AZEOTROPIC MIXTURE COMPOSED OF PENTAFLUOROETHANE AND HYDROGEN FLUORIDE AND PROCESS FOR PRODUCING PENTAFLUOROETHANE

摘要

The invention provides a minimum-boiling-point azeotropic binary mixture substantially composed of hydrogen fluoride (HF) and pentafluoroethane (HFC-125). Also provided is a process for producing HFC-125 comprising the steps of distilling a mixture containing HFC-125 and HF, drawing an azeotropic mixture out of the column top, and recovering either HFC-125-free HF or HF-free HFC-125 from the column bottom, thereby recovering more effectively either HFC-125-free HF or HF-free HFC-125 from the mixture containing HFC-125 and HF.