Mass Transfer
In extractive distillation, solvent is

Of high volatility
Of high viscosity to give high tray efficiency
Added to alter the relative volatility of the mixture
Present in overhead stream

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Mass Transfer
Blowdown in a cooling tower

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

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