Process for the preparation of 1,1,1,3,3-pentafluoropropane

Details Process for the preparation of 1,1,1,3,3-pentafluoropropane Process for the preparation of 1,1,1,3,3-pentafluoropropane

C - Chemistry, Metallurgy

07

C

C07C 17/23 (2006.01) C07C 17/20 (2006.01) C07C 17/278 (2006.01) C07C 19/08 (2006.01)

Patent

CA 2166971

This invention is related to the preparation of hydrofluorocarbons (HFCs). Specifically, it relates to the manufacture of 1,1,1,3,3-pentafluoropropane, CF3CH2CF2H (HFC-245fa) by the steps comprising (1) the formation of CCl3CH2CCl3 by the reaction of CCl4 with vinylidene chloride; (2) the conversion of CCl3CH2CCl3 to CF3CH2CF2Cl by reaction with HF in the presence of a fluorination catalyst, selected from TiCl4, SnCl4 or mixtures thereof; and (3) reduction of CF3CH2CF2Cl to CF3CH2CF2H.

L'invention porte sur la préparation d'hydrofluorocarbones (HFC) et en particulier sur la fabrication de pentafluoropropane-1,1,1,3,3, CF3CH2CF2H (HFC-245FA) selon les étapes suivantes: (1) formation de CCl3CH2CCl3 par réaction de CCl4 avec du chlorure de vinylidène, (2) transformation du CCl3CH2CCl3 en CF3CH2CF2Cl par réaction avec le HF en présence d'un catalyseur de fluoration choisi parmi TiCl4, SnCl4 ou leur mélange, et (3) réduction du CF3CH2CF2Cl en CF3CH2CF2H.

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