Problem 4. The feed is 60 mol% methanol and 40 mol % water and is input as a two-phase mixture that flashes so that Ve/F=0.3. Feed flow rate is 350 kmol/hr. The column is well insulated and has a total condenser. The reflux ratio is 3. We desire a distillate concentration of 95 mol% methanol and a bottoms concentration of 8 mol% methanol. Instead of using a reboiler, saturated steam at 1 atm is sparged directly into the bottom of the column to provide boil-up (i.e. open steam process). Column pressure is 1 atm. Use the given phase equilibrium. Determine: 4.1. Total required equilibrium stages. 4.2. Optimal location for the feed stage. 1 0.9 0.8 0.7 0.6 y MeOH 0.5 0.4 0.3 0.2 0.1 0 0 0.8 1 0.9 0.6 0.4 0.2 0.1 0.7 0.3 0.5 x MeOH