Mass Transfer
During constant rate drying period, vaporisation rate per unit drying surface area

Increases with time
Does not change with time
Does not affect the moisture content of the wet solid
Decreases with time

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Mass Transfer
Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when

Extracting solvent is cheaply & abundantly available
One of the liquid components is heat sensitive
One of the liquid components has very high affinity towards the solvent
Viscosity of liquid components is very high

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Mass Transfer
Plate efficiency

Increases due to foaming
Increases due to liquid entrainment
Is a function of the mass transfer between liquid and vapour
Increases due to weeping and dumping of liquid

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