Process for producing 2,3,3,3-tetrafluoropropene

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 and at least one organic co-feed compound to produce first intermediate composition comprising 2-chloro-3,3,3-trifluoropropene;
• 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

A multistep process for preparing 2,3,3,3-tetrafluoropropene (1234yf) comprising:

• a.) contacting, in a first vapor phase reactor, in the presence of a vapor phase catalyst, 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, with a fluorinating agent, to produce a first intermediate composition comprising 2-chloro-3,3,3trifluoropropene (1233xf), HCl and one or more organic co-feed compounds, said one or more organic co-feed compounds being other than the compound of formula I;
• b.) separating said HCl, said 2-chloro-3,3,3trifluoropropene (1233xf), and said one or more organic co-feed compounds from said first intermediate composition;
• c) recycling an effective amount of said separated one or more organic co-feed compounds to said first vapor phase reactor;
• d.) contacting, in a liquid phase reactor, said separated 2-chloro-3,3,3trifluoropropene (1233xf) with a second fluorinating agent to produce a second intermediate composition comprising 2-chloro-1,1,1,2-tetrafluoropropane (244bb);
• and
• e.) dehydrochlorinating, in a second vapor phase reactor, at least a portion of said 2-chloro-1,1,1,2-tetrafluoropropane (244bb) to produce a reaction product comprising 2,3,3,3-tetrafluoropropene.