Process for producing 2,3,3,3-tetrafluoropropene
AssigneeHoneywell International Inc.
InventorsSelma Bektesevic, Hsueh Sung Tung, Haiyou Wang
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Abstract
The present invention relates, in part, to the discovery that high temperatures during the fluorination of 1,1,2,3-tetrachloropropene (HCO-1230xa) to 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) results in catalyst instability, reduced selectivity of the conversion, and/or the formation of one or more undesirable by-products. By controlling the reaction temperature, it is shown that the catalyst life may be extended and the selectivity of the reaction improved. Such control similarly results in an overall improvement in the production of certain hydrofluoroolefins, particularly 2,3,3,3-tetrafluoropropene (HFO-1234yf).
Claims32
A process for preparing 2-chloro-3,3,3-trifluoropropene comprising:
- providing a starting composition comprising at least one compound of formula I
- CX2═CCl—CH2X (I)
- wherein X is independently selected from F, Cl, Br, and I, provided that at least one X is not fluorine;
- contacting said starting composition with a fluorinating agent to produce a final composition comprising 2-chloro-3,3,3trifluoropropene;
- and
- controlling the temperature of the contacting step such that it does not exceed about 300° C., and
- wherein the pressure of the reaction ranges from about 50 psig to about 125 psig.
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A process for preparing 2,3,3,3-tetrafluoroprop-1-ene comprising:
- (a) providing a starting composition comprising a compound of formula I
- CX2═CCl—CH2X (I)
- wherein X is independently selected from F, Cl, Br, and I, provided that at least one X is not fluorine;
- (b) contacting said starting composition with a first fluorinating agent to produce a first intermediate composition comprising 2-chloro-3,3,3-trifluoropropene and controlling the temperature during the contacting step such that it does not exceed about 300° C.;
- (c) contacting said first intermediate composition with a second fluorinating agent to produce a second intermediate composition comprising 2-chloro-1,1,1,2-tetrafluoropropane;
- and
- (d) dehydrochlorinating at least a portion of said 2-chloro-1,1,1,2-tetrafluoropropane to produce a reaction product comprising 2,3,3,3-tetrafluoroprop-1-ene.
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Dependencies are inferred from the claim text.