Mass Transfer
In steam distillation, the

Temperature is more than 100° C
Temperature is higher than the boiling point of either component
Temperature is 100°C
Product must be immiscible with water

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Mass Transfer
In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because

Temperature is less
Total pressure is less
Saturated steam is used for steam distillation
Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition

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