Mass Transfer
Plate efficiency

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

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Mass Transfer
Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when

Viscosity of liquid components is very high
One of the liquid components has very high affinity towards the solvent
Extracting solvent is cheaply & abundantly available
One of the liquid components is heat sensitive

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