Mass Transfer
In rectifying section of a continuous distillation column, the

Liquid is stripped of high boilers
Vapour is enriched with high boilers
Vapour is enriched with low boilers
None of these

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Mass Transfer
McCabe-Thiele method

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

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