Purification methods of pentafluoroethane

Details Purification methods of pentafluoroethane Purification methods of pentafluoroethane

C - Chemistry, Metallurgy

07

C

C07C 19/08 (2006.01) B01J 23/44 (2006.01) B01J 23/46 (2006.01) C07C 17/23 (2006.01) C07C 17/395 (2006.01)

Patent

CA 2196194

The purification of pentafluoroethane (HFC-125) which is composed of a process A, in which an unpurified mixture (1), containing at least chloropentafluoroethane (CFC-115) and pentafluoroethane (HFC-125) is reacted with hydrogen (4) in the presence of a catalyst in gas phase to reduce the said chloropentafluoroethane (CFC-115); and a process B, in which a reaction mixture produced by the preceding reaction is separated into a first mixture (3) composed mainly of hydrogen and a second mixture (2), composed mainly of pentafluoroethane (HFC-125). In this method, purification is performed by adding the said first mixture (3) to the said unpurified mixture (1) in a state that the hydrogen chloride is removed from the first mixture (3) in process B until the level of hydrogen chloride drops to 0.5 or less than that of CFC-115 in the unpurified mixture (1) in the molar ratio, or hydrogen chloride is removed from the said reaction mixture until, when mixed with the unpurified mixture (1), the level of hydrogen chloride drops to 0.5 or less than that of CFC-115 in the mixture in the molar ratio. Thus, CFC-115 can be exterminated (or removed) cheaply and efficiently without decreasing it's reactivity (or activity) and a high yield of HFC-125 can be obtained.

L'invention se rapporte à un procédé de purification du pentafluoroéthane consistant à (A) effectuer une réaction catalytique en phase vapeur d'un mélange non purifié (1) contenant au moins du chloropentafluoroéthane (CFC-115) et du pentafluoroéthane (HFC-125) avec de l'hydrogène (4) pour réduire le CFC-115, et à (B) séparer le mélange réactionnel obtenu en un premier mélange (3) comprenant principalement de l'hydrogène, et un second mélange (2) comprenant principalement du HFC-125, le chlorure d'hydrogène obtenu étant retiré du premier mélange (3) à l'étape C jusqu'à ce que la quantité de chlorure d'hydrogène restant dans ce mélange soit réduite à 0,5 mole ou moins, par mole de CFC-115 présent dans le mélange (1), ou bien le premier mélange (3) est ajouté au mélange non purifié (1) après que le chlorure d'hydrogène ait été extrait du mélange réactionnel ci-dessus jusqu'à ce que la quantité de chlorure d'hydrogène restant dans celui-ci soit réduite à 0,5 mole ou moins, par mole de CFC-115 présent dans le mélange (1). On peut obtenir le HFC-125 cible à haut rendement en retirant efficacement le CFC-115, ceci à faible coût, sans réduire la réactivité (ou l'activité).

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