Mass Transfer
Chemisorption (chemical adsorption) is

An irreversible phenomenon
Characterised by adsorption of heat
Same as "Van der Waals" adsorption
A reversible phenomenon

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Mass Transfer
Plate efficiency

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

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