PROCESS FOR SEPARATING PENTAFLUOROETHANE AND CHLOROPENTAFLUOROETHANE

摘要

The present invention pertains to a process for separating pentafluoroethane from a mixture with chloropentafluoroethane. A mixture of pentafluoroethane and chloropentafluoroethane is contacted with an entraining agent to form an azeotrope of the entraining agent and chloropentafluoroethane. Subsequently the pentafluoroethane is separated from the binary azeotrope of chloropentafluoroethane and entraining agent by distillation. Distillation is conducted such that the azeotrope of chloropentafluoroethane and entraining agent is removed as an overhead distillation fraction and the pentafluoroethane is removed as a bottoms distillation fraction.