Question

1. A wetted-wall absorption tower, 1 in ID is fed with water as the wall liquid on ammonia-air mixtures as the central-core gas. At a particular level in the tower, the ammonia concentration in the bulk gas is 0.8 mole fraction, that in the bulk liquid 0.05 mole fraction. The temperature is 80 ℉, and pressure is 1 std atm. The rates of flow are such that the local mass-transfer coefficient in the liquid, from a correlation obtained with dilute solution is k_L= 0.0391 m/s. For the gas phase, diffusivity of ammonia as D_A = 0.890 ft^2/hr, F_G . = 1.471× 10−3 kmole/m^2. , and Sh = 40. Considering that an equilibrium exist between gas and liquid ( x_Ai= 0.250 and y_Ai= 0.585) and = N_AG=3.17 × 10−4 kmole/ m^2. ,compute a percentage of resistance exposed by each individual gas and liquid phase.

Answer 1

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