11.7-7. Shortcut Design Method for Distillation of Ternary Mixture. A liquid feed at its bubble point is to be distilled in a tray tower to produce the distillate and bottoms as follows. Feed, XAF = 0.047, XBF = 0.072, XCF = 0.881; distillate, XAD = 0.1260, XBD = 0.1913, xCD = 0.6827; bottoms, XAw = 0, = = 0.001, xcw ====== 0.999. Average a values to use are αд 4.19, αB = 1.58, ac 1.00. XBW ======== (a) For a feed rate of 100 mol/h, calculate D and W, number of stages at total reflux, and distribution (concentration) of A in the bottoms. (b) Calculate R, and the number of stages at 1.25Rm.