Mass Transfer
Entrainer used in azeotropic distillation should

Have high latent heat of vaporisation
Have high viscosity to provide high tray efficiency
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
In steam distillation, the

Temperature is 100°C
Product must be immiscible with water
Temperature is higher than the boiling point of either component
Temperature is more than 100° C

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