Problem 3 An Absorber, packed to the height of 4.5 m, has been designed to reduce the concentration level of a mercaptan pollutant in an exhausted gas stream from 5 to 0.3 mole %. A nonvolatile, mercaptan-free solvent stream is fed to the top of the tower and flows counter current to the 0.236 m³/s of the exhausted gas stream. The solvent leaves the bottom of the tower containing 3.05 mole % mercaptan. At the pressure and temperature of the tower, 293 K, and 1.013X10³ Pa, the equilibrium data for the mercaptan-solvent system are as follows: mole-Mercaptan 0 0.01 0.02 0.03 0.04 X- mole-mercap tan- freesolvent mole-Mercaptan 0 0.0045 0.0145 0.0310 0.0545 mole-mercap tan-free-Air Determine the overall mass transfer capacity coefficient Kya by the use of the numerical or graphical integration and determine the diameter if the tower is packed with 1 inch Berl Saddles and the gas pressure drop within the packing is limited to 300 N/m³ of packing. The gas enters the tower with an average molecular weight of 180 and viscosity of 3 X 103 Pa.s and a specific gravity of 0.81.