C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 19/08 (2006.01) B01J 27/10 (2006.01) C07C 17/20 (2006.01) C07C 17/38 (2006.01) C07C 17/383 (2006.01)
Patent
CA 2264691
The present invention is directed to a process for refining difluoromethane by removing water which is contained in the difluoromethane and has been believed to be difficult to remove. The process comprises distilling difluoromethane which contains water so as to obtain difluoromethane as a distillate and a mixture as a bottom product of difluoromethane and chlorofluoromethane and/or dichloromethane which mixture contains water. The bottom product is recycled to a reaction step to be reused together with a feedstock.
L'invention se rapporte à un procédé de raffinage de difluorométhane, qui consiste à évacuer l'eau contenue dans le difluorométhane, que l'on estimait difficile à évacuer. Ledit procédé consiste à distiller du difluorométhane contenant de l'eau pour obtenir un distillat contenant du difluorométhane et des résidus contenant un mélange de difluorométhane qui contient de l'eau avec du chlorofluorométhane et/ou du dichlorométhane. Les résidus sont recyclés lors des étapes de réaction pour être réutilisés avec le substrat.
Shibanuma Takashi
Tsuda Takehide
Daikin Industries Ltd.
Kirby Eades Gale Baker
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