$($c$)$ A tray tower is to be designed to absorb $C{O}_2$ from a flue gas stream by scrubbing into an

aqueous amine solution at $25C.$ Approximately, $180\frac{m^3}{h}($at $25C$ and $1$atm $)$ of gas is to be

processed and the $C{O}_2$ content of the gas is to be reduced from $15$mol$\%$ to $2$mol$\%.$ The

scrubbing liquid, which is recycled from a stripper, will contain $0\mathrm{.}058$molC$\frac{O_2}{m}ol$ solution.

Determine $($i$)$ the minimum liquid rate, kmo$\frac{l}{h}$ and $($ii$)$ the number of real trays required for a

liquid rate $1\mathrm{.}2$ times the minimum. Assume an overall tray efficiency of $53\%.$

Equilibrium Data: