Mass Transfer
In liquid extraction, if the selectivity is unity, then

No separation will occur
Solvent flow rate should be very low
Amount of solvent required will be minimum
Separation of the constituents is the most effective

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Mass Transfer
Plate efficiency

Is a function of the mass transfer between liquid and vapour
Increases due to foaming
Increases due to weeping and dumping of liquid
Increases due to liquid entrainment

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