Mass Transfer
A binary mixture of benzene and cyclohexane is separated by

Extractive distillation
Solvent extraction
Flash vaporisation
Ordinary distillation

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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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