Mass Transfer
To get high tray efficiency

Liquid entrainment should be severe
Gas velocity should be very low
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

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