Process for obtaining a purified hydrofluoroalkane

C - Chemistry – Metallurgy – 07 – C

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C07C 17/395 (2006.01) C07C 17/38 (2006.01) C07C 17/383 (2006.01) C07C 17/386 (2006.01) C07C 17/389 (2006.01) C07C 19/08 (2006.01)

Patent

CA 2418856

Process for obtaining a hydrofluoroalkane which is purified of organic impurities, according to which the hydrofluoroalkane containing organic impurities is subjected to at least one purification treatment chosen from: (a) a treatment with chlorine in the presence of a initiator, (b) a reaction with hydrogen fluoride, (c) a distillation in which the purified hydrofluoroalkane is removed from the top of the distillation column or from the side, (d) an extractive distillation, (e) an adsorption onto a solid adsorbent, (f) a reaction with a compound containing oxygen, and (g) a reaction with a compound containing oxygen and a gas-phase reaction with a reagent capable of reacting with at least some of the organic impurities, with the exception of a reaction with elemental chlorine.

La présente invention concerne un procédé permettant d'obtenir un hydrofluoroalcane qui est purifié vis-à-vis des impuretés organiques. D'après ledit procédé, l'hydrofluoroalcane contenant des impuretés organiques est soumis à au moins un traitement de purification choisi parmi: (a) un traitement avec du chlore en présence d'un initiateur; (b) une réaction avec du fluorure d'hydrogène; (c) une distillation dans laquelle l'hydrofluoroalcane purifié est éliminé de la partie supérieure ou de la partie latérale de la colonne de distillation; (d) une distillation extractive; (e) une adsorption sur un adsorbant solide; (f) une réaction avec un composé contenant de l'oxygène; et (g) une réaction avec un composé contenant de l'oxygène et une réaction en phase gazeuse avec un réactif capable de réagir avec au moins certaines impuretés organiques, à l'exception d'une réaction avec du chlore élémentaire.

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