Mass Transfer
In distillation where q is defined as the moles of liquid flow in the stripping section per mole of feed introduced, for saturated liquid feed

q = 1
q > 1
q = 0
q < 1

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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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