An air stream flowing at 1500 kmol/h containing benzene vapor is to be scrubbed in a packed bed using 1-in, ceramic Berl saddles using 250 kmol/h of hexadecane as the solvent. The mole fraction of benzene in the inlet air is 0.01, and the required outlet mole fraction is 0.0005. The hexadecane is being returned to the scrubber from a stripper, so the inlet mole faction of benzene in hexadecane is 0.0001. The column may be assumed to operate at 150 kPa and 35°C. Raoult’s law may be assumed to define the benzene equilibrium.

1. Determine the diameter of the packed column for 75% of flooding.
2. Determine the pressure drop per unit height in the column.

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Data provided: Benzene Hexadecane A 6.90565 Antoine Coefficients B 1211.033 C 220.79 SG 0.770 H(cP) 3.4