Natural Disturbance Block Design Workbook

The invention provides a process for the preparation of 1,1,1,2,2-pentafluoroethane by fluorinating in the gas phase a halogenated hydrocarbon feedstock containing 2-chloro-1,1,1,2-tetrafluoroethane with hydrogen fluoride, the process being characterized in that:(i) a fluorinated chromium oxide obtained by fluorinating a chromium oxide represented by the formula: CrOm (1.5mixing ratio (by mole) of hydrogen fluoride to halogenated hydrocarbon feedstock ranges from 1.5 to 10, and(iii) the fluorination is conducted at a temperature of 250 to 350° C. The process makes it possible to prepare easily HFC-125 reduced in the contents of CFCs.