Determine partial pressure of nh3 at gas liquid interface

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Reference no: EM131310679

Ammonia, NH₃, in air is being absorbed into water within the enclosed tank shown in the figure below. The liquid and gas phases are both well mixed, and mass transfer occurs only at the exposed gas-liquid interface. The diameter of the cylindrical tank is 4 m, total liquid volume inside the tank is constant.

1191_Figure 03.jpg

The bulk gas pressure of ammonia is maintained at 0.02 atm, and the total gas pressure is constant at 1.0 atm. The system is isothermal at 20°C. The inlet volumetric flow rate of water is 200 L/h and enters NH³ free. You may assume that Henry's law, p_Ai = Hc_Ai describes the equilibrium distribution of NH₃between the gas and the liquid phases where H = 0:02 atm/(kg mol/m³). The film mass-transfer coefficients are k_G = 1:25 kg mol/m² h atm and k_L = 0:05 kg mol/m² h (kg mol/m³).

a. Determine the overall mass transfer coefficient, K_G.

b. Determine the partial pressure of NH₃ at the gas-liquid interface, p_Ai.

c. Determine W_A the total molar rate of ammonia transfer.

d. Develop a material balance for NH₃; then determine c_Ai the concentration of NH₃ in the outlet liquid stream.

Reference no: EM131310679

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