Answer to Question #224571 in Chemical Engineering for Toyo

Question #224571
One thousand kilograms per hour of a mixture of benzene (B) and Toluene (T) containing 60%
benzene by mass is separated by distillation into two fractions. The mass flowrate of the
benzene (B) in the top stream is 500 kg (B) /h and that of toluene in the bottom stream is 485 kg
(T) / h. The unit operates at steady state.
3.1.1. Draw a schematic diagram showing all the relevant streams in the distillation unit. (8)
3.1.2. Write the basis for calculation.
Expert's answer

Overall balance


Applying benzene balance

"(1000)(0.5)=D \\times D + B \\times B = 450 + B \\times B\\\\\nB \\times B =50"

This is the benzene flow rate at the bottom

Applying tolere balance

"(1000)(0.5)=D y D + B y B = DyD+475\\\\\nDyD= 25"

This is the tolere flow rate at the top

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