Question

In an experimental study of the absorption of NH3 by water in a wetted-wall column, the value of KG was found to be 0.205 lbmole NH3/hr.ft2.atm. At one point in the column, the gas contained 8 mole percent NH3 and the liquid phase concentration was 0.004 lbmole of NH3 per ft3 of solution. The temperature was 68 oF, and the total pressure was two atmospheres. Eighty-five percent of the total resistance to the mass transfer was found to be in the gas phase. The equilibrium relation is given by

yAi = 0.372 xAi

where yAi is the gas phase mole fraction of NH3 and xAi is the equilibrium mole fraction of NH3 in water. Calculate

(a)the individual film coefficients, ky, kx.

(b)the interfacial compositions, yAi, xAi.

Answer 1