Question $3$:

Methanol containing aqueous mixture having $45$mol$\%C{H}_{3}OH$ is to be separated into a top product

having $96$mol$\%$ methanol and a bottom liquid with $4\%$ methanol in a distillation unit. The feed is at its

bubble point and the operating pressure is $101\mathrm{.}3$kPa. A reflux ratio of $1\mathrm{.}5$ is suggested. Determine the

number of ideal trays using McCabe$-$Thiele method.

The equilibrium data for methanol$-$water system at $101\mathrm{.}3$kPa are given below. $[$Use a graphic paper$]$