Mass Transfer
To get high tray efficiency

Time of contact between the two phases should be less
Liquid entrainment should be severe
Gas velocity should be very low
Interfacial surface between liquid and gas phase should be large

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Mass Transfer
In case of an absorber, the operating

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

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