Murphree efficiency and actual number oftrays. for the distillation of heptane and ethyl benzene in problem 26.4-2, the murphree tray efficiency is estimated as o.55. determine the actual number of trays needed by stepping off the trays using the tray efficiency of o.55. also, calculate the overall tray efficiency eq 26.4-2. rectification ofa heptane-ethyl benzene mixture. a saturated liquid feed of 200 mol/h at the boiling point containing 42 mol % heptane and 58% ethyl benzene is to be fractionated at 101.32 kpa abs to give a distillate containing 97 mol % heptane and a bottoms containing 1.1 mol % heptane. the reflux ratio used is 2.5: 1. calculate the mol/h distillate, mol/h bottoms, theoretical number of trays, and the feed tray number. equilibrium data are given below at 101.32 kpa abs pressure for the mole fraction n-heptane xh and yh: temperature temperature 409.3 402.6 392.6 136.1 129.40.08 119.40.250 383.8 376.0 371.5 oc 110.6 102.8 0.485 0.790 1.000 0.730 0.904 1.000 0 0 0.230 0.514 98.3 ans. d 85.3 mol/h, w 114.7 mol/h, 9.5 trays reboiler, feed on tray 6 from top