Using the attached ethanol/water Figure, calculate the theoretical stages needed to separate a 10 mole% ethanol liquid saturated feed into a 80 mole% distillate and a 0.1 mole% bottoms at 1 atmosphere pressure. The reflux ratio is 2 times the minimum reflux ratio. Use the modified book enthalpy method.
1. 11.7-1 but change the pressure to 2.0 atm
2. 11.7-3 but change the pressure to 3.0 atm