Title: steady state extraction
Long Title: IUPAC Gold Book - steady state extraction
DOI: 10.1351/goldbook.10188
Status: current

Definition
State of a continuous process operating in such a way that the concentration of solutes in exit streams remains constant with respect to time for constant feed concentrations, even though the two phases are not necessarily in thermodynamic equilibrium in any part of the process.

Note
The term equilibrium should not be used to describe this situation.

Related Term
- feed: https://goldbook.iupac.org//terms/view/10177

Source
- PAC, 2016, 88, 517. 'Glossary of terms used in extraction (IUPAC Recommendations 2016)' on page 526 (https://doi.org/10.1515/pac-2015-0903)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/10188/html
- json: https://goldbook.iupac.org/terms/view/10188/json
- xml: https://goldbook.iupac.org/terms/view/10188/xml

Citation: Citation: 'steady state extraction' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.10188
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Accessed: 2026-04-20T23:32:52+00:00