A liquid mixture containing $40$ mol$\%$ cyclohexane $(C_6{H}_{12})$ and $60$ mol$\%$ cyclopentane $(C_5{H}_{10})$

enters a distillation column at a flow rate of $100mo\frac{l}{s},$ and $50C.$ The overhead gas product

contains $30mo\frac{l}{s}$ cyclohexane and the balance cyclopentane while the bottom liquid product

contains $50mo\frac{l}{s}$ cyclopentane. Both the vapour and liquid products leave the column at

$70C.$

a$)$ Solve material balance of the system. Identify enthalpy of each component in the inlet

and outlet streams.

$(9$ marks$)$

b$)$ Take cyclohexane and cyclopentane in liquid phase, $25C,$ and $1$atm as the reference

state. Calculate the required heat for the process in $k\frac{J}{s}.$

Ans: $1715k\frac{J}{s}$

$(12$ marks$)$