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US 2014/0275652 A1Published application
Integrated process to produce 2,3,3,3-tetrafluoropropene
AssigneeHoneywell International Inc.
InventorsHaiyou Wang, Selma Bektesevic, Daniel C. Merkel, Hsueh Sung Tung, Konstantin A. Pokrovski
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Abstract
The invention relates to a separation process whereby 2-chloro-3,3,3-trifluoropropene (1233xf) is separated from a mixture containing other fluorinated organics and high boiling materials such as dimers using azeotropes of HF formed by adding appropriate amounts to the mixture which facilitate separation by, e.g. distillation.
Claims20
A separation process which comprises:
- providing a first composition comprising
- i) 2-chloro-3,3,3-trifluoropropene (1233xf),
- ii) one or more organics selected from the group consisting of trichlorofluoropropene (1231) isomers, 2,3-dichloro-3,3-difluoropropene (1232xf), 2-chloro-1,1,1,2-tetrafluoropropane (244bb), 1,1,1,2,2-pentafluoropropane (245cb), dichlorotrifluoropropane (243) isomers, trichlorodifluorpropane (242) isomers;
- adding HF to said first composition in an amount effective to form a second composition comprising HF-azeotropes of 1233xf and of at least one of the organics;
- and
- separating the HF azeotropes from the second composition.
3 more elements
A process to prepare 2-chloro-3,3,3-trifluoropropene (1233xf) comprising providing a starting composition comprising at least one starting compound of formula I, II and/or formula 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;
- (a) contacting said starting composition with a fluorinating agent under conditions effective to produce a first composition comprising 1233xf, unreacted fluorinating agent, HCl, optionally unreacted starting compound, and one or more organics selected from the group consisting of trichlorofluoropropene (1231) isomers, 2,3-dichloro-3,3-difluoropropene (1232xf), 2-chloro-1,1,1,2-tetrafluoropropane (244bb), 1,1,1,2,2-pentafluoropropane (245cb), dichlorotrifluoropropane (243), trichlorodifluorpropane (242), and one or more dimers selected from the group consisting of C6H3F6Cl, C6H3F7Cl2, C6F6Cl2, C6H8Cl2, C6F5Cl3, C6H3F2Cl5, and combinations thereof;
- (b) separating, from the first composition, a second composition comprised of an amount of 1233xf and substantially all of said organics and dimers;
- (c) adding HF to the second composition in an amount effective to form a third composition comprising HF-azeotropes of 1233xf and at least one of the organics, said second composition further comprising the dimers;
- (d) separating the HF-azeotropes from the third composition;
- and
- (e) recovering 1233xf from the HF-azeotopes of separated in step (d).
7 more elements
Dependencies are inferred from the claim text.