Mass Transfer
Design calculation for multiple component distillation is done by

Enthalpy concentration method
Ponchon-Savarit method
Mccabe-Thiele method
Tray to tray calculations

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Mass Transfer
Priming in a distillation column

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

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