Mass Transfer
Extraction of coffee from its seed is done by

Leaching
Steam distillation
Liquid-liquid extraction
Extractive distillation

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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

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

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Mass Transfer
Inside the distillation column, the

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

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