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

Mihab M. Murad, Takashi Hayashita, Kazuki Shigemori, Seiichi Nishizawa, Norio Teramae

研究成果: Article査読

22 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)1185-1189
ページ数5
ジャーナルanalytical sciences
15
12
DOI
出版ステータスPublished - 1999 12

ASJC Scopus subject areas

  • 分析化学

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