A study of scatchard-hildebrand solution theory for metal solvent extraction systems

In this paper the thermodynamic properties of two important extractants in hydrometallurgy (D2EHPA and EHEHPA) are studied. The activity coefficients of various diluents in D2EHPA-hydrocarbon binary systems are measured by gas chromatographic headspace analysis. The experimental data are regressed b...

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Bibliographic Details
Published in:Fluid phase equilibria 1986, Vol.30, p.297-306
Main Authors: Li, Yi-Gui, Teng, Teng, Lu, Jiu-Fang, Chen, Gang, Li, Ji-Ding
Format: Article
Language:English
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Summary:In this paper the thermodynamic properties of two important extractants in hydrometallurgy (D2EHPA and EHEHPA) are studied. The activity coefficients of various diluents in D2EHPA-hydrocarbon binary systems are measured by gas chromatographic headspace analysis. The experimental data are regressed by using the Scatchard-Hildebrand solution theory. After revision of the mixing entropy, departures from the geometric mean of the cohesive energy are determined. Some regularities have been found. A new parameter δ 12 indicating the interaction energy between unlike molecules has been defined and discussed. The extension of Scatchard-Hildebrand equation from binary systems to multicomponent systems with metal complexes in organic phase (EHEHPA-nC 7H 16 -CoSO4-CuSO4 extraction system) is also studied. The real “thermodynamic equilibrium constants” for metal extraction reactions have been determined.
ISSN:0378-3812
1879-0224
DOI:10.1016/0378-3812(86)80063-2