This work describes a new non-ideal shortcut method for distillation design and includes a graphical representation. Based on the operation leaves of Castillo et al. (1998) the method uses production segment rather than completely specified product which eliminates any sensitivity to the composition of the minor products. It has two aims. The first is to determine if a specified separation respects the mass balance and the thermodynamic feasibility. The second one is to find the minimum reflux ratio and a preliminary design of the column. The following mixtures are investigated: an ideal mixture of ethanol, n-propanol, and n-butanol; a non-ideal mixture of acetone, water, and acetic acid; and an azeotropic mixture of acetone, isopropanol, and water. Designs obtained with this new method lead to purity and recovery rate close to specifications which is sometimes impossible with conventional ideal shortcut like the well-known Fenske-Underwood-Gilliland shortcut.
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