Mass Transfer
In extractive distillation, solvent is

Added to alter the relative volatility of the mixture
Of high viscosity to give high tray efficiency
Present in overhead stream
Of high volatility

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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
Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition
Temperature is less

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