Mass Transfer
To get high tray efficiency

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

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Mass Transfer
In case of a desorber (stripper), the

Operating line always lies below the equilibrium curve
Temperature remains unaffected
Operating line always lies above the equilibrium curve
Temperature always increases

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