Mass Transfer
Binary distillation involves the mass transfer by __________ at the gas-liquid interface.

A counter diffusion at an almost equal molar rate
Unidirectional diffusion from liquid to gas phase
Unidirectional diffusion from gas to liquid phase
Either A or B

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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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