Mass Transfer
Steam distillation is used to separate

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

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Mass Transfer
Use of raschig rings in place of crushed stones as packing in packed beds (other things being same)

Increases pressure drop, increases surface area
Decreases pressure drop, decreases surface area
Increases pressure drop, decreases surface area
Decreases pressure drop, increases surface area

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