Process for producing 2,3,3,3-tetrafluoropropene
AssigneeHoneywell International Inc.
InventorsHaiyou Wang, Daniel C. Merkel, Hsueh Sung Tung, Selma Bektesevic
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Abstract
The invention relates to a process to prepare 2-chloro-3,3,3-trifluoropropene (HCO-1233xf) or 2-chloro-1,1,12-tetrafluoropropane (HCFC-244bb) using dichloro-trifluoropropanes and/or trichloro-difluoropropanes, and to prepare 2-chloro-3,3,3-trifluoropropene (HCO-1233xf) using various 242 and 243 isomers.
Claims18
A process to prepare 2-chloro-1,1,12-tetrafluoropropane (HCFC-244bb) comprising contacting a compound selected from the group consisting of a dichloro-trifluoropropane, a trichloro-difluoropropane, and combinations thereof, with anhydrous hydrogen fluoride (HF) under conditions effective to produce HCFC-244bb.
A process to prepare 2-chloro-3,3,3-trifluoropropene (HCO-1233xf) and 2-chloro-1,1,1,2-tetrafluoropropane (244bb) comprising a contacting step comprising contacting at least one compound of Formulae (I), (II), (III)
- CX2═CCl—CH2X (I)
- CX3—CCl═CH2 (II)
- CX3—CHCl—CH2X (III)
- wherein X is independently selected from F, Cl, Br, and I, provided that at least one X is not fluorine, with anhydrous hydrogen fluoride (HF) in the presence of a catalyst under conditions effective to form a composition comprising HCO-1233xf and a by-product selected from the group consisting of a dichloro-trifluoropropane, a trichloro-difluoropropane and combinations thereof;
- recovering the by-product from the composition;
- recycling the by-product to the contacting step wherein the by-product is converted to 2-chloro-1,1,1,2-tetrafluoropropane (244bb).
A process to prepare 2-chloro-3,3,3-trifluoropropene (HCO-1233xf) comprising contacting 1,1,1-trifluoro-2,2-dichloropropane (243ab) with a dehydrochlorination catalyst under conditions effective to form 1233xf.
A process to prepare 2-chloro-1,1,1,2-tetrafluorpropane (244bb) comprising contacting 2-chloro-3,3,3-trifluoropropene (HCO-1233xf) with HF in a reaction zone under conditions effective to form a composition comprising 244bb and 1,1,1-trifluoro-2,2-dichloropropane (243ab);
- contacting the 243ab with a dehydrochlorination catalyst selected from the group consisting of carbon solids, metal halides, halogenated metal oxides, zero metals and combinations thereof under conditions effective to form 1233xf;
- and recycling the formed 1233xf to the reaction zone.
A process to prepare 2-chloro-3,3,3-trifluoropropene (HCO-1233xf) comprising contacting at least one compound selected from the group consisting of 2,2-dichloro-1,1,1-trifluoropropane (HCFC-243ab), 1,2-dichloro-1,1,2-trifluoropropane (HCFC-243bc), 1,2,2-trichloro-1,1-difluoropropane (HCFC-242ac), and 1,2-dichloro-1,1,2-trifluoropropane (HCFC-243bc) in the presence of HF under conditions effective to form (HCO-1233xf).
Dependencies are inferred from the claim text.