Mass Transfer
McCabe-Thiele method

Uses molal units for material and energy balance
Uses weight fractions to express liquid and vapour composition
Is more accurate than Ponchan-Savarit method
Can use any type of units

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Mass Transfer
Plate efficiency

Increases due to weeping and dumping of liquid
Increases due to foaming
Is a function of the mass transfer between liquid and vapour
Increases due to liquid entrainment

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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
Vapour pressure is equal to the product of the mole fraction and total pressure
Partial pressure is equal to the product of the mole fraction and total pressure

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