1 top product condenser,  2 phase separation tank,  3 actuating valves (reflux ratio),  4 cooling water flow meter,  5 sieve tray or packed column,  6 evaporator,  7 bottom heat exchanger,  8 feed pump,  9 bottom product tank,  10 feed tank,  11 control cabinet with displays and controls,  12 top product tank,  13 water jet pump