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The standard commercially used ternary agent for the upgrading of 190 proof ethanol to anhydrous ethanol is benzene. The primary disadvantages of a benzene ternary system are due to the narrow difference in boiling point betweeen the benzene-water-ethanol ternary and pure ethanol. The purposes of this project were to obtain some measure of the difference in energy requirement between use of dichloromethane and benzene as ternary distillation agents and to determine whether dichloromethane losses to the environment could be eliminated by use of a vent scrubbing system. A laboratory size distillation system was operated to concentrate an ethanol-water solution to the ethanol-water azeotrope (95%) and then to remove the remaining water by using dichloromethane and benzene as ternary distillation agents. A vent scrubbing system was used to prevent losses of organic materials from the distillation system. The results of the project indicate that energy requirements of a dichloromethane ternary distillation column are approximately 30% of the energy required in a benzene ternary column. The vent scrubbing system completely eliminated loss of dischloromethane to the environment even when cooling water temperatures were adjusted to approximate midsummer temperature conditions. (ERA citation 08:057026)