. A distillation column with a total condenser is using open steam heating to separate ethanol from

water. Feed is 30 weights % ethanol and is at 20 oC. Distillate is a saturated liquid of 80 wt.%

ethanol. External reflux ratio is 1.15 times (L0/D) min. Bottom is 5 wt. % ethanol. Input steam is pure

water and is a saturated vapor. Pressure is 1 kg/cm2. Equilibrium data is given in Figure 2-4

(a) Find (L0/D) min and L0/D.

(b) Plot D and Plot B

(c) Use the Ponchon-Savarit analysis to determine the number of equilibrium stages and find

the optimum feed stage

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