Mass Transfer
Extraction of coffee from its seed is done by

Extractive distillation
Steam distillation
Liquid-liquid extraction
Leaching

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Mass Transfer
Channelling is most severe

In towers packed randomly with crushed solids
At very high liquid flow rate
In towers packed with stacked packing
In dumped packing of regular units

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Mass Transfer
When the liquid phase and vapour phase of a binary system obeys Raoult's and Dalton's law respectively, the relative volatility is the ratio of

Vapour pressure of component A to that of component B
Partial pressure of component A to the total pressure
Vapour pressure of component A to the partial pressure of A
Vapour pressure of component A to the total pressure

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