US4118290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of perfluoroethyl iodide
Assignee: Hoechst AG
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Filing: 1977-03-09
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Granted: 1978-10-03
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Expires: 1997-03-09
Abstract
Abstract Perfluoroethyl iodide is prepared from an agitated mixture of tetrafluoro-diiodoethane and hydrogen fluoride by means of electrolysis. Preferably the temperature is in the range of from -15° C to +19° C and the voltage in the range of from 4 to 6 V.
Inventors
- 👤 Hans-Joachim Semmler
- 👤 Bernd Felix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:55
CPC Classifications
C; C25; C25B; C25B3/00; C25B3/20; C25B3/27; C25B3/28; C25B3/01; C25B3/11
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
51 words
Process for the preparation of perfluoroethyl iodide from tetrafluoro-diiodoethane and hydrogen fluoride, which comprises electrolyzing a mixture of anhydrous hydrofluoric acid and tetrafluoro-diiodoethane at a temperature of from -15° C to +19° C at a voltage of from 3 to 8.5 using a nickel anode and recovering the formed perfluoroethyl iodide.
Claim 2
Dependent Claim
51 words
Process for the preparation of perfluoroethyl iodide from tetrafluoro-diiodoethane and hydrogen fluoride, which comprises electrolyzing a mixture of anhydrous hydrofluoric acid and tetrafluoro-diiodoethane at a temperature of from -15° C to +19° C at a voltage of from 3 to 8.5 using a nickel anode and recovering the formed perfluoroethyl iodide.
Claim 3
Dependent Claim
22 words
A process as claimed in claim 1, which comprises working at a voltage in the range of from 4 to 6 V.
Claim 4
Dependent Claim
18 words
A process as claimed in claim 1, which comprises stirring the mixture of hydrogen fluoride and tetrafluoro-diiodoethane thoroughly.
Claim 5
Dependent Claim
17 words
A process as claimed in claim 1, which comprisescontinuously filtering from the electrolyte the iodine being formed.
Claim 6
Dependent Claim
36 words
A process as claimed in claim 1, which comprises working at a temperature in the range of from +10 to +19° C and eliminating the perfluoroethyl iodide being formed in the reaction in the gaseous state.
Claim 7
Dependent Claim
26 words
A process as claimed in claim 1, wherein the mixture of anhydrous hydrofluoric acid and tetrafluoro-diiodoethane contains from 2 to 25 % by weight of tetrafluoro-diiodoethane.
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) | 1981-10-02 | 1982-04-03 | 1982-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-02 | 1986-04-03 | 1986-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-02 | 1990-04-03 | 1990-10-03 | $7700.00 | Window Closed / Lapsed |