Question

Distillation- McCabe-Thiele

A saturated vapor feed (pure vapor at the dew point) containing 52 mol% toluene and 48 mol% n-octane is to be fractionated at 101.3 kPa abs. to give a distillate containing 95 mol% toluene at 10 kmol/hr and a bottoms containing 5 mol% toluene. Use McCabe-Thiele graphical method to answer the following questions:

a) Draw a vapor-liquid equilibrium diagram. Do this in excel and use gridlines to produce a nice figure that you can use for the rest of the steps. (Note: you should already have this from HW#04.)

b) Calculate the flowrates of the feed and bottoms.

c) Determine the minimum reflux ratio (Rmin).

d) Using R = 1.5 Rmin, determine the theoretical number of trays required. (Remember the reboiler) e) Using R = 1.5 Rmin, determine the feed tray number. (Remember the rule for the feed location)

Answer 1

in given problem , equlibirium relation is not given, without it we can not find Rmin and theoretical number of trays required.