US3645863A
Expired / Lapsed
US
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Electrochemical fluorination
Assignee: Phillips Petroleum Co
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Filing: 1969-10-20
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Granted: 1972-02-29
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Expires: 1989-10-20
Abstract
Abstract In an electrochemical fluorination process, the residence time or contact time of the feedstock with the fluorinating species within the pores of a porous anode is regulated so as to reduce or eliminate the formation of undesired by-products and increase the production of the desired final product.
Inventors
- 👤 William S Stewart
- 👤 John W Vanderveen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:55
CPC Classifications
C; C25; C25B; C25B3/00; C25B3/20; C25B3/27; C25B3/28; C25B3/01; C25B3/11
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
32 words
A process according to claim 1 wherein: said porous anode comprises porous carbon; said feedstock is 1,2-dichloroethane; said desired fluorinated intermediate product is 1,2-dichlorofluoroethane; and said desired fluorinated final product is 1,2-dichlorotetrafluoroethane.
Claim 2
Dependent Claim
21 words
A process according to claim 1 wherein said residence time in said first-mentioned anode is not more than about 2.5 seconds.
Claim 3
Dependent Claim
21 words
A process according to claim 1 wherein said residence time in said first-mentioned anode is not more than about 5 seconds.
Claim 4
Dependent Claim
21 words
A process according to claim 1 wherein said residence time in said first-mentioned anode is not more than about 10 seconds.
Claim 5
Dependent Claim
23 words
A process according to claim 1 wherein said unfluorinated feedstock is recycled from said separation zone into the pores of said porous anode.
Claim 6
Dependent Claim
33 words
A process according to claim 6 wherein: said porous anode comprises porous carbon; said feedstock is 1,2-dichloroethane; said fluorinated product is 1,2-dichlorofluoroethane; and said residence time is not more than about 2.5 seconds.
Claim 7
Dependent Claim
85 words
A process according to claim 1 wherein: a second effluent stream comprising said desireD fluorinated final product, unreacted desired fluorinated intermediate product, and other intermediate fluorinated products is passed from within the pores of said second anode to a second separation zone; said desired fluorinated final product is recovered from said second separation zone; and another stream comprising said unreacted desired fluorinated intermediate product and said other intermediate fluorinated products is recycled from said second separation zone into the pores of said second porous anode.
Claim 8
Dependent Claim
57 words
A process according to claim 8 wherein: said porous anode comprises porous carbon; said feedstock is 1,2-dichloroethane; said desired fluorinated intermediate product is 1,2-dichlorofluoroethane; said desired fluorinated final product is 1,2-dichlorotetrafluoroethane; said other intermediate fluorinated products comprise 1,2-dichloro-1,2difluoroethane, 1, 2-dichloro-1,1-difluoroethane, and 1,2-dichloro-1,2,2-trifluoroethane; and said residence time in said first-mentioned anode is not more than about 2.5 seconds.
References Cited (Backward Citations)
US3511760A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |