FIELD: rectification processes. SUBSTANCE: initial mixture is fed into column wherein countercurrent liquid-gas interaction takes place on contact grades for stripping low-boiling components. Liquid flowing down from lower part of column is heated in evaporator and ascending vapors are condensed in dephlegmator. Upper and lower rectification products are withdrawn. According to invention, initial mixture, prior to be fed into column, recycles between charging stock tank and dephlegmator functioning as cooling liquid. EFFECT: enhanced efficiency of process. 1 dwg
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