A flash drum is separating \(n\)-butane and \(n\)-pentane with \(T_{\text {drum }}=20.0^{\circ} \mathrm{C}\) and \(p_{\text {drum }}\) \(=101.3 \mathrm{kPa}\). The feed is \(50.0 \mathrm{wt} \% \mathrm{n}\)-butane and \(50.0 \mathrm{wt} \% \mathrm{n}\)-pentane. Use the Rachford-Rice equation to find V/F (does not require trial-and-error). Then find \(\mathrm{x}\) and \(\mathrm{y}\) for \(\mathrm{n}\)-butane and n-pentane. Use DePriester charts or Eq. (2-28).
Is it possible to do a flash distillation of the \(50-50\) feed of \(n\)-butane and \(n\) pentane with the flash drum operated at \(\mathrm{T}_{\text {drum }}=0.0^{\circ} \mathrm{C}\) and \(\mathrm{p}_{\text {drum }}=101.3 \mathrm{kPa}\) ?

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In K = a/T + a2/T + a + a In p + a2/p + a apl p3/p