Mass Transfer
Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are

1
8
9
10

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Mass Transfer
As the reflux ratio in a distillation coloumn is increased from the minimum, the

Slope of the operating line in stripping section decreases
Number of plates decreases very slowly first and then more and more rapidly
Liquid flow increases while the vapor flow decreases for a system
Total cost first decreases and then increases

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Mass Transfer
In case of an absorber, the operating

Velocity is more than the loading velocity
Line always lies above the equilibrium curve
Line always lies below the equilibrium curve
Line can be either above or below the equilibrium curve

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