US3862995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of 1,1-difluoroethane
Assignee: Solvay SA
•
Filing: 1972-04-18
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Granted: 1975-01-28
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Expires: 1992-04-18
Abstract
Abstract A method wherein vinyl chloride is reacted with hydrogen fluoride at temperatures between 100 and 400*C in the presence of a catalyst based on a vanadium derivative impregnated on activated carbon.
Inventors
- 👤 Guy Martens
- 👤 Marcel Godfroid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:27
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/06; B01J23/00; B01J23/16; B01J23/20; B01J23/22; B01J27/08; B01J27/10; B01J37/00; B01J37/22; B01J37/26; C; C07; C07C; C07C17/00; C07C17/093; C07C17/20; C07C17/21
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
15 words
A process according to claim 1, wherein the reaction temperature is between 150* and 300*C.
Claim 2
Dependent Claim
20 words
A process according to claim 1, wherein the activated carbon contains from 1 to 40 percent by weight of vanadium.
Claim 3
Dependent Claim
20 words
A process according to claim 3, wherein the activated carbon contains from 5 to 25 percent by weight of vanadium.
Claim 4
Dependent Claim
21 words
A process according to claim 3, wherein the vanadium derivative is an halide or oxyhalide of tri-, tetra- or pentavalent vanadium.
Claim 5
Dependent Claim
17 words
A process according to claim 1, wherein the catalyst is treated with hydrogen fluoride before the reacting.
Claim 6
Dependent Claim
36 words
A process as claimed in claim 3, wherein the vanadium derivative is trivalent vanadium and the activated carbon has a specific surface between 10 and 1,500m2 per g and pore diameters between 20 and 200 A.
Claim 7
Dependent Claim
45 words
A process as claimed in claim 7, wherein the catalyst is treated with HF before the reacting, and the molar ratio HF/CH2 CHCl during the reacting is from 3 to 4 with a contact time of at least 5 seconds at a temperature of 225*C.
Claim 8
Dependent Claim
26 words
A process as claimed in claim 8, wherein the activated carbon has a specific surface of 1,300 m2/g and an average pore diameter of 24 A.
Claim 9
Dependent Claim
86 words
A vapor-phase process according to claim 1 which comprises contacting a mixture of vinyl chloride and hydrogen fluoride with a catalytically-effective amount of the catalyst at a reaction temperature between 100* and 400*C; said catalyst consisting essentially of tri-, tetra- or pentavalent vanadium impregnated on activated carbon, and the vanadium being in the form of at least one member selected from the group consisting of vanadium oxide, vanadium hydroxide, vanadium halide, vanadium oxyhalide, vanadium sulphide, vanadium sulphate, vanadium nitrate, vanadium carbonate, vanadium phosphate and vanadium phosphite.
References Cited (Backward Citations)
US1996115A
Cited
US2005707A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |