Mass Transfer
Extraction of coffee from its seed is done by

Steam distillation
Liquid-liquid extraction
Extractive distillation
Leaching

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Mass Transfer
Plate efficiency

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

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Mass Transfer
Inside the distillation column, the

Liquids are not always at their bubble points
None of these
Pressure increases gradually from bottom to the top of the column
Driving force for the vapour flow is the pressure drop

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