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Modeling Au(CN) 2 − extraction by mixtures of primene JMT and cyanex 925 reagents
Author(s) -
Alguacil Francisco José
Publication year - 1999
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690451012
Subject(s) - extraction (chemistry) , chemistry , partition coefficient , equilibrium constant , reagent , aqueous two phase system , aqueous solution , phase (matter) , thermodynamics , analytical chemistry (journal) , chromatography , inorganic chemistry , organic chemistry , physics
A chemically based thermodynamic model to predict the distribution coefficient has been developed for the Au(CN) 2 − ‐Primene JMT‐Cyanex 925 system. The predictive model makes use of the extraction mechanism, speciation in the organic phase, and the equilibrium constant for the extraction reaction. The distribution coefficient of gold can be predicted by the equation D Au = K′[H + ], where K′ is an effective extraction constant and [H + ] is the proton concentration of the aqueous phase at equilibrium. Excellent agreement between the experimental data and the predicted value was obtained. Furthermore, for the present extraction system, the equilibrium isotherm was determined at 20°C.