Four hundred lbmol/h of an equimolar mixture of n-heptane andtoluene at 200oF and 20 psia is to be separated by extractive distillationat 20 psia, using phenol at 220oF as the solvent, at a flow rate of 1,200 lbmol/h. Design a suitable two-column system to obtain reasonableproduct purities with minimal solvent loss.

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