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

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 $\overline {3[{\rm<Emphasis Type="Bold">MA</Emphasis>}] \cdot [{{\rm{H}}_3}{\rm{P}}{{\rm{O}}_4}]} $ complex in the organic phase. The thermodynamic properties determined at various temperatures indicated that the process was exothermic with a calculated enthalpy (ΔH ^⊖) 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.

Keywords

solvent extraction / phosphorus / benzyl dimethyl amine (BDMA) / sulfuric acid solution / McCabe-Thiele diagram

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