Mass Transfer
Steam distillation is used to separate

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

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Mass Transfer
A coalescer in a mixer-settler liquid-liquid extraction coloumn

Helps in increasing the settling rate of the bubbles
Helps in increasing the bubble size entering the settler
All of these
Comprises of thin bed of substances of extended surface having high porosity

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