Mass Transfer
Drying operation under vacuum is carried out to

Reduce drying temperature
Dry materials having high bound moisture content
Increase drying temperature
Dry those materials which have very high unbound mositure content

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Mass Transfer
Steam distillation is used to

Avoid thermal decomposition of a component
Increase the total pressure of distillation
Reduce the number of plates
Increase the efficiency of separation

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Mass Transfer
In steam distillation, the

Temperature is higher than the boiling point of either component
Product must be immiscible with water
Temperature is more than 100° C
Temperature is 100°C

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