Mass Transfer
To get high tray efficiency

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

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Mass Transfer
Entrainer used in azeotropic distillation should

Have high viscosity to provide high tray efficiency
Have high latent heat of vaporisation
Form a low boiling azeotrope with one of the constituents of the mixture
Form a new azeotrope of low relative volatility with one of the constituents of the mixture

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Mass Transfer
Relative humidity is the ratio of the

Partial pressure of the vapour to the vapour pressure of the liquid at room temperature
None of these
Actual humidity to saturation humidity
Partial pressure of the vapour to the vapour pressure of the liquid at gas temperature

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