Processes for synthesis of 1,3,3,3-tetrafluoropropene

C - Chemistry – Metallurgy – 07 – C

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C07C 21/18 (2006.01) C07C 17/269 (2006.01) C07C 17/272 (2006.01) C07C 17/358 (2006.01)

Patent

CA 2564897

Disclosed is a process for the synthesis of 1,3,3,3-tetrafluoropropene which comprises, in one embodiment, reacting a compound of CF3X1 with a compound of CX2H=CHX3, wherein X1, X2, and X3 are each independently selected from the group consisting of fluorine, chlorine, bromine and iodine, to produce a reaction product comprising a compound of CF3CH=CHX3, wherein X3 is as described above; and when X3 is not fluorine, fluorinating the compound to produce 1,3,3,3-tetrafluoropropene. The process in another embodiment comprises preparing tetrafluoropropene comprising thermally cracking one or more compounds capable of producing a reaction mixture which preferably comprises diflurocarbene radicals and vinylidene fluoride, and converting said reaction mixture into -tetrafluoropropene (1,3,3,3-tetrafluoropropene).

L'invention concerne un procédé pour la synthèse de 1,3,3,3-tétrafluoropropène. Ce procédé consiste à, dans un mode de réalisation, faire réagir un composé de CF¿3?X?1¿ avec un composé de CX?2¿H=CHX?3¿, X?1¿, X?2¿, et X?3¿ étant chacun indépendamment sélectionnés dans le groupe comprenant: fluor, chlore, brome, et iode, pour produire un produit réactionnel comprenant un composé de CF¿3?CH=CHX?3¿, X?3¿ étant décrit ci-dessus; et lorsque X?3¿ ne désigne pas du fluor, l'invention consiste à fluorer le composé pour produire 1,3,3,3-tétrafluoropropène. Le procédé, dans un autre mode de réalisation, consiste à préparer du tétrafluoropropène. Ce procédé consiste à craquer thermiquement au moins un composé permettant de produire un mélange réactionnel comprenant de préférence des radicaux de diflurocarbène et du fluorure de vinylidène, et à convertir ce mélange réactionnel en tétrafluoropropène (1,3,3,3-tétrafluoropropène).

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