1. A packed column is used to absorb a toxic pollutant from a gas stream at 25o and 760mmHG. Pollutant concentration in inlet gas stream is 1.1mol% and 95% of pollutant is to be collected. The actual liquid flow rate of the unit is 40% more than the minimum. The flow rate of gas to the column is 500kmol/h. The column will be packed with 50mm ceramic Berl saddles and the entering water is pollutant free. Calculate the diameter of column.

At the operating conditions equilibrium relationship of the system is given as y*=0,98x where x and y are mole fractions of solute pollutant in liquid and gas. At 20odensity of gas and water are 1,2kg/m3 and 1000kg/m3, viscosity of water is 18cP. And the molecular weight of gas and water is 29kg/kmol and 18kg/kmol