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| - Kinetics and Mechanism of Copper Extraction withDialkylphosphoric Acids and Hydroxyoximes Studied by a RotatingDiffusion Cell
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| - A rotating diffusion cell with a porous membrane was used to studythe kinetics of liquid/liquidextraction of copper ions using commercially important acidicextractants, i.e. dialkylphosphoricacids and hydroxyoximes. The reaction zone is assumed to besituated in a thin zone of varyingthickness within the aqueous diffusion layer but adjacent to theaqueous/organic interface. Thekinetic results were modeled by assuming a mixed control regimeinvolving both chemical reactionand diffusion of reactants and products to and from the reaction zoneas controlling steps. The“solubility” of the extractant in the aqueous phase, expressed interms of the extractantdistribution coefficient between the organic and aqueous phases, wasshown to exert aconsiderable influence on the kinetic performance of the extractants.By the distributioncoefficient being incorporated into the kinetic model, it is nowpossible to fully explain thebehavior of the extraction rate curve with changing hydrogen ionconcentration in the aqueousphase. The thickness of the reaction zone for hydroxyoximes isestimated to be of the order of1.3 × 10-3 μm while for dialkylphosphoric acids it isof the order of 0.7 μm.
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