You wish to distill $2000kg$ moles $\frac{?}{hr}$ of a saturated liquid feed. The feed is $0\mathrm{.}056$ mole fraction propane, $0\mathrm{.}321n-$butane, $0\mathrm{.}482n-$pentane, and the remainder $n-$hexane. The column operates at $101\mathrm{.}3$kPa. The column has a total condenser and a partial reboiler. The reflux ratio is $3\mathrm{.}5$ and is a saturated liquid. $99\mathrm{.}4\%$ recovery of propane

is desired in the distillate and $99\mathrm{.}7\%$ n$-$butane in the bottoms.

$2\mathrm{.}1$ Draw a column and label with your knowns.

$2\mathrm{.}2$ Use the DePriester chart to find the order of volatilities and define the light key, heavy key, and non$-$key$($s$).$

$2\mathrm{.}3$ Write all possible equations and list unknowns $($degree of freedom analysis$).$

$2\mathrm{.}4$ Find the flow rates for $D$ and $B,$ and the molar composition of $D$ and $B.$