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
To get high tray efficiency

Liquid entrainment should be severe
Interfacial surface between liquid and gas phase should be large
Gas velocity should be very low
Time of contact between the two phases should be less

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Mass Transfer
In saturated gas, the

Vapour is in equilibrium with the liquid at the gas temperature
Partial pressure of vapour equals the vapour pressure of the liquid at room temperature
Vapour is in equilibrium with the liquid at the room temperature
None of the listed here

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