Mass Transfer
Design calculation for multiple component distillation is done by

Enthalpy concentration method
Ponchon-Savarit method
Tray to tray calculations
Mccabe-Thiele method

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

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