QUESTION $1$

A tray tower is to be designed to absorb $S{O}_2$ from an air stream by using fresh water at $293K.$ The entering gas contains $20$ mol$\%S{O}_2$ and that leaving the column should have $2$mol$\%SO2$ at a total pressure of $101\mathrm{.}3$kPa. The inert air flow rate is $150kg$ air$/$h$.$m $2$ and the entering water flow rate is $6000kg$ water$/$h$.$m$2.$

$($a$)$ Draw the schematic diagram of the process. $($Assume the top tray is Tray $1).$

$($b$)$ The equilibrium data is given in the Table below. Convert the data into the solute free basis $(x$ and $Y).$

$($c$)$ What is the minimum flowrate $L_{\text{m}\text{i}\text{n}}?$

$($d$)$ Plot the operating line and the equilibrium line based on the solute free basis.

$($e$)$ Determine the total number of tray required.

$($f$)$ Use the Kremser method to calculate the number of tray and compare the results.

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