The Murphree plate efficiency for the ammonia stripper of Problem 5.3 is constant at \(53.5 \%\). Estimate the number of real trays required.

Data From Problem 5.3:-

A tray tower providing six equilibrium stages is used for stripping ammonia from a wastewater stream by means of countercurrent air at \(1 \mathrm{~atm}\) and \(300 \mathrm{~K}\). Calculate the concentration of ammonia in the exit water if the inlet liquid concentration is 0.1 mole \(\%\) ammonia, the inlet air is free of ammonia, and 1.873 standard cubic meter of air are fed to the tower per kilogram of wastewater. The equilibrium data for this system, in this range of concentrations and \(300 \mathrm{~K}\), can be represented by \(y_{A, i}=1.414 x_{A, i}\) (King, 1971).