A plant for the sepn. of EtOH (90% purity) from its. aq. soln. was designed. The plant consisted of an evaporator and a rectification column. The feed stream contained H2O, EtOH as well as non-volatile and low-volatile chem. compds. The non-random two-ligs. (NRTL) equation was used to describe the EtOH-H2O equil. The whole technoL process was based on the assumption that the feed stream was directed into evaporator under reduced pressure, where EtOH and some H2O were distilled off. The vapors were compressed to the ambient pressure, condensed and directed to the rectification column. The design was optimized for energy consumption.