Mass Transfer
In a counter-current liquid extractor

Both liquids flow at fixed rate
Both liquids can have any desired flow rate
Only one of the liquids may be pumped at any desired rate
Liquid's flow rate depends upon the temperature and pressure

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

Total pressure is less
Saturated steam is used for steam distillation
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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