Process for producing chlorotrifluoroethylene
View Patent ↗The present invention relates, at least in part, to a process for making chlorotrifluoroethylene (CFO-1113) from 1,2-dichloro-1,1,2-trifluoroethane (HCFC-123a). In certain aspects, the process includes dehydrochlorinating 1,2-dichloro-1,1,2-trifluoroethane (HCFC-123a) in the presence of a catalyst selected from the group consisting of (i) one or more metal halides; (ii) one or more halogenated metal oxides; (iii) one or more zero-valent metals or metal alloys; (iv) combinations thereof.
1. A process for producing chlorotrifluoroethylene (CFO-1113) comprising: dehydrochlorinating 1,2-dichloro-1,1,2-trifluoroethane (HCFC-123a) in the presence of a catalyst selected from the group consisting of (i) one or more metal halides; (ii) one or more halogenated metal oxides; (iii) one or more zero-valent metals or metal alloys; and (iv) combinations thereof to produce a reaction product comprising CFO-1113, wherein the catalyst comprises fluorinated MgO and one or more of a fluorinated Cs 2 O, a fluorinated Li 2 O, a fluorinated Na 2 O, and/or a fluorinated K 2 O, and wherein said fluorinated Cs 2 O, fluorinated Li 2 O, fluorinated Na 2 O, and/or fluorinated K 2 O is present in an amount of about 5.0 wt. % to about 50 wt % based on the total weight of the catalyst.
2. The process of claim 1 wherein the conversion of HCFC-123a is at least about 5 wt. %.
3. The process of claim 2 wherein a selectivity to chlorotrifluoroethylene is at least about 70 wt. %.
4. The process of claim 3 wherein said reaction product comprises less than about 10 wt. % of a compound of the formula C 2 Cl 2 F 2 (CFO-1112).
5. The process of claim 1 wherein the dehydrochlorinating step is conducted at a temperature greater than about 400° C.
6. The process of claim 1 wherein a said dehydrochlorinating step comprises dehydrochlorinating at a temperature of from about 480° C. to about 550° C.
7. A process for producing chlorotrifluoroethylene (CFO-1113) comprising: dehydrochlorinating 1,2-dichloro-1,1,2-trifluoroethane (HCFC-123a) in the presence of a catalyst selected from the group consisting of (i) one or more metal halides; (ii) one or more halogenated metal oxides; (iii) one or more zero-valent metals or metal alloys; and (iv) combinations thereof to produce a reaction product comprising CFO-1113, wherein the zero valent metal or zero valent metal alloy comprises one or more of Pd, Pt, Ru, Rh, and/or Ir supported on MgO.
8. The process of claim 7 wherein the Pd, Pt, Ru, Rh, and/or Ir present in an amount of about 0.05 to about 5 wt % based on the total weight of the catalyst.