Method for preparing 2,3,3,3-tetrafluoro-1-propene
AssigneeArkema France
InventorsMichel Devic, Dominique Guillet, Emmanuel Guiraud, Laurent Wendlinger
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Abstract
The invention relates to a gas-phase continuous method for preparing 2,3,3,3-tetrafluoro-1-propene, said method comprising the following steps: (i) hydrogenation of hexafluoropropylene to form 1,1,1,2,3,3-hexafluoropropane; (ii) dehydrofluorination of the 1,1,1,2,3,3-hexafluoropropane obtained in the previous step to 1,2,3,3,3-pentafluoropropene-1; (iii) hydrogenation of the 1,2,3,3,3-pentafluoropropene-1 obtained in the previous step to form 1,1,1,2,3-pentafluoropropane; and (iv) dehydrofluorination of the 1,1,1,2,3-pentafluoropropane obtained in the previous step to form 2,3,3,3-tetrafluoro-1-propene.
Claims21
A continuous gas-phase process for preparing 2,3,3,3-tetrafluoro-1-propene, comprising the following steps:
- (i) hydrogenation of hexafluoropropyylene to 1,1,1,2,3,3-hexafluoropropane;
- (ii) dehydrofluorination of the 1,1,1,2,3,3-hexafluoropropane obtained in the preceding step to 1,2,3,3,3-pentafluoro-1-propene;
- (iii) hydrogenation of the 1,2,3,3,3-pentafluoro-1-propene obtained in the preceding step to 1,1,1,2,3-pentafluoropropane;
- (iv) dehydrofluorination of the 1,1,1,2,3-pentafluoropropane obtained in the preceding step to 2,3,3,3-tetrafluoro-1-propene.
The process as claimed in claim, in which, after step (iii), a separation is performed, a stream of 1,1,1,2,3,3-hexafluoropropane and optionally of HF is recovered, and is recycled into the start of the process, and a stream of 1,1,1,2,3-pentafluoropropane and optionally of hydrogen, is recovered and sent into step (iv).
Dependencies are inferred from the claim text.