The Kinetics of Metal Solvent Extraction

Mass transfer based on chemical potential theory: ZnSO4/H2SO4/D2EHPA

“…Nevertheless, the independence of the extraction rate on the stirring speed is not always clear evidence of kinetic limitation. Often the agitators lose efficiency at higher speed and the diffusional mass transfer becomes unaffected by the increased rotation (Danesi and Chiarizia, 1980). In this case the diffusional contribution to the overall extraction rate may still be significant or even dominating.…”

“…43, No. 10 adjusted to the highest possible extent without disturbing the interface, and the zinc concentration was generally kept very low to reach a kinetically controlled regime (Danesi and Chiarizia, 1980) where the diffusional transfer of the reactants and products is much faster than the chemical reaction. Thus, the modeling could be performed by simply using a kinetic law.…”

Structure—activity relationships for hydroxyoxime metal extractants

“…Various physicochemical parameters and extraction data have been described for commercial and model hydroxyoxime extractants. [1][2][3][4][5][6] It has been found that the rate of copper extraction with hydroxyoximes depends upon extractant hydrophobicity and significantly increases when the alkyl length decreases. Similarly hydroxyoxime solubility decreases in aqueous solutions with increasing chain length.…”

Chemical Kinetics and Reaction Mechanisms in Solvent Extraction: New Trends and Applications

“…When the extractant has low surface activity and a relatively high solubility in the aqueous phase, the reaction takes place in the aqueous phase. [7][8][9] In case where the extractant is relatively soluble and the reaction is neither controlled by the diffusion process nor by any reaction at the interface. When the reaction occur at the interface, the transport of molecules from one phase to the other occurs even without mechanical agitation of the two phases.…”