US3859424A
Expired / Lapsed
US
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Process and catalyst for fluorinating aliphatic compounds
Assignee: Hoechst AG
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Filing: 1971-02-19
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Granted: 1975-01-07
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Expires: 1991-02-19
Abstract
Abstract A novel fluorination catalyst and its preparation, by reacting a hydrated oxide of trivalent chromium with hydrogen fluoride, is described as having utility in fluorinating halogenated aliphatic hydrocarbon.
Inventors
- 👤 Otto Scherer
- 👤 Jurgen Korinth
- 👤 Peter Frisch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:53
CPC Classifications
C; C07; C07C; C07C17/00; B; B01; B01J; B01J27/00; B01J27/06; C07B; C07B39/00; C07C17/093; C07C17/20; C07C17/202; C07C17/206; C07C17/21; C07C45/00; C07C45/61; C07C45/63
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
96 words
A PROCESS FOR PREPARING A FLUORINATION CATALYST CONSISTING ESSENTIALLY OF CHROMIUM AND FLUORINE AND OXYGEN IN COMBINATION THEREWITH, THE EMPIRICAL COMPOSITION OF WHICH VARIES BETWEEN CRF2O AND CRFO2 WHEN THE MOLAR AMOUNT OF CHROMIUM IS TAKEN AS ONE, WHICH COMPRISES PASSING OVER A HYDRATED OXIDE OF TRIVALENT CHROMIUM OF THE GENERAL FORMULA CR2O3 .XH2O, WHEREIN X IS FROM 1 TO 9, 3 TO 8 MOLES OF HYDROGEN FLUORIDE PER MOLE OF SAID HYDRATED OXIDE OF TRIVALENT CHROMIUM AT A TEMPERATURE IN THE RANGE FROM 150* TO 600*C AND FOR A TIME FROM 2 TO 100 HOURS.
Claim 2
Dependent Claim
96 words
A PROCESS FOR PREPARING A FLUORINATION CATALYST CONSISTING ESSENTIALLY OF CHROMIUM AND FLUORINE AND OXYGEN IN COMBINATION THEREWITH, THE EMPIRICAL COMPOSITION OF WHICH VARIES BETWEEN CRF2O AND CRFO2 WHEN THE MOLAR AMOUNT OF CHROMIUM IS TAKEN AS ONE, WHICH COMPRISES PASSING OVER A HYDRATED OXIDE OF TRIVALENT CHROMIUM OF THE GENERAL FORMULA CR2O3 .XH2O, WHEREIN X IS FROM 1 TO 9, 3 TO 8 MOLES OF HYDROGEN FLUORIDE PER MOLE OF SAID HYDRATED OXIDE OF TRIVALENT CHROMIUM AT A TEMPERATURE IN THE RANGE FROM 150* TO 600*C AND FOR A TIME FROM 2 TO 100 HOURS.
Claim 3
Dependent Claim
30 words
A process as defined in claim 1, which comprises passing over said hydrated oxide of trivalent chromium said hydrogen fluoride at a temperature in the range from 350* to 450*C.
Claim 4
Dependent Claim
18 words
A process as defined in claim 1, wherein the hydrogen fluoride has been diluted with an inert gas.
Claim 5
Dependent Claim
94 words
A process for preparing a fluorination catalyst consisting essentially of chromium and fluorine and oxygen in combination therewith, the empirical composition of which varies between CrF1.5O1.5 and CrF2O when the molar amount of chromium is taken as one, which comprises passing at about atmospheric pressure at a temperature in the range from 200* to 600*C, over chromic hydroxide of the general formula Cr2O3 .3H2O, 3 to 8 moles of hydrogen fluoride per mole of said chromic hydroxide, said hydrogen fluoride being diluted with an inert gas, for a time from 2 to 100 hours.
Claim 6
Dependent Claim
94 words
A process for preparing a fluorination catalyst consisting essentially of chromium and fluorine and oxygen in combination therewith, the empirical composition of which varies between CrF1.5O1.5 and CrF2O when the molar amount of chromium is taken as one, which comprises passing at about atmospheric pressure at a temperature in the range from 200* to 600*C, over chromic hydroxide of the general formula Cr2O3 .3H2O, 3 to 8 moles of hydrogen fluoride per mole of said chromic hydroxide, said hydrogen fluoride being diluted with an inert gas, for a time from 2 to 100 hours.
Claim 7
Dependent Claim
94 words
A process for preparing a fluorination catalyst consisting essentially of chromium and fluorine and oxygen in combination therewith, the empirical composition of which varies between CrF1.5O1.5 and CrFO2 when the molar amount of chromium is taken as one, which comprises passing at about atmospheric pressure at a temperature in the range from 200* to 600*C, over ''''Guignet''s green'''' of the general formula Cr2O3 .2H2O, 3 to 8 moles of hydrogen fluoride per mole of said ''''Guignet''s green,'''' said hydrogen fluoride being diluted with an inert gas, for a time from 2 to 100 hours.
Claim 8
Dependent Claim
94 words
A process for preparing a fluorination catalyst consisting essentially of chromium and fluorine and oxygen in combination therewith, the empirical composition of which varies between CrF1.5O1.5 and CrFO2 when the molar amount of chromium is taken as one, which comprises passing at about atmospheric pressure at a temperature in the range from 200* to 600*C, over ''''Guignet''s green'''' of the general formula Cr2O3 .2H2O, 3 to 8 moles of hydrogen fluoride per mole of said ''''Guignet''s green,'''' said hydrogen fluoride being diluted with an inert gas, for a time from 2 to 100 hours.
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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |