mixture of benzene and toluene must be separated using a distillation column with the benzene purity at the top of the column as 92 % and bottom as 5%. The 250 kmol/h saturated liquid feed contains 55 mole% of benzene. The reflux is a saturated liquid and a reflux ratio of 1.9 is maintained. Estimate the distillate, bottom rate, minimum and actual number of stages required to obtain the desired purity. The vapor liquid equilibrium data at operating pressure of 101.3 kPa are given below. x0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 y 0 0.21 | 0.38 | 0.511 | 0.627 0.719 | 0.79 | 0.853 0.91 | 0.961 | 1.0

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