At a point in an ammonia absorber using water as the absorbent and operating at 101.3 kPa and 20°C, the bulk gas phase contains 10 vol% NH3. At the interface, the partial pressure of NH3 is 2.26 kPa. The concentration of the ammonia in the body of the liquid is 1 wt%. The rate of ammonia absorption at this point is 0.05 krnovh-m2.

(a) Given this information and the equilibrium curve in Figure, calculate X, Y, Yr, XI, X*, Y*, Ky, Kx, ky, and kx.

(b) What percent of the mass-transfer resistance is in each phase?

(c) Verify for these data that 1/Ky = l/ky +H'/kx.

Transcribed Image Text:

0.14 х, Y 0.12 Ү, X* Y, X1 0.10 F I Equilibrium 0.08 curve 0.06 | Yy, X1 Іx, у,! 0.04 0.02 х, у* 0.02 0.04 0.06 0.08 0.10 0.12 Moles NH3/mole H20, X Figure 6.49 Data for Exercise 6.32. Moles NH3/mole air, Y