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In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is...
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Deciphering the Third Phase Structure in Uranium Extraction with Aliphatic Amines Using Combined Small-Angle X-ray

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Organic phase demixing in uranium extraction is clarified. Uranium-loaded aggregates cause phase separation, forming clusters in the third phase, impacting liquid-liquid extraction efficiency.

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Area of Science:

  • Chemical Engineering
  • Materials Science
  • Nuclear Chemistry

Background:

  • Organic phase demixing hinders liquid-liquid extraction efficiency.
  • Understanding demixing mechanisms is crucial for process optimization.
  • Uranium extraction using aliphatic amines is sensitive to phase behavior.

Purpose of the Study:

  • Investigate the mechanisms of organic phase demixing in uranium extraction.
  • Characterize the multiscale structure of demixed organic phases.
  • Determine the extractant phase stability threshold.

Main Methods:

  • Small-angle X-ray scattering (SAXS) for structural analysis.
  • Small-angle neutron scattering (SANS) for microstructure characterization.
  • Determination of extractant phase stability threshold.

Main Results:

  • The third phase consists of water-in-oil (w/o) aggregates with interdigitated hydrocarbon chains.
  • The lighter phase contains monomeric amines and amine-water aggregates.
  • Uranium-loaded aggregates exhibit stronger attractive interactions, leading to segregation and cluster formation.

Conclusions:

  • Phase demixing results from the segregation of uranium-loaded aggregates into large clusters.
  • SAXS detects this clustering via a Porod-type decay at low q-values.
  • This study elucidates key mechanisms of phase separation in uranium extraction systems.