US4766260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-phase fluorination process
Assignee: EIDP Inc
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Filing: 1987-07-07
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Granted: 1988-08-23
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Expires: 2007-07-07
Abstract
Abstract An improved gas-phase process for the manufacture of 1,1,1-trifluorodichloroethane and 1,1,1,2-tetrafluorochloroethane by contacting a suitable tetrahaloethylene with hydrogen fluoride in the presence of a selected metal on a high fluorine content alumina support, the reaction being conducted under controlled conditions whereby the production of pentafluoroethane is minimized.
Inventors
- 👤 Leo E. Manzer
- 👤 V. N. Mallikarjuna Rao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:32
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/093; C07C17/20; C07C17/07; C07C17/087; C07C17/21
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
120 words
A process for the preparation of 1,1,1-trifluorodichloroethane and 1,1,1,2-tetrafluorochloroethane by fluorination of a tetrahaloethylene, C 2 Cl 4-x F x , wherein x=0 to 3, comprising contacting in the gaseous phase at about 300° C. to about 450° C. said tetrahaloethylene and HF with a catalyst comprising at least one metal in an oxidation state greater than zero, said metal selected from the group consisting of chromium, manganese, nickel, and cobalt, on a support consisting essentially of aluminum, oxygen, and fluorine in such proportions that the fluorine content corresponds to an AlF 3 content of at least 90% by weight of the catalyst composition exclusive of said metal, said AlF 3 content being obtained by pretreatment of alumina with HF.
Claim 2
Dependent Claim
120 words
A process for the preparation of 1,1,1-trifluorodichloroethane and 1,1,1,2-tetrafluorochloroethane by fluorination of a tetrahaloethylene, C 2 Cl 4-x F x , wherein x=0 to 3, comprising contacting in the gaseous phase at about 300° C. to about 450° C. said tetrahaloethylene and HF with a catalyst comprising at least one metal in an oxidation state greater than zero, said metal selected from the group consisting of chromium, manganese, nickel, and cobalt, on a support consisting essentially of aluminum, oxygen, and fluorine in such proportions that the fluorine content corresponds to an AlF 3 content of at least 90% by weight of the catalyst composition exclusive of said metal, said AlF 3 content being obtained by pretreatment of alumina with HF.
Claim 3
Dependent Claim
10 words
The process of claim 1 wherein the tetrahaloethylene is tetrachloroethylene.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein the catalyst contains about 0.02 to about 20 weight percent of said metal expressed as the divalent oxide.
Claim 5
Dependent Claim
24 words
The process of claim 1 wherein the catalyst contains about 0.1 to about 5 weight percent of metal said expressed as the divalent oxide.
Claim 6
Dependent Claim
49 words
The process as in claims 1, 2, or 3 wherein the HF is contacted with the tetrahaloethylene at a mol ratio of about 1/1 to about 20/1, at a temperature of about 300° C. to about 400° C., and a contact time of about 5 to about 100 seconds.
Claim 7
Dependent Claim
19 words
The process of claim 1 wherein said metal is selected from the group consisting of manganese, nickel, and cobalt.
Claim 8
Dependent Claim
10 words
The process of claim 4 wherein said metal is cobalt.
Claim 9
Dependent Claim
33 words
The process of claim 1 further comprising the step of recycling at least a portion of the CF 3 CHCl 2 produced to the contacting step for conversion to additional CF 3 CHClF.
References Cited (Backward Citations)
US2669590A
Cited
US2744147A
Cited
US2744148A
Cited
GB805503A
Cited
US3258500A
Cited
GB1000485A
Cited
DE1246703B
Cited
GB1070929A
Cited
US3607955A
Cited
US3650987A
Cited
US3787331A
Cited
US3803241A
Cited
US3755477A
Cited
US3793229A
Cited
US3752850A
Cited
GB1000083A
Cited
US4147733A
Cited
CA1196345A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-23 | 1992-02-22 | 1992-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-23 | 1996-02-22 | 1996-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-23 | 2000-02-22 | 2000-08-23 | $7700.00 | Window Closed / Lapsed |