METHOD OF SYNTHESIS OF PENTAFLUOROETHANE Russian patent published in 2001 - IPC

FIELD: organic chemistry, chemical technology. SUBSTANCE: invention relates to method of synthesis of pentafluoroethane containing 1-chloropentafluoroethane in the amount below 0.02 wt. %. Pentafluoroethane is synthesized in the process of conversion of tetrafluorochloroethane CF₃CHC1F in gaseous phase in the presence of chrome oxide catalyst (Cr₂O₃) applied on carrier containing AlF₃ followed by its isolation from compounds obtained. The above mentioned carrier has fluorine content corresponding to at least to 90% of AlF₃ with respect to total carrier weight. Process is carried out at 140-300 C and time contact for 0.1-30 s. Synthesized pentafluoroethane has small amount of 1-chloropentafluoroethane. EFFECT: improved method of synthesis, small amount of impurity. 7 cl, 5 ex