BOG
23323
3
Obaze ukpos, GLONT
PLACE
253230221
CLASS WORK
(Minimum liquid rate for absorption) A packed tower is to be designed for the absorption of 98% of the ammonia(A) from an air-ammonia mixture containing 4% ammonia at a rate of 4200 NmÂł (normal cubic metre) per hour using water as the solvent. The tower operates at 105.1 kPa and 303 K. The equilibrium data for NH3-water system at 303 K [Sherwood, T.K., Ind. Eng. Chem., 17(1925) 745] are given below:
Partial pressure of NH3 (mm Hg)
19.3
2
29.6
3
40.1
4
51.0
5
79.5
110
kg NH3 per 100 kg water
4 (a) Calculate and plot the equilibrium data as XA VS. PA, XA VS. YA and XA vs. YA. Up to what value of PNH3 can the Henry's law be used to describe the equilibrium?
7.5
10
(b) Calculate the minimum liquid rate for the absorption (the inlet water is NH3-free).
PA
193
9/30/2021 12:43 PM
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