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ABSTRACT
Salt-effect distillation is a novel variation on extractive distillation in which the agent added to the column to effect the separation is a salt rather than a liquid. The technique, which can offer major energy savings over conventional processing, is attracting renewed interest at present, primarily in the dehydration of ethanol for gasoline-alcohol fuel blends. Details of the technique, its chemistry, its advantages and problems, and some of its applications are discussed. More detailed reviews are cited.