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
Azeotropic mixture is to be separated and the final product is miscible with water
Liquids decompose, if distilled directly at atmospheric pressure
Material can not be distilled by indirect heating even under low pressure, because of the high boiling temperature

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Mass Transfer
Flash distillation is

Used for multicomponent systems like crude refining
Same as simple distillation
Most useful for handling binary systems
Same as differential distillation

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