Rectification of a 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 h and yh: