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

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Mass Transfer
An example of elutioh is

Dissolution of tannin out of tree barks by water
Separation of uranium oxide from its ore by H₂SO₄ in a Pachuca tank
Separation of sugar from sugar beet by hot water
Recovery of vegetable oils from seeds

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