A two$-$bed carbon adsorption system shown below is to be designed to handle $8,000$ acfm of

air containing $700$ ppm of hexane. Laboratory studies indicate that carbon can adsorb $8$ lb

hexane per $100$ lb carbon under the conditions at which the system will be operated.

a$)$ If the system is to operate at $90\backslash$deg F and $1\mathrm{.}0$ atm at a removal efficiency of $99\%,$ determine

the approximate dimensions of each carbon bed. Bed regeneration and cooling will

require one hour.

b$)$ Estimate the total amount of steam required per day $($in pounds$)$ to regenerate the beds

of the system.