Example 3.8: A rectification column is fed 100 kg mol/h of a mixture of 50 mol % benzene and 50 mol % toluene at 101.32 kPa abs pressure. The feed is saturated vapor at the dew point.. The distillate...

Extracted text: Example 3.8: A rectification column is fed 100 kg mol/h of a mixture of 50 mol % benzene and 50 mol % toluene at 101.32 kPa abs pressure. The feed is saturated vapor at the dew point.. The distillate is to contain 90 mol % benzene and the bottoms 10 mol % benzene. Calculate the following. (a) Minimum reflux ratio Rm,. (b) Minimum number of theoretical plates at total reflux. (c) Theoretical number of trays at an operating reflux ratio of 1.5(Rm) Solution Xd = 0.31, Rm = 1.9, R = 1.5 Rm = 2.85 Rm+1 q-Line 1. (Xf, Xf) = (0.5 , 0.5) 2. q = 0 (horizontal) TOL 1) (xd , xd ) = (0.9 , 0.9) Xd 0.9 2) = 0.23 R+1 2.85+1 BOL 1. (Xw, Xw) = ( 0.1 , 0.1) 2. Intersection of TOL and q-line Number of stage = 7.8 , Number of plates = 6.8 and feed is introduced on tray 5 from top.