Mass Transfer
As the reflux ratio in a distillation coloumn is increased from the minimum, the

Liquid flow increases while the vapor flow decreases for a system
Total cost first decreases and then increases
Number of plates decreases very slowly first and then more and more rapidly
Slope of the operating line in stripping section decreases

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Mass Transfer
Entrainer used in azeotropic distillation should

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
Form a new azeotrope of low relative volatility with one of the constituents of the mixture

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