Mass Transfer
The Hatta number is important in

Binary distillation
Gas absorption with chemical reaction
Multicomponent distillation
Gas absorption without chemical reaction

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

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