Extraction kinetics of neodymium(III) from chloride medium in the presence of two complexing agents by D2EHPA using a constant interfacial area cell with laminar flow

• Kinetics of Nd(III) in the complexing extraction system is studied.
• The extraction rate is controlled by a diffusion controlled process at the interface.
• Rate equation is also obtained by slope analysis.
• A mass transfer controlled reaction is proposed and evaluated.

Kinetic studies of the extraction of neodymium (Nd) from chloride medium in the presence of two complexing agents lactic acid (HLac) and citric acid (H3Cit) by D2EHPA (H2A2) in kerosene have been investigated using a constant interfacial area cell with laminar flow. The different parameters affecting the extraction rate such as stirring speed, temperature, specific interface area, hydrogen ion concentration, and H2A2 concentration are separately studied and a rate equation is deduced. The experimental results demonstrate that, the rate of Nd(III) extraction is a diffusion controlled process at the interface rather than in the bulk phase, and it is first order with respect to H2A2 and H+ concentrations. The rate-determining step is proposed on the basis of predictions derived from interfacial reaction models, and is in good agreement with the analysis of the experimental results.

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