Mass Transfer
Blowdown in a cooling tower

Is undesirable
Increases the scale forming tendencies of water
All of these
Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities

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Mass Transfer
Steam distillation is not recommended to be used, if the

Liquids decompose, if distilled directly at atmospheric pressure
Azeotropic mixture is to be separated and the final product is miscible with water
Material can not be distilled by indirect heating even under low pressure, because of the high boiling temperature
Material to be distilled is thermally unstable or has the tendency to react with other components associated with it, at the boiling temperature

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