DISSOCIATION RATES OF VARIOUS HEAVY RARE EARTH METAL-DIETHYLENETRIAMINEPENTAACETIC ACID COMPLEXES

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著者

    • AZIS Abdul
    • Department of Chemistry and Materials Technology, Kyoto Institute of Technology
    • MATSUYAMA Hideto
    • Department of Chemistry and Materials Technology, Kyoto Institute of Technology
    • TERAMOTO Masaaki
    • Department of Chemistry and Materials Technology, Kyoto Institute of Technology

抄録

In relation to the separation of rare earth metal ions (M<SUP>3+</SUP>) by solvent extraction in the presence of diethylenetriaminepentaacetic acid (DTPA) in an aqueous phase, the rate of dissociation of rare earth metal-DTPA complex, i.e., MDTPA<SUP>2–</SUP> + 2H<SUP>+</SUP> ↔ M<SUP>3+</SUP> + H<SUB>2</SUB>DTPA<SUP>3–</SUP>, was determined by the analysis of the rate of exchange reaction between MDTPA<SUP>2–</SUP> and Eu<SUP>3+</SUP>, which is described by MDTPA<SUP>2–</SUP> + EU<SUP>3+</SUP> ↔ EuDTPA<SUP>2–</SUP> + M<SUP>3+</SUP> (MDTPA<SUP>2–</SUP>; DyDTPA<SUP>2–</SUP>, HoDTPA<SUP>2–</SUP>, TmDTPA<SUP>2–</SUP>). The exchange rate could be expressed by the following equation and the parameters <I>α</I>, <I>β</I> and <I>γ</I> in the equation were determined.<BR><BR>Rate = <I>α</I>[MDTPA<SUP>2–</SUP>][H<SUP>+</SUP>]<SUP>2</SUP> + <I>β</I>[MDTPA<SUP>2–</SUP>] [EU<SUP>3+</SUP>] + <I>γ</I>[MDTPA<SUP>2–</SUP>][H<SUP>+</SUP>][EU<SUP>3+</SUP>]<BR><BR>A method for estimating approximate values of <I>α</I>, that is, the rate constants of proton-catalyzed dissociation of MDTPA<SUP>2–</SUP> for various rare earth metals was proposed. Based on the dissociation rate constants of DTPA complexes obtained, selectivities in solvent extraction in the presence of DTPA were estimated for various cases.

収録刊行物

  • Journal of chemical engineering of Japan  

    Journal of chemical engineering of Japan 28(3), 334-339, 1995-06 

    The Society of Chemical Engineers, Japan

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各種コード

  • NII論文ID(NAID)
    10002133874
  • NII書誌ID(NCID)
    AA00709658
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00219592
  • データ提供元
    CJP書誌  CJP引用  J-STAGE 
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