Mass Transfer
In distillation columns, the number of bubble caps per tray primarily depends upon the

Allowable liquid velocity
Allowable gas velocity
Feed composition
Allowable gas and liquid velocities

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Mass Transfer
Molecular diffusion is caused by the

Activation energy of the molecules
Potential energy of the molecules
Transfer of molecules from low concentration to high concentration region
Thermal energy of the molecules

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Mass Transfer
Priming in a distillation column

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

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