Mass Transfer
Entrainer used in azeotropic distillation should

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

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Mass Transfer
A coalescer in a mixer-settler liquid-liquid extraction coloumn

Helps in increasing the bubble size entering the settler
Helps in increasing the settling rate of the bubbles
Comprises of thin bed of substances of extended surface having high porosity
All of these

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