Question: Question 4. A packed tower is to be designed to absorb NH3 from an air- NH3 mixture into pure water at 20C and 1 atm.

Question 4. A packed tower is to be designed to absorb

Question 4. A packed tower is to be designed to absorb NH3 from an air- NH3 mixture into pure water at 20C and 1 atm. The gas enters the tower with 25%NH3 (mole) and must leave at 1.5% NH3 (mole). Inert air flow rate is 250kg air/ hm2 and the concentration of solution leaving the bottom of the column is to be 15%NH3 (mole). (a) What is the minimum liquid rate? (b) What is the ratio of actual liquid rate to minimum at the bottom and the top of the column? (c) Assuming the film coefficients are kxa=1.25102kgmole/m3s and kya=3.2102 kgmole /m3s calculate the interphase concentrations at a point where x=0.15. (d) What are the values of Kx 'a and Ky 'a at x=0.15 ? (e) What are the percent contributions of the liquid and gas film mass transfer resistances to the total resistance? (f) What are the mass fluxes of gas and liquid at their maximum values in kmole/m2s ? (g) The mass fluxes are expressed with respect to which area, actual flow area or empty tower crossectional area

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