Liquid–liquid extraction of phosphorus from sulfuric acid solution using benzyl&nbsp;dimethyl amine

Sadia Ilyas; Rajiv Ranjan Srivastava; Hyunjung Kim

doi:10.1007/s12613-020-2151-8

Volume 28 Issue 3

Mar. 2021

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2021 > 28(3): 367-372

Sadia Ilyas, Rajiv Ranjan Srivastava, and Hyunjung Kim, Liquid–liquid extraction of phosphorus from sulfuric acid solution using benzyl dimethyl amine, Int. J. Miner. Metall. Mater., 28(2021), No. 3, pp. 367-372. https://doi.org/10.1007/s12613-020-2151-8

Cite this article as:

Sadia Ilyas, Rajiv Ranjan Srivastava, and Hyunjung Kim, Liquid–liquid extraction of phosphorus from sulfuric acid solution using benzyl dimethyl amine, Int. J. Miner. Metall. Mater., 28(2021), No. 3, pp. 367-372. https://doi.org/10.1007/s12613-020-2151-8

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Research Article

Liquid–liquid extraction of phosphorus from sulfuric acid solution using benzyl dimethyl amine

+ Author Affiliations

Corresponding author:
Hyunjung Kim E-mail: kshjkim@jbnu.ac.kr
Received: 18 May 2020; Revised: 5 July 2020; Accepted: 21 July 2020; Available online: 24 July 2020

Abstract

Abstract

This study addresses the liquid–liquid extraction behavior of phosphorus from a sulfuric acid solution using benzyl dimethyl amine (BDMA) in kerosene. The extraction equilibria investigated with varied BDMA concentrations could reveal the formation of
\begin{document}$\overline {3\left[ {{\rm{BDMA}}} \right] \cdot \left[ {{{\rm{H}}_3}{\rm{P}}{{\rm{O}}_4}} \right]} $\end{document}
complex in the organic phase. The thermodynamic properties determined at various temperatures indicated that the process was exothermic with a calculated enthalpy (
$\Delta {H^ \ominus }$
) of −24.0 kJ·mol⁻¹. The organic-to-aqueous phase (O/A) volume ratio was varied to elucidate the quantitative extraction of phosphorus. The McCabe–Thiele diagram plotted for the extraction isotherm was validated for the requirement of three counter-current stages in the extraction at an O/A volume ratio of 2.0/3.5. The back-extraction of phosphorus from the loaded organic phase was quantitatively achieved by contacting 4.0 mol·L⁻¹ H₂SO₄ solution in three stages of counter-current contact at an O/A volume ratio of 3/2. This study can be applied to remove phosphorus from the sulfuric acid leach solutions of monazite processing, and many other solutions.
- solvent extraction;
- phosphorus;
- benzyl dimethyl amine (BDMA);
- sulfuric acid solution;
- McCabe–Thiele diagram

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