A water and n-butanol mixture is separated in a stripping column with a partial reboiler. The feed \((\mathrm{F}=100 \mathrm{kmol} / \mathrm{h}, \mathrm{z}=0.65\) [mole fraction water], saturated vapor) is mixed with vapor leaving the top of the column, and the combined stream is sent to a total condenser and then to a liquid-liquid separator. The top layer from the liquid-liquid settler ( \(\mathrm{x} \alpha=\mathrm{x}_{\text {dist }}=57.3\) \(\mathrm{mol} \%\) water) is sent as a saturated liquid reflux to the distillation column. The bottom layer ( \(\mathrm{x} \beta=\mathrm{x}_{\text {dist }}=97.5 \mathrm{~mol} \%\) water) is the distillate product. CMO is valid, \(\mathrm{p}=1.0 \mathrm{~atm}\), reflux is a saturated liquid, boilup ratio \(\approx / \mathrm{B}=\) \(4, x_{\text {bot }}=2.0 \mathrm{~mol} \%\) water.

a. Find \(\mathrm{D}\) and \(\mathrm{B}\) in \(\mathrm{kmol} / \mathrm{h}\).

b. What is the reflux flow rate, \(\mathrm{kmol} / \mathrm{h}\) ?

c. How many stages are required? Step off stages from the top down.

d. What is the minimum value of the boilup ratio?