A packed column is used to absorb a toxic pollutant from a gas stream. From the data

given below, calculate the height of packing and column diameter. The unit operates

at $50\%$ of the flooding gas mass velocity, the actual liquid flow rate is $40\%$ more than

the minimum, and $95\%$ of the pollutant is to be collected. Employ the generalized

correlation provided in Figure $1$ to estimate the column diameter.

Gas mass flow rate $=3500l\frac{b}{h}$

Pollutant concentration in inlet gas stream $=1\mathrm{.}1$mol$\%$

Scrubbing liquid $=$ pure water

Packing type $=1-$inch Raschig rings; packing factor $F=160$

Hog of the column $2\mathrm{.}5ft$

Henry's law constant $m=0\mathrm{.}98$

Density of gas $($air$)0\mathrm{.}075l\frac{b}{f}{t}^3$

Density of water $62\mathrm{.}4l\frac{b}{f}{t}^3$

Viscosity of water $=1\mathrm{.}8cP$

Figure $1.$ Generalized pressure drop correlation to estimate column diameter.

Answer : D: $2\mathrm{.}43ft,$ Z: $17\mathrm{.}4ft$