Mass Transfer
Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the

Pressure drop in the equipment will be very high
Viscosity variation of the fluids may cause channeling/flooding
None of these
Packing may be crushed due to thermal expansion/contraction of the components of the equipments

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Mass Transfer
To get high tray efficiency

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

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