Mass Transfer
In distillation columns, the number of bubble caps per tray primarily depends upon the

Allowable liquid velocity
Allowable gas velocity
Feed composition
Allowable gas and liquid velocities

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Mass Transfer
McCabe-Thiele method

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

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