Chemical equilibrium studies on the nickel sulfate-acetate buffer/β-alkyl-8-hydroxy-quinoline-xylene system

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Abstract

A thermodynamic equilibrium model is developed for the distribution of nickel between two phases for the system nickel sulfate-acetate buffer/β-alkyl-8-hydroxy quinoline in xylene. Chemical equilibrium data were obtained for the range of experimental parameters of [Ni]aq, i (0.00435 to 0.01740 mol/dm3), pH (3.90 to 4.95), extractant [HR]org, i (0.02 to 0.06 mol/dm3), and temperature (25 to 50°C). The best fit of the data results with the following equation: {Mathematical expression} The above analysis requires specification of the aqueous phase ionic concentrations which are analyzed by considering the pertinent species equilibria. Also, the stoichiometric coefficients of two for hydrogen ion and β-alkyl-8-hydroxy-quinoline are determined for the extraction reaction using aqueous phase modeling and a statistical fit of equilibrium data. The results indicate that the enthalpy of the reaction and the entropy change are 36.8 kJ/mol and 13.8 J/mol-K, respectively.

Original languageEnglish (US)
Pages (from-to)399-407
Number of pages9
JournalMetallurgical Transactions B
Volume18
Issue number2
DOIs
StatePublished - Jun 1987

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ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys
  • Materials Chemistry
  • Mechanics of Materials
  • Engineering(all)

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