5-B. A distillation column is to be devigned to separate menhanol and water continuously. The food coatains 40 motis of methasol and 60 molis of water and is saturated liquid. The column presure will be 101.3kPa(1atm). for which the following bikary equilibrium data are: Methanol at equilibrium, mol \%/ (data from Perry and Chilton, 1973) The foed is to be introduced at the optimal location for minimum stagn: 95 percent of the methanol in to be recovered in a liquid distillate centaining os mol \% methanot. The raflus is to be saturated liquid with a fow rate 1.25 times the minimum reflus rate which woeld correspend to infinite sagen. Assming constant molal overflow, find the number of equilibrium stages mquired in the column