Mass Transfer
Entrainer used in azeotropic distillation should

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

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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

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

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