Patent ID: 8030528

Claim:
A process for producing 1,2,3,4-tetrachlorohexafluorobutane, comprising causing 1,2,3,4-tetrachlorobutane to react with fluorine gas in a liquid phase or in a solid-liquid coexistence state in the absence of a solvent and a catalyst, wherein the 1,2,3,4-tetrachlorobutane is mainly obtained by a chlorination reaction of 3,4-dichlorobutene-1, in the 1,2,3,4-tetrachlorobutane obtained by the chlorination reaction of the 3,4-dichlorobutene-1, a dl form which is an optical isomer is contained in an amount of not less than 40% by mass, and the reaction temperature of the reaction is in the range of 0 to 60° C.