An industry decides to increase its production rate by installing an additional distillation

unit to separate a mixturb of ethanol and water. The distillation unit is fed with the mixture

containing $20\%$ ethanol $($E$)$ by mass at a flow rate of $20000k\frac{g}{h}r.$ From the distillation

unit, an overhead stream of $90\%E$ is produced. Meanwhile the stream at the bottom of

the column contains $98\%$ water $($W$).$

$2\mathrm{.}1$ Draw and completely label the process.

$2\mathrm{.}2$ Calculate the degree of freedom.

$2\mathrm{.}3$ Determine the overhead flow rate and the mass flow rates of ethanol and water in the

bottom stream.

$2\mathrm{.}4$ If the stream to the distillation unit was increased to $24000k\frac{g}{h}r,$ what would be the

new overhead flow rate and the mass flow rates of ethanol and water in the bottom

stream.

THE END

TOTAL MARKS $=50$