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

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

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Mass Transfer
In an operating distillation column, the

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

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