Question: A tower operating at 1 atm is to be designed to distill 200 kmoles/h (55.6 moles/s) of a binary mixture of 60 mole% benzene and

A tower operating at 1 atm is to be designed to distill 200 kmoles/h (55.6 moles/s) of a binary mixture of 60 mole% benzene and 40 mole% toluene. A liquid distillate and a liquid bottoms product of 95 mole % and 5 mole % benzene respectively are to be produced. Before entering the column the feed is flash vaporized at 1 atm to produce an equimolal vapor/liquid mixture (Vf/F = Lf/F = 0.5). A reflux ratio 30% above the minimum is specified.

a. What is the minimum number of theoretical stages?

b. What is the minimum reflux ratio?

c. If the actual reflux ratio is 1.3Rmin then what is the number of equilibrium stages required?

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