Mass Transfer
An example of elutioh is

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

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Mass Transfer
An aqueous solution of methanol is to be distilled in a tray column. High pressure steam is available as a source of heat. For a given reflux ratio and overhead composition, two options are being explored; (i) a reboiler is used and (ii) no reboiler is used but steam is fed directly to the bottom of the column. As compared to option (i), in option (ii)

Composition of the residue remains unchanged
Less number of trays are required
More number of trays are required and the residue composition is more dilute in methanol
More number of trays are required but the residue composition remains unchanged

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