Mass Transfer
In an operating distillation column, the

Driving force for the liquid flow is its specific weight
Driving force for the vapor flow is the pressure drop, as the pressure decreases gradually from the bottom to the top of the column
Vapors and liquids are at their dew point and bubble point respectively
Highest temperature is encountered at the top of the column

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Mass Transfer
Priming in a distillation column

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

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