Thermodynamics of extraction of RE O4 - from aqueous sulfuric acid media with Tri-n-butyl phosphate dissolved in kerosene

Sadrnezhaad, S. K ; Sharif University of Technology | 2001

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  1. Type of Document: Article
  2. DOI: 10.1007/s11663-001-0001-2
  3. Publisher: 2001
  4. Abstract:
  5. Rhenium distribution between Tri-n-butyl phosphate (TBP) dissolved in kerosene and sulfuric aqueous media is investigated under different temperatures, acidities, and TBP concentrations. Results show an exothermic extraction reaction with a distribution factor that decreases with the increase of the temperature and increases with the increase of the acidity and the TBP concentration. The stoichiometry of the reaction indicates neutralization of 1 mole of H+ with 1 mole of ReO4- and solvating of a neutral molecule with four molecules of TBP. The structure of the complexes formed is, therefore, 4TBP · HReO4. The apparent Gibbs free energy of the formation of 4TBP · HReO4 from TBP, ReO4-, and H+ is determined to be equal to -66,989 + 219.8 T J/mole
  6. Keywords:
  7. Acidity ; Thermal effects ; Sulfuric acid ; Stoichiometry ; Solvent extraction ; Phosphates ; pH effects ; Molecular structure ; Gibbs free energy ; Kerosene ; Composition effects ; Complexation
  8. Source: Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science ; Volume 32, Issue 1 , 2001 , Pages 5-10 ; 10735615 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s11663-001-0001-2