INTERFACIAL ADSORPTION OF β-DIKETONES IN VIGOROUSLY STIRRED HEPTANE/AQUEOUS PHASE SYSTEMS
- 1 January 1989
- journal article
- research article
- Published by Taylor & Francis in Solvent Extraction and Ion Exchange
- Vol. 7 (2) , 361-376
- https://doi.org/10.1080/07360298908962313
Abstract
Interfacial adsorptivity of seven β-diketones, including five trifluoromethyl-derivatives, was investigated in vigorously stirred liquid-liquid systems composed of heptane and aqueous phases. Preferential adsorption of the corresponding enolate ions at the interface generated by stirring was observed in all the systems. It was shown that the interfacial adsorptivity is governed by the distribution constant and the dissociation constant, which determine the distribution equilibria between bulk phases, and the adsorption constant, the saturated interfacial concentration and the total interfacial area, which characterize the Langmuir isotherm. Between the logarithmic values of the adsorption constant and the distribution constant, a linear relationship was found out.Keywords
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