Sulfonic acids: Catalysts for the liquid-liquid extraction of metals

K. Osseo-Asare, M. E. Keeney

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73 Scopus citations


Three sulfonic acid extractants, dinonylnaphthalene sulfonic acid (HDNNS), didodecylnaphthalene sulfonic acid (HDDNS) and di-(2-ethylhexyl) sodium sulfosuccinate (Aerosol OT, AOT) are compared as to their effects on the extraction of nickel with LIX63. The acidic extractants interact synergistically with the oxime. Interfacial tension results are presented which demonstrate that the sulfonates form reversed micelles in non-polar organic solvents. It is proposed that the reversed micelles catalyze the extraction by specific solubilization of both the metal and the extractant, resulting in an increase in the interfacial concentration of the reacting species. The ability of LIX63 to chelate with nickel without deprotonating permits the synergism to occur at low pH.

Original languageEnglish (US)
Pages (from-to)999-1011
Number of pages13
JournalSeparation Science and Technology
Issue number4
StatePublished - May 1 1980

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering
  • Process Chemistry and Technology
  • Filtration and Separation


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