Mass Transfer
Plate efficiency

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

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Mass Transfer
McCabe-Thiele method

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

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