Separating and removing impurities from tetrafluoroethanes...

Details Separating and removing impurities from tetrafluoroethanes... Separating and removing impurities from tetrafluoroethanes...

C - Chemistry, Metallurgy

07

C

C07C 19/08 (2006.01) C07C 17/386 (2006.01) C07C 19/12 (2006.01)

Patent

CA 2184474

The disclosure relates to separating 1,1,2,2 tetrafluoroethane (HFC-134) and 1,1,1,2 tetrafluoroethane (HFC-134a) from each other and/or from fluorocarbon impurities by using extractive distillation with an extractive agent comprising an alcohol. Examples of suitable extractive agents comprise at least one member from the group of methanol, butanol, ethanol, propanol, their isomers and cyclic compounds thereof, among others.

Dans cette invention, on sépare du 1,1,2,2 tétrafluoroéthane (HFC-134) et du 1,1,1,2 tétrafluoroéthane (HFC-134a) l'un de l'autre et/ou d'impuretés à base de fluorocarbone, en utilisant la distillation extractive avec un agent d'extraction contenant un alcool. Comme agents d'extraction appropriés, on peut utiliser au moins un élément choisi dans le groupe constitué par méthanol, butanol, éthanol, propanol, leurs isomères et des composés cycliques de ceux-ci, notamment.

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