Process for producing difluoromethane

Details Process for producing difluoromethane Process for producing difluoromethane

C - Chemistry, Metallurgy

07

C

C07C 19/08 (2006.01) C01B 7/19 (2006.01) C07C 17/20 (2006.01) C07C 17/38 (2006.01)

Patent

CA 2264686

A process for refining difluoromethane by removing hydrogen fluoride which is contained in difluoromethane and has been believed to be difficult to remove, which process comprises distilling a mixture of difluoromethane with hydrogen fluoride and bringing an azeotropic mixture of both compounds as a distillate into contact with sulfuric acid, whereby hydrogen fluoride contained in difluoromethane is absorbed by sulfuric acid.

L'invention se rapporte à un procédé de raffinage de difluorométhane, qui consiste à évacuer le fluorure d'hydrogène contenu dans le difluorométhane, que l'on estimait difficile à évacuer. Ledit procédé consiste à distiller un mélange de difluorométhane et de fluorure d'hydrogène et à amener un mélange azéotropique des deux composés sous forme de distillat au contact d'acide sulfurique. Le fluorure d'hydrogène contenu dans le difluorométhane est alors absorbé par l'acide sulfurique.

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