Mass Transfer
The reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives

High pressure drop and low hold up
High pressure drop and high hold up
Low pressure drop and high hold up
Low pressure drop and low hold up

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Mass Transfer
Plate efficiency

Increases due to foaming
Increases due to weeping and dumping of liquid
Increases due to liquid entrainment
Is a function of the mass transfer between liquid and vapour

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