Mass Transfer
An example of elutioh is

Recovery of vegetable oils from seeds
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

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

Very small quantity of solvent is required
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

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Mass Transfer
For absorbing a sparingly soluble gas in a liquid

Mass transfer co-efficient must be kept constant
Gas side mass transfer co-efficient should be increased
Liquid side mass transfer co-efficient should be increased
Liquid side mass transfer co-efficient should be decreased

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