An Application of UNIFAC Equation to H2O-n-C12H26-D2EHPA-LaCl3-HCl Extraction System

Abstract

Abstract: The liquid-liquid equilibrium data for H₂O-n-C₁₂H₂₆-D₂EHPA-LaCl₃-HCl extraction system were determined.The partial pressures of n-C₁₂H₂₆ in LLEfor H₂O-n-C₁₂H₂₆-D₂EHPAwere measured by gas chromatography with hydrogen flame detector.The Pitzer equation is used to calculate the activity of water and the individual ionic activity coefficients of H⁺ and La³⁺ in aqueous phase.The U-NIFACequation is used to calculate the activity coefficients of components in organic phase.Amethod to divide the extractant and metal organic complex into functional groups is proposed.By regression of the experimental data, the equilibrium constant of the extraction reaction and the UNIFACgroup interaction parameters were obtained, which can be used in the whole concentration range.The equilibrium concentration of lathanum in this system can be calculated successfully.

Key words: Solvent extraction, Thermodynamics, UNIFAC equation, Pitzer equation, Extraction of lathanum

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CHEN Jian, CONG Wei, LI Zong-Cheng, LI Yi-Gui . An Application of UNIFAC Equation to H₂O-n-C₁₂H₂₆-D₂EHPA-LaCl₃-HCl Extraction System[J]. Chem. J. Chinese Universities, 1993, 14(3): 382.

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An Application of UNIFAC Equation to H₂O-n-C₁₂H₂₆-D₂EHPA-LaCl₃-HCl Extraction System

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