Mass Transfer
Steady state equimolal counter diffusion occurs in case of

Binary phase distillation
Absorption
Liquid-liquid extraction
Leaching

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Mass Transfer
An example of elutioh is

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

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