US3607955A
Expired / Lapsed
US
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Hydrofluorination and dehydrofluorination and catalysts therefor
Assignee: Phillips Petroleum Co
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Filing: 1968-04-08
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Granted: 1971-09-21
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Expires: 1988-04-08
Abstract
Abstract Hydrofluorination and dehydrofluorination reactions are accomplished over a catalyst bed formed by heating a bed of particles of porous alumina to a temperature of at least 220* F. and flowing therethrough a gaseous mixture of HF and an inert diluent until the hot zone of chemical reaction has passed completely through said bed.
Inventors
- 👤 Lioyd E Gardner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:14
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/07; C07C17/08; B; B01; B01J; B01J37/00; B01J37/22; B01J37/26; C07C17/25; C07C7/00; C07C7/148; C07C7/17
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
122 words
The process of dehydrofluorinating a gem-difluoro compound of the formula wherein each R'' is selected from the group consisting of hydrogen, alkyl and alkenyl radicals containing not more than 8 carbon atoms with the total number of carbon atoms in the molecule preferably not exceeding 10, which comprises passing a gaseous mixture of said difluoro compound through a bed of catalysts held at a temperature between 500* F. and 900* F., said catalyst having been prepared by heating a bed of porous alumina selected from eta-alumina, gamma-alumina and bauxite to a temperature of at least 220* F. and flowing therethrough a gaseous mixture of HF and an inert diluent until the hot zone of chemical reaction has passed completely through said bed.
Claim 2
Dependent Claim
127 words
The process of producing vinyl fluoride which comprises preparing a catalyst by heating a bed of porous alumina selected from eta-alumina, gamma-alumina and bauxite to a temperature of at least 220* F. and flowing therethrough a gaseous mixture of HF and nitrogen in approximately equal molar volumes at a flow rate of 50 to 500 volumes of gas per volume of catalyst per hour, maintaining the bed temperature below 650* F. and continuing the gas flow until the hot reaction zone has passed completely through the bed, and subsequently passing 1,1-difluoroethane through the catalyst so prepared at a flow rate of 50 to 200 volumes of gas per volume of catalyst per hour, while maintaining the catalyst bed at a temperature of 675* F. to 725* F.
Claim 3
Dependent Claim
157 words
The process of producing vinyl fluoride which comprises preparing a catalyst by heating a bed of porous alumina selected from eta-alumina, gamma-alumina and bauxite and a metal containing compound selected from the group composed of the fluorides of zinc, chromium, cobalt, silver, copper, vanadium, iron, nickel, and compounds of these metals convertible to fluorides, to a temperature of at least 220* F. and flowing therethrough a gaseous mixture of HF and nitrogen of approximately equal molar volumes at a flow rate of 50 to 500 volumes of gas per volume of catalyst per hour, maintaining the bed temperature below 650* F. and continuing the gas flow until the hot reaction zone has passed completely through the bed, and subsequently passing 1,1-difluoroethane through the catalyst so prepared at a flow rate of 50 to 200 volumes of gas per volume of catalyst per hour, while maintaining the catalyst bed at a temperature of 675* F. to 725* F.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |