a exhaust stream contains $1880$ppm of n$-$pentane at $95$F$.$ the flow rate to be treated is $5500$acfm. carbon capacity is $3\mathrm{.}5$ lb n$-$pentane $/100$lb AC$.$ carbon density is $30$ lb$/$ft$3.2$bed system : $1$hr for adsorption and the other hr for regeneration. Mass flow rate of n$-$pentane? flow velocity? stream requirement? pressure drop?