Mass Transfer
In extractive distillation, solvent is

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

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Mass Transfer
For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because

Solubility of the components of air in water is very small
Lewis number is close to unity
They are always equal under all circumstances
Water has a high latent heat of evaporation

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Mass Transfer
Henry's law states that the

Partial pressure of a component over a solution is proportional to the mole fraction in the vapour
Partial pressure of a component over a solution is proportional to its mole fraction in the liquid
Partial pressure is equal to the product of the mole fraction and total pressure
Vapour pressure is equal to the product of the mole fraction and total pressure

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