It is required to remove $99\%$ of the solute $C$

from a solution of $C$ in gas phase by using pure

solvent in a counter current cascade. The feed

containing $12\%$ in the mixture enters the column

at the bottom at the rate of $6000\frac{kg}{hr}.$ The solvent

enters the top at the rate of $7685\frac{kg}{hr}.$ Write the

equation of operating line. Determine the number

of trays required to perform the seperation if the

overall tray efficiency is $40\%.$ The equilibrium

relation is linear, $Y=1\mathrm{.}32x$ where $Y=kgC$ per $kgC$ freegas

or mole ratio of $C$ in gas and X is mole ratio in

liquid.