Design a horizontal flash drum to separate $15,000$ kg$/$h of a feed with the following mass fractions: methane $0\mathrm{.}21,$ propane $0\mathrm{.}39,$ n$-$butane $0\mathrm{.}24,$ i$-$butane $0\mathrm{.}11,$ and n$-$pentane $0\mathrm{.}05.$ The feed is at $0\backslash$deg C and a pressure just high enough that it is all liquid. The drum pressure is $4\mathrm{.}0$ atm and the drum is adiabatic $($heat duty $=0).$

a$.$ Find the minimum feed pressure $($to within a whole number of atmospheres$)$ that keeps the feed

a liquid. Report this pressure and the VLE correlation used, and use this as the feed pressure for

the flash calculation.

b$.$ Find L$,$ V $($in kg$/$h and in kmol$/$h$),$ yi$,$ xi

$($in mole fractions$),$ and Tdrum $($in $\backslash$deg C$).$

c$.$ If the ratio of drum length to diameter, L$/$D $=4,$ find the length and diameter $($in meters$)$ of the

horizontal drum. without using aspen but excel maybe