Mass Transfer
Inside the distillation column, the

Driving force for the vapour flow is the pressure drop
Pressure increases gradually from bottom to the top of the column
Liquids are not always at their bubble points
None of these

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

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

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