$3.$ A dilute aqueous solution of ethanol is to be concentrated from $20$ mass$\%$ to $85$ mass$\%$

alcohol in a tray tower at $1$atm pressure. The feed rate is $8000$ kg$/$h at its bubble point. The

bottom product must not contain more than $3\mathrm{.}5$ mass$\%$ ethanol. $($Hint: Use Ponchon$-$Savarit

method$)$

A$.$ Draw a sample tray tower. $($Understanding$)$

B$.$ Develop a step wise procedure for determining number stages required. $($Remembering$)$

C$.$ Construct Enthalpy and composition plot and find minimum reflux ratio. $($Applying$)$

D$.$ Determine number of ideal trays. $($Designing$)$