Efficient Ion-Pair Extraction of Potassium Chloride from Aqueous Phase into Nitrobenzene Containing Dicyclohexyl-18-crown-6 as Cation Binder and Diphenylthiourea as Anion Binder.

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  • MURAD Mihab M.
    Department of Chemistry, Graduate School of Science, Tohoku University
  • HAYASHITA Takashi
    Department of Chemistry, Graduate School of Science, Tohoku University
  • SHIGEMORI Kazuki
    Department of Chemistry, Graduate School of Science, Tohoku University
  • NISHIZAWA Seiichi
    Department of Chemistry, Graduate School of Science, Tohoku University
  • TERAMAE Norio
    Department of Chemistry, Graduate School of Science, Tohoku University

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Abstract

In combination with an ion pair extraction of potassium salts by dicyclohexyl-18-crown-6 (DC18C6), extraction behavior of anions with a diphenylthiourea (DPTU) from aqueous phase into nitrobenzene has been examined. The extraction selectivity of potassium salts follows a Hofmeister series: NO3->Br->Cl->OAc-. The extractability of KCl by DC18C6 is significantly enhanced upon the addition of DPTU in organic solution. The slope analysis of the extraction equilibrium reveals a 1:1 complex formation between DPTU and Cl-. The hydrogen-bonding interaction of DPTU with Cl- is confirmed by the 1H NMR analysis in d5-nitrobenzene. For qualitative evaluation, solid-liquid extraction of KCl into d5- nitrobenzene containing DPTU and DC18C6 has been examined by 1H NMR analysis. Similar to the liquid-liquid extraction, an efficient synergistic effect of DPTU for the extraction of KCl is clarified.

Journal

  • Analytical Sciences

    Analytical Sciences 15 (12), 1185-1189, 1999

    The Japan Society for Analytical Chemistry

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