Process for separating hydrogen fluoride from difluoromethane

C - Chemistry – Metallurgy – 01 – B

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C01B 7/19 (2006.01) C07C 17/38 (2006.01) C07C 17/383 (2006.01) C07C 19/08 (2006.01)

Patent

CA 2143268

L'invention concerne la séparation du fluorure d'hydrogène (HF) et du difluorométhane (F32) par distillation et/ou condensation fractionnée, en une ou plusieurs étapes. Le procédé selon l'invention comprend au moins une étape permettant d'obtenir un flux dont les teneurs en HF et F32 correspondent sensiblement à celles de la composition azéotropique, cette étape étant effectuée sous une pression choisie de façon telle que la pression partielle du mélange HF + F32 dudit flux (Pa en bars absolus) soit liée à la teneur en HF dudit mélange (x en pourcent poids) par la relation suivante: Pa = 17 - 22,9(x+0,821)ln(x+0,608) + 56,6 [ln(x+0,608)]2.

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