Mass Transfer
A 25 cm x 25 cm x 1 cm flat sheet weighing 1.2 kg initially was dried from both sides under constant drying rate conditions. It took 1500 seconds for the weight of the sheet to reduce to 1.05 kg. Another 1m x 1m x 1cm flat sheet of the same material is to be dried from one side only.Under the same constant drying rate conditions, the time required for drying (in seconds) from its initial weight of 19.2 kg to 17.6 kg is

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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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