Process for the preparation of halogenated ethanes

C - Chemistry – Metallurgy – 07 – C

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C07C 17/21 (2006.01) C07C 17/38 (2006.01) C07C 19/08 (2006.01) C07C 19/12 (2006.01)

Patent

CA 2389803

A process for preparing halogenated ethanes, particularly pentafluoroethane, from a mixture produced by the reaction of perchloroethylene, hydrogen fluoride and a recycle stream. The preferred process utilizes phase separation techniques to ensure that less than the azzeotropic amount of HF is included in the product stream, thereby minimizing the hydrogen fluoride that is carried off with the desired products after they are separated from the reaction mixture, and at the same time prevents undesirable byproducts from being recycled to the reaction.

L'invention concerne un procédé relatif à l'élaboration d'éthanes halogénés, en particulier le pentafluoroéthane, à partir d'un mélange issu de la réaction entre les éléments suivants: perchloréthylène, fluorure d'hydrogène et flux de recyclage. En mode de réalisation préféré, on utilise des techniques de séparation de phase pour veiller à ce que le flux de produit résultant comporte une quantité de fluorure d'hydrogène inférieure à la quantité azéotropique, ce qui permet de réduire au minimum la quantité de fluorure d'hydrogène emmenée avec les produits désirés, une fois ces produits séparés du mélange réactionnel, et d'empêcher simultanément les sous-produits indésirables d'être recyclés dans la réaction.

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