D30.* A distillation column is separating methanol from water. The column has a total condenser that subcools the reflux so that 1 mole of vapor is condensed in the column for each 3 moles of reflux. L0/D=3. A liquid side stream is withdrawn from the second stage below the condenser. This side stream is vaporized to a saturated vapor and then mixed with the feed and input on stage 4 . The side withdrawal rate is S=500kmol/h. The feed is a saturated vapor that is 48mol% methanol. Feed rate is F=1000kmol/h. A total reboiler is used, which produces a saturated vapor boilup. We desire a distillate 92mol% methanol and a bottoms 4mol% methanol. Assume CMO. Equilibrium data are given in Table 2-7. Find: a. The total number of equilibrium stages required. b. The value of v/B