PREPARATION OF CARBON TETRACHLORIDE AND HEXACHLOROETHANE FROM SUBSTANCE CONTAINING CHLORINATED HYDROCARBONS HAVING NUMBER OF CARBON ATOMS OF 1 AND 2

摘要

PURPOSE:To prepare industrially useful CCl4 and CCl3CCl3, easily and at low cost, by chlorinating a substance containing 1-2C chlorinated hydrocarbons, which is industrial waste, in an anhydrous condition and in the presence of free-radical initiators. CONSTITUTION:A mixture containing 1-2C chlorinated hydrocarbons, which is discharged in the process of vinyl chloride monomer production, trichloroethylene prechloroethylene production, etc., is dehydrated by distillation, etc. Subsequently, said mixture is brought into contact with chlorine or a chlorine-containing gas in the presence of a free-radical initiator (preferably azobisnitriles) under the pressure sufficiently high to keep said mixture liquid, to convert 1C compound into CCl4 and 2C compound into CCl3CCl3 (solid), which are separated and recovered. Reaction temperature is 30-150 deg.C, preferably 40-120 deg.C.