Foam Fractionation with Reflux.
A surface-active aqueous solution was foamed up a glass column, removed, collapsed, and returned as down-coming liquid to drain countercurrently against the rising foam. This deliberate refluxing action greatly increased the degree of separation of the surfactant over that obtainable without reflux. The effects of altering the gas rate and the solute concentration were also studied.
Lemlich
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Lavi
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