Mass Transfer
Inside the distillation column, the

Liquids are not always at their bubble points
None of these
Pressure increases gradually from bottom to the top of the column
Driving force for the vapour flow is the pressure drop

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Mass Transfer
McCabe-Thiele method

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

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