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Research Article

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

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  • Received: 18 May 2020Revised: 5 July 2020Accepted: 21 July 2020Available online: 24 July 2020
  • This study addresses the liquid-liquid extraction behavior of phosphorus from a sulfuric acid solution using benzyl-di-methyl amine (BDMA) in kerosene. The extraction equilibria investigated with varied BDMA concentration could reveal the formation of ¯(3[BDMA].[H3PO4]) into the organic phase. The thermodynamic properties determined at the different temperatures indicated that the process exhibits exothermic nature with a calculated enthalpy (ΔH°) of −24.0 kJ/mol. The organic-to-aqueous phase ratio (O/A) 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 extraction at an O/A ratio, 2.0/3.5. The back-extraction of phosphorus from the loaded organic phase was quantitatively achieved by contacting 4.0 mol/L H2SO4 solution in three stages of counter-current contact at an O/A ratio, 3/2. The study can potentially be applied to phosphorus removal from sulphuric acid leach solution of monazite processing and many other solutions.
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Liquid-liquid extraction of phosphorus from sulfuric acid solution using benzyl-di-methyl amine

  • Corresponding author:

    Hyunjung Kim    E-mail: kshjkim@jbnu.ac.kr

  • 1. Department of Mineral Resources and Energy Engineering, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea
  • 2. Center for Advanced Chemistry, Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam
  • 3. Faculty of Natural Sciences, Duy Tan University, Da Nang 550000, Vietnam

Abstract: This study addresses the liquid-liquid extraction behavior of phosphorus from a sulfuric acid solution using benzyl-di-methyl amine (BDMA) in kerosene. The extraction equilibria investigated with varied BDMA concentration could reveal the formation of ¯(3[BDMA].[H3PO4]) into the organic phase. The thermodynamic properties determined at the different temperatures indicated that the process exhibits exothermic nature with a calculated enthalpy (ΔH°) of −24.0 kJ/mol. The organic-to-aqueous phase ratio (O/A) 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 extraction at an O/A ratio, 2.0/3.5. The back-extraction of phosphorus from the loaded organic phase was quantitatively achieved by contacting 4.0 mol/L H2SO4 solution in three stages of counter-current contact at an O/A ratio, 3/2. The study can potentially be applied to phosphorus removal from sulphuric acid leach solution of monazite processing and many other solutions.

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