US4922037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-phase fluorination process
Assignee: EIDP Inc
•
Filing: 1989-05-19
•
Granted: 1990-05-01
•
Expires: 2009-05-19
Abstract
Abstract An improved process for the manufacture of 1,1,1,2-tetrafluoroethane, more particularly, a gas-phase reaction of a 1,1,1-trifluorochloroethane with hydrogen fluoride in the presence of a selected metal on aluminum fluoride or carbon.
Inventors
- 👤 Leo E. Manzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:58
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/093; C07C17/20; C07C17/202; C07C17/206
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
114 words
A process for the preparation of 1,1,1,2-tetrafluoroethane by fluorination of 1,1,1-trifluorochloroethane, which process comprises contacting in the gaseous phase at about 300° C. to about 500° C. said 1,1,1-trifluorochloroethane with HF and a catalyst comprising at least one metal, said metal selected from a group consisting of a metal from Groups VIII, VIIB, IIIB, IB and/or a metal having an atomic number of 58 through 71, said metal on aluminum fluoride or carbon, said metal having an oxidation state greater than zero, said HF and 1,1,1-trifluorochloroethane present in a mole ratio of about 3/1 to about 30/1, said contacting producing a product stream containing 1,1,1,2-tetrafluoroethane and, thereafter, separating the 1,1,1,2-tetrafluoroethane from the product stream.
Claim 2
Dependent Claim
114 words
A process for the preparation of 1,1,1,2-tetrafluoroethane by fluorination of 1,1,1-trifluorochloroethane, which process comprises contacting in the gaseous phase at about 300° C. to about 500° C. said 1,1,1-trifluorochloroethane with HF and a catalyst comprising at least one metal, said metal selected from a group consisting of a metal from Groups VIII, VIIB, IIIB, IB and/or a metal having an atomic number of 58 through 71, said metal on aluminum fluoride or carbon, said metal having an oxidation state greater than zero, said HF and 1,1,1-trifluorochloroethane present in a mole ratio of about 3/1 to about 30/1, said contacting producing a product stream containing 1,1,1,2-tetrafluoroethane and, thereafter, separating the 1,1,1,2-tetrafluoroethane from the product stream.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the amount of metal is about 0.02 to about 50 weight percent of the catalyst.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein the amount of metal is about 0.1 to about 10 weight percent of the catalyst.
Claim 5
Dependent Claim
35 words
The process of claim 1 wherein the HF is contacted with the 1,1,1-trifluorochloroethane at a temperature of about 300° C. to about 475° C. and a contact time of about 0.1 to about 60 seconds.
Claim 6
Dependent Claim
45 words
The process of claim 4 wherein the HF is contacted with the 1,1,1-trifluorochloroethane at a mol ratio of about 3/1 to about 20/1, at a temperature of about 350° C. to about 475° C., and a contact time of about 10 to about 30 seconds.
Claim 7
Dependent Claim
45 words
The process of claim 1 wherein the HF is contacted with the 1,1,1-trifluorochloroethane at a mol ratio of about 5/1 to about 10/1, at a temperature of about 400° C. to about 450° C., and a contact time of about 10 to about 30 seconds.
Claim 8
Dependent Claim
21 words
The process of claim 1 wherein the metal is selected from the group consisting of cobalt, lanthanum, nickel, manganese and ruthenium.
Claim 9
Dependent Claim
10 words
The process of claim 7 wherein the metal is cobalt.
Claim 10
Dependent Claim
10 words
The process of claim 7 wherein the metal is ruthenium.
Claim 11
Dependent Claim
10 words
The process of claim 7 wherein the metal is nickel.
Claim 12
Dependent Claim
10 words
The process of claim 7 wherein the metal is lanthanum.
Claim 13
Dependent Claim
10 words
The process of claim 7 wherein the metal is manganese.
Claim 14
Dependent Claim
22 words
The process of claim 1 wherein the metal is supported on carbon and the product stream contains substantially no CF 2 ═CHCl.
References Cited (Backward Citations)
US2005707A
Cited
US2744148A
Cited
US2744147A
Cited
US3650987A
Cited
US3787331A
Cited
US3793229A
Cited
US4158675A
Cited
US4129603A
Cited
JPS5527138A
Cited
GB2030981A
Cited
JPS608234A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |