$10-28$ and $10-29,$ estimate the HETP and Cs $($capacity factor at flood$)$ for #$2\mathrm{.}5$ nutter ring as packing. Use $75\%$ of estimated flooding velocity to compute the column diameter.

D$14.$ a$.$ We are distilling methanol and water in a column packed with $1-$in$.$ ceramic Berl saddles. The bottoms composition is $0\mathrm{.}01$mol$\%$ methanol. The column operates at $1\mathrm{.}0$atm pressure. The feed to the column is a saturated liquid at $1000\mathrm{.}0$kmo$\frac{l}{?}$ day and is $40\mathrm{.}0$mol$\%$ methanol. $\frac{L}{D}=2\mathrm{.}0.$ The distillate product is $99\mathrm{.}8$mol$\%$ methanol. If we will operate at a vapor flow rate that is $80\mathrm{.}0\%$ of flooding, calculate the diameter based on conditions at the bottom of the columo. Data are available in Tables $2-7$ and $10-3.$ Vapor is an ideal gas. Viscosity of water at $100\mathrm{.}0C$ is $0\mathrm{.}26cP.$

Problem $10$D$15,$ page $429.$

D$15.$ Repeat Problem $10.$D$14$a$,$ except determine the diameter of a sieve plate column operating at $80\mathrm{.}0\%$ of flooding velocity. Use a $0\mathrm{.}3048-m$ tray spacing and $=0\mathrm{.}85.$ The liquid surface tension of pure water is $=58\mathrm{.}9$dyne$\frac{s}{c}m$ at $100\mathrm{.}0C.$

ONLY ANSWER D$15,$ NO NEED TO DO D$14$