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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Consider a ternary system, which is composed of three components: water (W), ethanoic acid (E), and trichloromethane (T). Here, Ethanoic acid (E) is fully miscible with both water (W) and trichloromethane (T), meaning it can mix entirely with either of them. However, water and trichloromethane have partial miscibility, meaning they can only mix to a certain extent, beyond which two separate phases will form.The phase diagram of a ternary system is represented as an equilateral triangle, where...
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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Recrystallization: Solid–Solution Equilibria01:10

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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Energetics of Solution Formation02:35

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The formation of a solution is an example of a spontaneous process, which is a process that occurs under specified conditions without energy from some external source.
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The Colloidal State01:29

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The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
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Pretransitional Multiscale Structure Preceding Third-Phase Formation in Solvent Extraction Systems.

E Guerinoni1, Y Ueda2, R Motokawa2

  • 1ICSM, Univ Montpellier, CEA, CNRS, ENSCM, 30207 Bagnol sur Cèze, France.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 20, 2026
PubMed
Summary
This summary is machine-generated.

Third-phase formation in liquid-liquid extraction is caused by hierarchical condensation of water and uranium aggregates. Understanding these structures helps predict and prevent phase separation in nuclear fuel recycling.

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Area of Science:

  • Chemical Engineering
  • Materials Science
  • Nuclear Engineering

Background:

  • Third-phase formation in liquid-liquid extraction complicates processes, reducing efficiency and safety.
  • This phenomenon is particularly relevant in nuclear fuel recycling.

Purpose of the Study:

  • To elucidate the pretransitional structures leading to third-phase formation during uranium extraction.
  • To understand the role of aggregate formation and water in phase instability.

Main Methods:

  • Combined ultrasmall-angle X-ray scattering (USAXS) and ultrasmall-angle neutron scattering (SANS).
  • Analysis of uranium extraction by trioctylamine (TOA) in octane.
  • Investigation across a wide scattering vector (q) range (0.004 to 3 Å⁻¹).

Main Results:

  • Identified two distinct aggregate populations: small, reverse micelle-like structures (radius ~11 Å) and large, fluctuating nanodomains (>150 nm).
  • Observed amplification of nanodomains with increasing TOA concentration, preceding phase separation.
  • Demonstrated that phase instability arises from hierarchical condensation around uranium-loaded aggregates, including water.

Conclusions:

  • Phase separation in solvent extraction is driven by multiscale phenomena, not just simple micelle growth.
  • Accurate prediction of instability requires considering all species, including water.
  • Findings offer new strategies to mitigate phase separation in critical industrial processes like nuclear fuel recycling.