Mass Transfer
For a binary mixture with low relative volatility, continuous rectification to get pure products will require

High reflux ratio
Low reflux ratio
Less number of trays
Small cross-section column

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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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