Mass Transfer
McCabe-Thiele method

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

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Mass Transfer
To get high tray efficiency

Interfacial surface between liquid and gas phase should be large
Liquid entrainment should be severe
Time of contact between the two phases should be less
Gas velocity should be very low

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