Patent ID: 6846963

Claim:
A process for depressing corrosion of a metal material of a reactor while producing 1,1,1,3,3-pentafluoropropane, wherein said process comprises: a liquid-phase reaction step for fluorination of 1,1,1,3,3-pentahalopropane with HF, wherein at least one of the halogen atoms in said 1,1,1,3,3-pentahalopropane is not F, wherein said 1,1,1,3,3-pentahalopropane is fluorinated in the presence of antimony pentahalide as a catalyst in said reactor to obtain a reaction mixture comprising at least 1,1,1,3,3-pentafluoropropane and antimony pentahalide as the catalyst, wherein the fluorination is conducted at a reaction temperature at less than 50° C. while HF exists in a reaction system in an amount of at least 5 times by mole as large as an amount of said antimony pentahalide; and depressing corrosion of the metal material of said reactor.