Purification of 1,1,1,3,3-pentafluoropropane

Details Purification of 1,1,1,3,3-pentafluoropropane Purification of 1,1,1,3,3-pentafluoropropane

C - Chemistry, Metallurgy

07

C

C07C 19/08 (2006.01) C07C 17/38 (2006.01) C07C 17/395 (2006.01)

Patent

CA 2251712

A process for producing a substantially pure polyfluorinated aliphatic hydrocarbon from a crude reaction solution thereof containing unsaturated hydrocarbon and halogenated saturated and unsaturated aliphatic hydrocarbon impurities is disclosed. The process comprises, as a first step, treating said crude reaction solution with a dehydrohalogenation agent that does not substantially react with the polyfluorinated aliphatic hydrocarbon. The treatment converts the halogenated aliphatic impurities into olefinic impurities. As a second step to the process of this invention, the solution formed from the first step is further treated with an agent that transforms the olefinic hydrocarbon impurities into compounds that have a boiling point higher than the desired polyfluorinated aliphatic hydrocarbon. The transformed impurities are then separated from the polyfluorinated aliphatic hydrocarbon.

Divulgation d'un procédé pour produire un hydrocarbure aliphatique polyfluoré pratiquement pur, à partir d'un mélange réactionnel brut contenant un hydrocarbure insaturé et des impuretés d'hydrocarbures aliphatiques halogénés saturés et non saturés. La première étape de ce procédé consiste à traiter le mélange réactionnel brut avec un agent de déshydrohalogénation qui ne réagit pratiquement pas avec l'hydrocarbure aliphatique polyfluoré. Ce traitement sert à convertir les impuretés aliphatiques halogénées en impuretés oléfiniques. La deuxième étape de ce procédé consiste à traiter la solution obtenue après la première étape avec un agent qui transforme les impuretés oléfiniques hydrocarbonées en composés ayant un point d'ébullition supérieur à celui de l'hydrocarbure aliphatique polyfluoré recherché. Les impuretés transformées sont alors séparées de l'hydrocarbure aliphatique polyfluoré.

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