Mass Transfer
In a counter-current liquid extractor

Only one of the liquids may be pumped at any desired rate
Liquid's flow rate depends upon the temperature and pressure
Both liquids can have any desired flow rate
Both liquids flow at fixed rate

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Mass Transfer
An example of elutioh is

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

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Mass Transfer
Steam distillation is not recommended to be used, if the

Liquids decompose, if distilled directly at atmospheric pressure
Material to be distilled is thermally unstable or has the tendency to react with other components associated with it, at the boiling temperature
Azeotropic mixture is to be separated and the final product is miscible with water
Material can not be distilled by indirect heating even under low pressure, because of the high boiling temperature

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