Question: A packed absorption tower is used to remove $mathrm{SO}_{2}$ from an air stream by absorption in a solvent. The tower is $5 mathrm{ft}$. in diameter

A packed absorption tower is used to remove $\mathrm{SO}_{2}$ from an air stream by absorption in a solvent. The tower is $5 \mathrm{ft}$. in diameter and $60 \mathrm{ft}$. high and contains 1.5 in. plastic Pall rings. The temperature and pressure in the tower are $90^{\circ} \mathrm{F}$ and $30 \mathrm{psig}$. The gas stream flow rate is $6500 \mathrm{scfm}$, and the liquid $\mathrm{SG}$ is 1.25 , with a viscosity of $25 \mathrm{cP}$.

(a) What is the liquid flow rate (in gpm) at which the column will flood?

(b) If the column operates at a liquid rate that is $75 %$ of the flooding value, what is the total pressure drop through the tower in psi?

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