Patent EP0331991A2 successfully refreshed from Google Patents.
EP0331991A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Gas-phase fluorination process
Assignee: EIDP Inc
•
Filing: 1989-02-24
•
Granted: —
•
Expires: 2009-02-24
Abstract
Abstract An improved process for the manufacture of 1,1,1,2-tetrafluoroethane, more particularly, a gas-phase reaction of 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
EP
Data Source
google_patents
Last Synchronized
2026-11-03 15:16
CPC Classifications
C; C07; C07C; C07C19/00; C07C19/08; C07C17/00; C07C17/093; C07C17/20; C07C17/202; C07C17/206
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
97 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 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
97 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 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
43 words
The process of Claim 1 wherein the HF is contacted with the 1,1,1-trifluorochloroethane at a mol ratio of about 3/1 to about 30/1, at a temperature of about 300°C to about 500°C, and a contact time of about 0.1 to about 60 seconds.
Claim 6
Dependent Claim
43 words
The process of Claim 4 wherein the HF is contacted with the 1,1,1-trifluorochloroehtane 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
43 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
20 words
The process of Claim 1 wherein the metal is supported on carbon and the product stream contains substantially no CF₂=CHCl.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.