Mass Transfer
Steam distillation is used for separation of high boiling

Substances from non-volatile impurities
none of the listed here
Volatile impurity from still higher boiling substances
Both of the options given here

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Mass Transfer
Priming in a distillation column

Results from very low gas velocity
Is characterised by the presence of foam throughout the space between trays
Is desirable from point efficiency consideration
Reduces the overall pressure drop

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