Question: We simulate a distillation column and find we can obtain the desired separation with 31 stages plus a partial reboiler and a total condenser if

We simulate a distillation column and find we can obtain the desired separation with 31 stages plus a partial reboiler and a total condenser if we use an $L / D=3$. With total reflux, we find that the desired separation is obtained with 13 stages plus a partial reboiler and a total condenser. Estimate $(\mathrm{L} / \mathrm{D})_{\min }$.

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