Compositions and methods for synthesis of 2,3-dichloro-1,1,1,2-tetrafluoropropane and 2,3,3,3-tetrafluoropropene
AssigneeThe Chemours Company Fc, LLC
InventorXUEHUI SUN
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Abstract
A method of synthesizing 2,3,3,3-tetrafluoropropene (1234yf) from 2-chloro-3,3,3-trifluoropropene (1233xf). The 2-chloro-3,3,3-trifluoropropene (1233xf) is reacted in the vapor phase, in the presence of a catalyst, at a temperature and pressure sufficient to selectively convert the 2-chloro-3,3,3-trifluoropropene (1233xf) to 2,3,3,3-tetrafluoropropene (1234yf) without the use of antimony-based catalysts.
Claims18
A method of synthesizing 2,3,3,3-tetrafluoropropene comprising:
- a) contacting 2-chloro-3,3,3-trifluoropropene in the vapor phase or liquid phase with chlorine gas, in the presence or absence of HF, in the presence of a first catalyst, to form 2,3-dichloro-1,1,1,2-tetrafluoro-propane when HF is present, or through an intermediate 1,2,2-trichloro-3,3,3-trifluoro-propane in the absence of HF;
- b) optionally recovering the 1,2,2-trichloro-3,3,3-trifluoro-propane;
- c) optionally contacting the 1,2,2-trichloro-3,3,3-trifluoro-propane in the vapor phase or liquid phase with hydrogen fluoride to form 2,3-dichloro-1,1,1,2-tetrafluoro-propane;
- d) contacting the 2,3-dichloro-1,1,1,2-tetrafluoro-propane in the vapor phase with hydrogen gas in the presence of a second catalyst to form 2,3,3,3-tetrafluoropropene to form a product composition.
A method of synthesizing 2,3,3,3-tetrafluoropropene comprising:
- a) contacting 2-chloro-3,3,3-trifluoropropene in the vapor phase or liquid phase with chlorine gas and hydrogen fluoride in the presence or absence of a first catalyst to form 2,3-dichloro-1,1,1,2-tetrafluoro-propane;
- b) contacting the 2,3-dichloro-1,1,1,2-tetrafluoro-propane in the vapor phase with hydrogen gas the presence of a second catalyst to form 2,3,3,3-tetrafluoropropene.
A method of synthesizing 1-chloro-2,3,3,3-tetrafluoropropene comprising:
- a) contacting 2-chloro-3,3,3-trifluoropropene in the vapor phase or liquid phase with chlorine gas in the presence of a first catalyst, in the presence or absence of HF to form a first reaction product
- b) recovering the first reaction product which comprises one of 1,2,2-trichloro-3,3,3-trifluoropropane in the absence of HF or 2,3-dichloro-1,1,1,2-tetrafluoro-propane in the presence of HF;
- c) contacting the 1,2,2-trichloro-3,3,3-trifluoropropane in the vapor phase or liquid phase with hydrogen fluoride to form 2,3-dichloro-1,1,1,2-tetrafluoro-propane;
- d) dehydrochlorinate 2,3-dichloro-1,1,1,2-tetrafluoro-propane to 1-chloro-2,3,3,3-tetrafluoropropene in liquid phase with a caustic or in the vapor phase with or without a catalyst.
The method of claim 16 wherein 2,3-dichloro-1,1,1,2-tetrafluoro-propane is dehydrochlorinated to form 1-chloro-2,3,3,3-tetrafluoropropene in a liquid phase with at least one caustic.
A composition comprising one of (a) 234bb and 234da or (b) 233ab and 233da and (a) comprises at least one additional compound selected from the group consisting of 243ab, 1223xd, 1233xf, 1223xd, 233ab, 233da, 1234yf, 1243zf, CF3COF, CHCl3, 234bb(Br), 1224yd, 224bb, 243db, 243db(B), C6H3Cl2F7, CF3CFClCH2OCH2CFClCF3, 225ca, 225cb, 1232, 234 isomers, and CHCl3 and (b) comprises least one additional compound selected from the group consisting of 245cb, 244bb, 1233xf, 1223xd, 1231xf, 223db, C2HCl5, 254eb, and C4HCl3F4.
The composition of claim 19 wherein the amount of the additional compound (a) ranges from greater than 0 to about 9% and (b) ranges from greater than 0 to about 1%.
Dependencies are inferred from the claim text.