Question $3$

$[21]$

An absorber is to be designed for $98\%HCl$ removal from a process offgas, initially containing $12\%HCl$ by volume. $HCl-$free water at $293K$ and $1\mathrm{.}013{10}^{5}Pa$ pressure will be fed at a rate of $2\mathrm{.}62k\frac{g}{m}in$ to the top of a packed, $0\mathrm{.}6-m$ diameter column, flowing countercurrent to the rising gas stream. $5\frac{m^3}{m}in$ of process off$-$gas, measured at $293K$ and $1\mathrm{.}013{10}^5$ Pa pressure, are blown into the tower, over $20mm$ ceramic Hiflow ring $4$stg$,$ packing. Assuming that at the given conditions the system operates at the loading region calculate the pressure drop per unit height of packing.

Given

The average inlet gas molecular weight is $41\mathrm{.}972$ and viscosity of $15{10}^{-6}Pa.s$ The viscosity of water is $1\mathrm{.}0043cP$