Mass Transfer
To get high tray efficiency

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

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Mass Transfer
Relative volatility varies with the concentration of component for an ideal solution. The relative volatity of a binary mixture may be defined as the ratio of vapor pressure of component 'A' to that of component 'B', when

Liquid phase obeys Dalton's law and vapor phase obeys Raoult's law
Only liquid phase obeys Dalton's law
Vapor phase obeys Dalton's law and liquid phase obeys Raoult's law
Only vapor phase follows Raoult's law

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