Mass Transfer
Steam distillation is used to separate

Heat sensitive materials
High boiling substances from nonvolatile impurities
Mixtures of low relative volatility
Azeotropes

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

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

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Mass Transfer
To get high tray efficiency

Interfacial surface between liquid and gas phase should be large
Gas velocity should be very low
Liquid entrainment should be severe
Time of contact between the two phases should be less

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