In a wetted-wall tower where ammonia, NH 3 , is stripped from an ammonia-water solution into an air stream, the overall gas coefficient, K L is . At a plane in the tower, the bulk concentration of the...

In a wetted-wall tower where ammonia, NH₃, is stripped from an ammonia-water solution into an air stream, the overall gas coefficient, K_L
is
. At a plane in the tower, the bulk concentration of the falling aqueous stream is 4 kg mol/m³
of solution and the partial pressure of ammonia in the rising gas stream is 3.04
 10³
Pa. For dilute solutions of ammonia in water the equilibrium partial pressure may be evaluated by Henry’s law:

If the gas phase comprises 75% of the total resistance to mass transfer, calculate

a. the individual gas-film coefficient, k_G;

b. the individual liquid-film coefficient, k_L;

c. the overall liquid-film coefficient, K_L;

d. the interfacial concentrations, p_Ai
and c_Ai.