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A mass transfer tower operating at 1 atm and 300 K uses water, which enters free of ammonia at the top, to reduce the ammonia (NH3) concentration in air exhausted from a reactor. At one plane (W) in the tower, the concentrations of ammonia in the liquid phase and at the interface are 35.2 mol/m3 and 41.5 mol/m3 respectively. The individual gas mass transfer coefficient is 1.1 mol/(m2 s ), and 20% of the resistance to mass transfer is in the gas phase. At 300 K, the Henry’s constant is 150 atm and water density is 998 kg/m3 . .
A. Interfacial and bulk pressure of ammonia in the gas at plane W (PAi, PAG).
B. Individual gas and liquid mass transfer coefficients (kg, kL)
C. Overall gas and liquid mass transfer coefficients (Kg, KL)
D. Molar flux (NA)
Water at 40 °F flows through the coils of the heat exchanger as shown in Fig. P8.81 at a rate of 0.9 gal/min. Determine the pressure drop between the inlet and outlet of the
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