D$11.*$ We wish to distill an ethanol$-$water mixture to produce $2250lb$ of distillate product per day. The

distillate product is $80$mol$\%$ ethanol and $20$mol$\%$ water. An L$/$D of $2\mathrm{.}0$ is to be used. The

column operates at $1$atm. A packed column will use $5/8-$inch plastic Pall rings. Calculate the

diameter at the top of the column.

Physical properties: $M{W}_E=46,M{W}_W=18,$ assume ideal gas, ${}_L=0\mathrm{.}52cP$ at $176F,{}_L=0\mathrm{.}82$

$\frac{g}{m}l.$

a$.$ Operation is at $75\%$ of flooding. What diameter is required?

b$.$ Operation is at a pressure drop of $0\mathrm{.}25$ inches of water per foot of packing. What diameter is

required?

c$.$ Repeat part a but for a feed that is $22,500$ lb of distillate product per day. Note: It is notnecessary to redo the entire calculation, since D and hence V and hence diameter are related tothe feed rate.