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

Azeotropic mixture is to be separated and the final product is miscible with water
Liquids decompose, if distilled directly at atmospheric pressure
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

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Mass Transfer
McCabe-Thiele method

Uses weight fractions to express liquid and vapour composition
Uses molal units for material and energy balance
Can use any type of units
Is more accurate than Ponchan-Savarit method

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