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

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Mass Transfer
In case of a desorber (stripper), the

Temperature always increases
Operating line always lies below the equilibrium curve
Temperature remains unaffected
Operating line always lies above the equilibrium curve

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