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Ammonia, N H 3 , is being selectively removed from an air - N H 3 mixture by absorption into water. In this steady -
Ammonia, is being selectively removed from an air mixture
by absorption into water. In this steadystate process, ammonia is transferred
by molecular diffusion through a stagnant gas layer thick and then
through a stagnant water layer thick. The concentration of ammonia
at the outer boundary of the gas layer is mol and the concentration at
the lower boundary of the water layer is essentially zero.
The temperature of the system is and the total pressure is atm.
The diffusivity of ammonia in air under these conditions is and in
liquid water is Neglecting water evaporation, determine the
rate of diffusion of ammonia, in Assume that the gas and liquid are
in equilibrium at the interface.
The equilibrium data for ammonia over very dilute aqueous solution at
and atm can be represented by Welty et al
Hint: At steadystate, the
ammonia rate of diffusion
through the gas layer
must equal the rate of dif
fusion through the liquid
layer.
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