A two$-$phase feed to the gas$-$liquid separator $($or flash

drum$),$ shown in Fig. E$13\mathrm{.}10,$ consists of a mixture of two

hydrocarbons. Because the vessel pressure P is lower than the

feed pressure, the feed flashes as it enters the separator. Using

the following information and a degrees of freedom analysis,

do the following:

$($a$)$ Determine the model degrees of freedom, NF$.$

$($b$)$ Determine the control degrees of freedom, NFC$.$

$($c$)$ Specify reasonable CVs and MVs$.$ Justify your answers