Mass Transfer
Separation of a mixture of two gases by absorption in the liquid solvent depends upon the difference in their

Viscosity
Density
Relative volatility
Solubility

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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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