation column and a second fractionation column; an overhead stream comprising monochloropentafluoroethane is passed from said first fractionation column to said second fractionation column; an overhead stream comprising said monochloropentafluoroethane is removed overhead from said second fractionation column as a product of the process; and a bottoms stream comprising 1-chloro-1,1,2,2-tetrafluoroethane is recovered from said second fractionation column and recycled to said cell as a portion of said feedstock.
Claim 12
Dependent Claim
105 words
A process according to claim 12 wherein: a bottoms stream comprising other fluorinated materials and unreacted 1,2-dichloroethane is passed from said first fractionation column to a second distillation zone comprising a third fractionation column and a fourth fractionation column; an overhead stream comprising 1,2-dichlorotetrafluoroethane is recovered from said third fractionation column as another product of the process; a bottoms stream comprising said other fluorinated materials and said unreacted 1,2-dichloroethane is passed from said third fractionation column to said fourth fractionation column; and an overhead stream comprising 1,2-dichloro-1,2,2-trifluoroethane is recovered from said fourth fractionation column and recycled to said cell as a portion of said feedstock.
Claim 13
Dependent Claim
111 words
A process according to claim 13 wherein: a bottoms stream comprising said other fluorinated materials and said unreacted 1,2-dichloroethane is passed from said fourth fractionation column to a third distillation zone comprising a fifth fractionation column and a sixth fractionation column; an overhead stream comprising 1,1,2-trichloro-1,2,2-trifluoroethane is recovered from said fifth fractionation column as another product of the process; a bottoms stream comprising said other fluorinated materials and said unreacted 1,2-dichloroethane is passed from said fifth fractionation column to said sixth fractionation column; and an overhead stream comprising 1,2-dichloro-1-monofluoroethane and said unreacted 1,2-dichloroethane is recovered from said sixth fractionation column and recycled to said cell as a portion of said feedstock.
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |