C - Chemistry – Metallurgy – 07 – C
Patent
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.
Shibanuma Takashi
Tsuda Takehide
Yamada Yasufu
Daikin Industries Ltd.
Kirby Eades Gale Baker
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