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Distillation Column Design : McCabe – Thiele Method
A mixture of benzene and toluene containing 50 mole % benzene is to be separated to give a product of 95 mole % benzene and a bottom product containing 10 mole % benzene. The feed enters a column at its bubble point. It is proposed to operate the column with reflux ratio of 2.5. It is required to find the number of theoretical plates needed and the position of feed plate. The equilibrium data for the system is given below:

 x y

0 0

0.1 0.217

0.2 0.385

0.3 0.52

0.4 0.62

0.5 0.714

0.6 0.79

0.7 0.85

0.8 0.91

0.9 0.96

1 1

x is mole fraction of benzene in liquid phase

y is mole fraction of benzene in vapor phase





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