Absorption of Ammonia in a Tray Tower. A tray tower is to be used to remove 99% of the ammonia from an entering air stream containing 6 mol % ammonia at 293 K and 1.013 x 105 Pa. The entering pure water flow rate is 188 kg H₂O/h m² and the inert air flow is 128 kg air/h m². Calculate the number of theoretical trays needed. Use equilibrium data from Appendix A.3. For the dilute end of the tower, plot an expanded diagram to step off the number of trays more accurately.

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A.3-22 Equilibrium Data for Ammonia-Water System
Partial Pressure of NH3
in Vapor, p (mm Hg)
Mole Fraction
NH, in Liquid, x₁
0
0.0126
0.0167
0.0208
0.0258
0.0309
0.0405
0.0503
0.0737
0.0960
0.137
0.175
0.210
0.241
0.297
20°C (293 K)
0
12
15
18.2
24.9
31.7
50.0
69.6
114
166
227
298
470
30°C (303 K)
0
11.5
15.3
19.3
24.4
29.6
40.1
51.0
79.7
110
179
260
352
454
719
Mole Fraction NH, in
Vapor, y; P = 1 Atm
20°C
0
0.0158
0.0197
0.0239
0.0328
0.0416
0.0657
0.0915
0.150
0.218
0.298
0.392
0.618
30°C
0
0.0151
0.0201
0.0254
0.0321
0.0390
0.0527
0.0671
0.105
0.145
0.235
0.342
0.463
0.597
0.945
Transcribed Image Text:A.3-22 Equilibrium Data for Ammonia-Water System Partial Pressure of NH3 in Vapor, p (mm Hg) Mole Fraction NH, in Liquid, x₁ 0 0.0126 0.0167 0.0208 0.0258 0.0309 0.0405 0.0503 0.0737 0.0960 0.137 0.175 0.210 0.241 0.297 20°C (293 K) 0 12 15 18.2 24.9 31.7 50.0 69.6 114 166 227 298 470 30°C (303 K) 0 11.5 15.3 19.3 24.4 29.6 40.1 51.0 79.7 110 179 260 352 454 719 Mole Fraction NH, in Vapor, y; P = 1 Atm 20°C 0 0.0158 0.0197 0.0239 0.0328 0.0416 0.0657 0.0915 0.150 0.218 0.298 0.392 0.618 30°C 0 0.0151 0.0201 0.0254 0.0321 0.0390 0.0527 0.0671 0.105 0.145 0.235 0.342 0.463 0.597 0.945
Absorption of Ammonia in a Tray Tower. A tray tower is to be used to remove
99% of the ammonia from an entering air stream containing 6 mol % ammonia
at 293 K and 1.013 × 105 Pa. The entering pure water flow rate is 188 kg
H₂O/h·m² and the inert air flow is 128 kg air/h- m². Calculate the number of
theoretical trays needed. Use equilibrium data from Appendix A.3. For the
dilute end of the tower, plot an expanded diagram to step off the number of
trays more accurately.
Transcribed Image Text:Absorption of Ammonia in a Tray Tower. A tray tower is to be used to remove 99% of the ammonia from an entering air stream containing 6 mol % ammonia at 293 K and 1.013 × 105 Pa. The entering pure water flow rate is 188 kg H₂O/h·m² and the inert air flow is 128 kg air/h- m². Calculate the number of theoretical trays needed. Use equilibrium data from Appendix A.3. For the dilute end of the tower, plot an expanded diagram to step off the number of trays more accurately.
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