fraction extracted, $E$

The fraction of the total quantity of a substance extracted (usually by the solvent) under specified conditions, i.e. $E A = Q A Q A '$ where $Q A$ is the mass of A extracted and $Q A '$ is the total mass of A present at the start.

Notes:

$E$ may be expressed as a percentage, $% E$ .
The term extractability is qualitative and should not be used as a synonym for fraction extracted.
If the aqueous phase is extracted with $n$ successive portions of solvent, the phase volume ratio (solvent/feed) being $r$ each time, the fraction extracted is given by:
$E n = 1 − ( r D + 1 ) − n$
If $n = r = 1$ and $E 1 = D 1 + D$ this expression is a concept of value in chromatography theory.
The fraction extracted is also known as the recovery factor, especially for a multistage process.

Source:

PAC, 1993, 65, 2373 (Nomenclature for liquid-liquid distribution (solvent extraction) (IUPAC Recommendations 1993)) on page 2384

Related index:

IUPAC > Gold Book > math/physics > quantities

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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook.

Last update: 2014-02-24; version: 2.3.3.

DOI of this term: https://doi.org/10.1351/goldbook.F02503.

Original PDF version: http://www.iupac.org/goldbook/F02503.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.

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