Mass Transfer
The McCabe Δ L law states that the

Linear crystal growth rate does not depend on the crystal size
Linear crystal growth rate depends on the degree of supersaturation
Linear crystal growth rate depends on the crystal size
Molar heats of vaporisation of components are nearly equal

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Mass Transfer
Steam distillation is not recommended to be used, if the

Material to be distilled is thermally unstable or has the tendency to react with other components associated with it, at the boiling temperature
Material can not be distilled by indirect heating even under low pressure, because of the high boiling temperature
Liquids decompose, if distilled directly at atmospheric pressure
Azeotropic mixture is to be separated and the final product is miscible with water

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Mass Transfer
Channelling is most severe

In towers packed with stacked packing
In towers packed randomly with crushed solids
At very high liquid flow rate
In dumped packing of regular units

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