Mass Transfer
Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when

Viscosity of liquid components is very high
One of the liquid components is heat sensitive
Extracting solvent is cheaply & abundantly available
One of the liquid components has very high affinity towards the solvent

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Mass Transfer
Entrainer used in azeotropic distillation should

Have high latent heat of vaporisation
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 viscosity to provide high tray efficiency

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