b$)$ A packed tower with $0\mathrm{.}025m$ berl saddles packing is used to reduce $95\%$ of ammonia

from a $6$mol$\%$ ammonia contaminated air stream. The column is to be operated at $20C$

and $101\mathrm{.}325$kPa. The total gas flow rate is $100$kgmo$\frac{l}{h}.$ A total of $300$kgmo$\frac{l}{h}$ of

ammonia free water is used as absorbent$.$ Determine:

i$.$ The flow rate of raffinate and extract.

$(5$ marks$)$

ii$.$ The mass velocity of the gas if the pressure drop of the column is $400\frac{\frac{N}{m}2}{(m)}.$ The

Generalized correlation for pressure drop in packed columns diagram is given in

Appendix $2.$ Attach the Appendix $2$ with the answer booklet.

$(7$ marks$)$

iii. The diameter of the tower.

Data given:

Packing factor of $0\mathrm{.}025m$ berl saddles $=361m$

Gas constant, $R=8\mathrm{.}314m^3.P\frac{a}{m}ol.K$

Density water at $20C=998\mathrm{.}23k\frac{g}{m^3}$

Viscosity water at $20C=1\mathrm{.}005{10}^{-3}k\frac{g}{m}.s$

Molecular weight air $=28\mathrm{.}97\frac{g}{m}ol$

Molecular weight ammonia $=17\frac{g}{m}$olhelp