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Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants

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Solvent extraction kinetics of rare earth elements.

J Gao¹, B Peng, H Fan

¹Department of Chemistry, Northwest Normal University, Lanzhou, People's Republic of China.

|October 1, 1996

Summary

This summary is machine-generated.

This study details the kinetics of rare earth element extraction using 1-(2-pyridylazo)-2-naphthol (PAN). The extraction rate is influenced by metal ion, hydrogen ion, and the PAN complex formation.

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Area of Science:

Analytical Chemistry
Separation Science
Inorganic Chemistry

Background:

Rare earth elements (RE) are critical in modern technologies.
Efficient extraction methods are essential for RE recovery and purification.
Solid-liquid extraction offers a promising route for RE separation.

Purpose of the Study:

To investigate the extraction kinetics of specific rare earth elements (La, Ce, Sm, Dy, Yb).
To determine the rate-determining step in the solid-liquid extraction process.
To elucidate the influence of various chemical species on the extraction rate.

Main Methods:

Solid-liquid extraction using 1-(2-pyridylazo)-2-naphthol (PAN) as an extractant.
Paraffin wax utilized as a diluent at a constant temperature of 60°C.
Kinetic analysis involving determination of reaction orders and rate constants.

Main Results:

Extraction rate found to be first order with respect to metal ion and hydrogen ion.
Extraction rate found to be second order with respect to the PAN extractant.
The rate-determining step identified as the formation of an [RE(PAN)2]+ complex in the aqueous phase.
A high rate constant of approximately 10^11 L mol^-1 s^-1 was determined.

Conclusions:

The study provides a detailed kinetic model for RE extraction with PAN.
Understanding the reaction mechanism facilitates optimization of extraction processes.
The calculated activation parameters offer insights into the thermodynamics of the extraction.