abstract |
The present invention relates to 1,1,2,2-tetrafluoroethane or 1,1,2,2-tetrafluoroethane from a mixture comprising both 1,1,1,2-tetrafluoroethane and 1,1,2,2-tetrafluoroethane. A method for separating 1,1,2-tetrafluoroethane, wherein at least one ionic liquid is used to improve the efficiency of separation. |