Problem 1. A distillation column is used to separate a mixture of 40 mol% carbon disulfide (CS2) in carbon tetrachloride (CC14). The feed is 50% vaporized (q=0.5), the product from the total condenser is 95% of the light key, and the bottoms from the partial reboiler is 95% heavy key. The column operates with a reflux ratio of 4 to 1. The Murphree vapor efficiency is 80%. (a) Calculate graphically the minimum reflux, the minimum boilup ratio from the reboiler, and the minimum number of theoretical stages (including the reboiler). (b) How many trays are required for the actual column with 80% efficiency by the McCabe-Thiele method? VLE data for the binary mixture at column pressure (mole fractions of CS2): X 0.05 0.135 0.10 0.245 0.20 0.42 0.30 0.545 0.40 0.64 0.50 0.725 0.60 0.79 0.70 0.85 0.80 0.905 0.90 0.955