Drawing the McCabe-Thiele graph as y_MVC vs. x_MVC is traditional but not necessary. Repeat Example 4-3, but plot y_w vs. x_w for the McCabe-Thiele diagram. Note the differences in the diagram. Do you expect to get the same answer?

Data From Example 4-3

A distillation column with a total condenser and a partial reboiler is separating an ethanol-water mixture. Feed is 20 mol% ethanol, feed rate is 1000 kmol/h, and feed temperature is 80°F. Distillate is 80 mol% ethanol, and bottoms is 2 mol% ethanol. External reflux ratio is 5/3. Reflux is a saturated liquid, and CMO can be assumed. Pressure is 1 atm. Find optimum feed plate location as stages above the reboiler and total number of equilibrium stages.