Production of 1,1,1,2,3,3,3-heptafluoropropane

C - Chemistry – Metallurgy – 07 – C

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C07C 17/087 (2006.01) C07C 17/38 (2006.01) C07C 17/383 (2006.01) C07C 19/08 (2006.01)

Patent

CA 2373437

Preparation of HFC 227ea by reacting HFP with hydrogen fluoride comprising the steps of charging the reaction mixture therefrom to a liquid-phase separator, allowing a HFC 227ea-rich phase and a hydrogen fluoride-rich phase to separate under gravity, recycling the separated hydrogen fluoride-rich phase, charging the HFC 227ea-rich phase to a distillation column, recovering the HFC 227ea and an HF-rich mixture separately from the distillation column; and recycling the HF-rich mixture to the reactor.

La présente invention concerne un procédé de préparation de 1,1,1,2,3,3,3-heptafluoropropane (HFC 227ea) consistant à faire réagir un hexafluoropropane (HFP) avec un fluorure d'hydrogène. Ledit procédé consiste: à charger le mélange réactionnel dans un séparateur en phase liquide; à permettre à une phase riche en HFC 227ea de se séparer par effet de gravité; à recycler la phase riche en fluorure d'hydrogène; à charger la phase riche en HFC 227ea dans une colonne de distillation; à récupérer séparément le HFC 227ea et un mélange riche en fluorure d'hydrogène contenus dans la colonne de distillation; puis à recycler le mélange riche en fluorure d'hydrogène dans le réacteur.

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