A side-stream of a plant contains 15% mole dissolved ammonia in water and should be treated to reach to 5% molar using fresh air at 1.1 atm and 25C. There is a contact stripper available with 8 stages. Regardless of hydrodynamie capacity and limited mass transfer coefficients, determine the required air for this process (m/hr), if the overall efficieney of the stripper is 50% (No. of ideal stages / No. of real stages) Aqueous phase flow = 10 m/hr Aqueous phases density 995 kg/m Assume isothermal process at 25C and 1.1 atm. Neglect the hydrodynamic capacity of the tower. Vapor-liquid equilibrium data for ammonia/water system at 25C and 1.1 atm are given as below based on ammonia mole fraction: 0.055 0.06 0,08 0.1 0.1 0,15 0.11 0.18 0,14 03 0,16 0.4 0,17 0,45