In HDA process a column separating $H_6,C{H}_4$ from Beazene. Column feed is $400mo\frac{l}{h}r$ and mole fraction $x_{n2}=0\mathrm{.}0055$;$x_{Chs}-0\mathrm{.}0324$;$x_{\text{t}\text{e}\text{r}}=0\mathrm{.}961$;$x_{\text{t}\text{a}\text{r}}=0\mathrm{.}0011$; Assume $99\mathrm{.}85\%$ recovery of benzene trom feed at the bottom of the columa and $100\%$ recovery of $H_2$ and CHs at columin overbead. MeS index $800.$ Textbook $2$ for additional information.

a$.$ Estimate the annual loss of benzepe if Equilibrium value of Benzene $K_{\text{s}\text{e}\text{m}\text{e}}-0\mathrm{.}03$ by assuming liquid in the reflux drum if pure benzene, benzene price is $10\frac{s}{m}ol$ and designed for $8000h\frac{r}{y}$ear

$4$

b$.$ Estimate the column overiead vapor distillate flow $($D$),$ Liquid flow $($L$)$ and vapor $($y$),$ liquid $($x$)$ composition if the value of equilibrium $K_s-550,K_{CH}-240$ and $K=en=0\mathrm{.}04.$

c$.$ Estimate the annual cost of the column by assuming following.

Felsthe volstility is $72$; Reflux ratio $R-2R$ ma; $=0,3$;$H_6=20f$ for column top and bottom space. $M{M}_0=78$;$Tb=400$ oF and $P=150$ psia.

$20$

d$.$ Calculate the Economic potential, if condenser and reboiler area $50I^2$ and $40f^2$ respectively. Cooling water available at $0\mathrm{.}06$$$1000$gat,$T=30\%$ and $Q-$ns$3038$ Btu hr$.$ Steam available at $2\frac{\text{\$}}{10001}lb$ and Qreboiler $=17\mathrm{.}2Bt\frac{u}{h}r,$ assume no purge losses.

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