Mass Transfer
In a counter-current extractor, as the axial mixing increases, the extraction efficiency

Decreases
Increases
Remains unchanged
Depends on the pressure of the system

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Mass Transfer
An example of elutioh is

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

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

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