Mass Transfer
Flooding results in

Low tray efficiency
Good contact between the fluids
High tray efficiency
High gas velocity

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Mass Transfer
An example of elutioh is

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

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