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

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

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Mass Transfer
McCabe-Thiele method

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

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