It is desired to remove 83.3% of dissolved NH₃from an aqueous stream containing 10.7 mole% NH₃in water using a packed tower in counter current flow at 1.0 atm and 30°C. The flow rate of this entering liquid stream is 2.0 kgmole/s. The inlet air stream contains no NH₃. Equilibrium distribution data for NH₃in water at 30°C is provided in the table below.
a. Plot out the equilibrium line in mole ratio coordinates, Y_Avs. X_A. What is the maximum possible mole fraction and mole ratio of NH₃in the outlet air stream, and the minimum possible air flow rate into the tower?
b. What is the operating air molar flow rate and mole faction of NH₃in the outlet gas at 1.5 times the minimum molar flow rate of air? Plot out the operating line in mole ratio coordinates. Is the operating line above or below the equilibrium line?

Equilibrium distribution data for NH₃-water at 30°C (A = NH₃):

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0.039 0.053 0.041 PA (atm) 0.032 0.020 0.025 0.017 0.021 0.026 0.031 XA PA (atm) 0.145 0.236 0.067 0.105 0.342 0.137 0.050 0.074 0.096 0.175 XA