Evaluation of tri-n-octylamine oxide as phenol extractant in a solvent impregnated resin

B. Burghoff, R. Cuypers, M. van Ettinger, E.J.R. Sudhölter, H. Zuilhof, A.B. de Haan

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19 Citations (Scopus)


Tri-n-ocytlamine oxide (TOAO) is evaluated as alternative to the state-of-the-art phenol extractants tri-n-octylphosphine oxide (TOPO) and Cyanex 923. Liquid¿liquid equilibrium experiments show that TOAO in 1,3-dimethylnaphthalene achieves higher phenol distribution coefficients in an extractant concentration range of 0.1¿1.25 mol L¿1 than respective TOPO/1,3-dimethylnaphthalene or Cyanex 923/1,3-dimethylnaphthalene solutions. In a solvent impregnated resin (SIR) application, the SIRs impregnated with TOAO/1,3-dimethylnaphthalene have a higher phenol capacity than the SIRs impregnated with Cyanex 923/1,3-dimethylnaphthalene. Regeneration of the SIRs with alkaline solution of pH 13 shows that both SIRs maintain a constant phenol capacity during at least seven cycles. Based on these observations TOAO can be considered as a better alternative to Cyanex 923
Original languageEnglish
Pages (from-to)117-120
JournalSeparation and Purification Technology
Issue number1
Publication statusPublished - 2009


  • aqueous-solutions
  • removal
  • water
  • acid


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