n-pentane / n-heptane Separation. A saturated liquid feed of 600 mol/hr containing 46 mole % n-pentane is to be fractionated at 101.325kPa (abs) in order to form a distillate containing 96 mole % n-pentane and a bottoms product of 10 mole % n-pentane. Assume Raoult's Law behavior applies (some calculated results provided). The distillate reflux ratio to be used is 4:1. a) Calculate the flowrates (mol/hr) of the distillate and bottoms. b) Determine the minimum reflux ratio, Rain and the minimum number of theoretical trays at total reflux. c) Determine the theoretical number of trays and the feed tray number for the specified operational design. d) If each stage in the column is 75% efficient how many actual stages will be required? Use modified equilibrium values: for stage-wise efficiency one option is corrected y mole fractions (keep the 1.0 and 0.0 values) defined by the following relationship: Efficiency Vefs = Videal - Videal Xideal) x (1 100 e) Determine the minimum reflux ratio, Rmin for the system defined in part (d) f) If the column is simply 75% efficient overall how many stages will be required? (Simply correct overall ideal column stages by efficiency, e.g. Nactual=Nideal. - ! ! Efficiency 80% Y 1.000 1 Temperature T(F) T(K) 97.0 309.2 109.4 316.1 121.9 323.1 134.4 330.0 146.9 336.9 159.4 343.9 171.8 350.8 184.3 357.7 196.8 364.7 209.3 371.6 T(C) 36.1 43.0 49.9 56.9 63.8 70.7 77.7 84.6 91.5 98.5 Vapor Pressure n-pentane n-heptane kPa kPa 101.369 10.354 127.7 14.085 159.1 18.855 196.1 24.870 239.3 32.357 289.5 41.568 347.2 52.774 413.1 66.269 487.9 82.367 572.3 101.400 1.000 0.768 0.588 0.447 0.333 0.241 0.165 0.101 0.047 0.000 0.968 0.923 0.864 0.787 0.689 0.565 0.412 0.226 0.000 y@80% 1.000 0.928 0.856 0.781 0.696 0.599 0.485 0.350 0.190 0.000