Mass Transfer
Priming in a distillation column

Is desirable from point efficiency consideration
Reduces the overall pressure drop
Results from very low gas velocity
Is characterised by the presence of foam throughout the space between trays

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Mass Transfer
Plate efficiency

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

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