Design a carbon adsorption system for a dilute hexane stream in air with a flow rate of $5500$ acfm. You will need $110$ ft$3$ of carbon $(4\backslash$times $6$ mesh$),$ and the minimum bed depth must be $1$ ft$.$ Calculate the pressure drop across the bed for depths of $1\mathrm{.}0,1\mathrm{.}5,$ and $2\mathrm{.}0$ ft$.$