Prediction of Cu(II) Solvent Extraction Behavior with Hydroxyoxime in the Presence of Alkali-metal Chloride.

Role of the Extraction Equilibrium Constant in the Countercurrent Multistage Solvent Extraction−Stripping Process for Metal Ions

“…A semiquantitative comparison between the extraction capabilities of ketoximes and aldoximes in terms of extraction equilibrium constants can be done only when the aggregating tendencies are similar to each other on the condition that the aqueous-phase model for the equilibrium analysis is consistent with each other. Although such literature data are scarce, the extraction equilibrium constant of copper with ketoxime (anti-2-hydroxy-5-nonylacetophenone oxime) is 10 0.39 m 3 kmol -1 with the stepwise aggregation constant (Whewell et al, 1977) of 0.9 m 3 kmol -1 (Tanaka, 1992), while that with aldoxime (2-hydroxy-5-nonylbenzaldehyde oxime) is 10 1.81 m 3 kmol -1 with the stepwise aggregation constant of 0.8 m 3 kmol -1 (Tanaka, 1991). These constants, obtained by using xylene as the diluent, consider the activities for the aqueous species and the molarities for the organic species.…”