• The following data are obtained for binary distillation of the benzene/toluene system on a 250 mm packed height distillation column at 1 atm under total reflux conditions. Concentration of the top liquid: xD = 0.66 Concentration of the bottom liquid: xB = 0.01 Calculate the liquid concentration at the top of the column for the same bottom concentration and under the same operating conditions if the packed height is increased to 650 mm.