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The surface excess and the rate of copper extraction by hydroxyoximes
Author(s) -
Szymanowski Jan,
Prochaska Krystyna
Publication year - 1987
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.280400304
Subject(s) - oxime , adsorption , copper , surface tension , chemistry , extraction (chemistry) , copper extraction techniques , gibbs isotherm , surface (topology) , thermodynamics , chromatography , inorganic chemistry , organic chemistry , physics , geometry , mathematics
Abstract The interfacial tension is determined for some model 2‐hydroxy‐5‐alkylbenzophenone E‐oximes, and the surface excess is calculated according to the different adsorption isotherms. The relationship between the rate of copper extraction and the surface excess is discussed. It is shown that, depending upon the adsorption isotherm used to calculate the surface excess, different relations both between the extraction rate and the surface excess and between the surface excess and the oxime concentration are obtained. The interfacial activity of hydroxyoximes is only a qualitative parameter suggesting the interfacial mechanism for copper extraction, and it cannot give strong evidence quantitatively supporting this mechanism. The predicted reaction orders against oxime demonstrate that the reaction between the oxime molecules from the sublayer and the absorbed intermediate complex is probably the limiting step.