Mass Transfer
When the solvent dissolves very little of solute, then

Solvent of low freezing point should be used
Solvent of low latent heat of vaporisation should be used
Large quantity of solvent is required to extract the solute
Very small quantity of solvent is required

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Mass Transfer
An example of elutioh is

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

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