Sulphur dioxide is absorbed in a packed bed absorption tower with 25 mm ceramic Intalox saddles (packing factor of 300 m) using water solvent in a countercurrent arrangement. The feed gas contains 0.05 kmol SO-/kmol air, and it is desired to reduce the SO, content of exit gas to 3% of its inlet concentration. The gas flow rate is 0.067 kmol's of air, and the water rate is 3,08 kmol/s. The equilibrium relation is given by: Y= 30 X. Calculate: (a) number of transfer units; (b) column diameter, (c) the height of the packing. Assuming the entire process is gas-film controlled. Design for a pressure drop of 21 mm H-O/m packing. P = 1.21 kg/m: p = 1000 kg/m³: д, = 0.018×10-3 N.s/m² = 10³ N./m²; D₁ =1.45x10 m³/s; D₁ = 1.7x10m²/s. H=0.011, (Sc)( 0.305 111 De 2 3.05) 035 H₁ = 0.305 (Sc) K (305)