The binary distillation column simulates the separation of Methanol and Ethanol.  The overhead flow rate, overhead composition, bottom flow rate, and bottom composition are measured.  The vapor flow rate and reflux ratio are manipulated variables.  The Feed flow and feed concentration are treated as disturbances.

The model used has 27 trays, a reboiler on the bottom tray, and a total condenser on the overhead tray.  The 50%-50% feed mixture is fed at the fourteenth tray.  This model was originally created by K. Weischedel and T. J. McAvoy in 1980.