Studies on the Extraction of Soft Acid Metal Species Using MIDOA and Analogous Compounds

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Abstract

The extractant, methylimino-bis-<i>N,N'</i>-dioctylacetamide (MIDOA), was used for the extraction of soft acid metals. It was found that MIDOA can extract not only Cr(VI), Mo(VI), W(VI), Tc(VII) and Re(VII), whose metals can form oxonium anions due to their high oxidation states, but also other metal cations, like Nb(V), Ta(V) and Pd(II). Analogous compounds, imino-bis-<i>N,N'</i>-dioctylacetamide (IDOA) and methylimino-bis-<i>N,N'</i>-di-2-ethylhexylacetamide (MIDEHA), were synthesized and compared for their extractability. It is clear that these extractants have almost the same or lower <i>D</i> values than those for MIDOA. In order to examine the effect on extractability with different donor atoms, TODGA (<i>N,N,N',N'</i>-tetraoctyl-diglycolamide) and TDGA (<i>N,N,N',N'</i>-tetraoctyl-tyiodiglycolamide) having oxygen and sulfur donor were employed. The comparison of their extractabilities suggests that the trend of Pd and Re extraction is N > S > O and N > O > S, respectively. The chemical stability and the structure of MIDOA were also studied and discussed in this paper.

Journal

  • Solvent Extraction Research and Development, Japan

    Solvent Extraction Research and Development, Japan 22(1), 37-45, 2015

    Japan Association of Solvent Extraction

Codes

  • NII Article ID (NAID)
    130005071500
  • NII NACSIS-CAT ID (NCID)
    AA11114608
  • Text Lang
    ENG
  • ISSN
    1341-7215
  • NDL Article ID
    026425435
  • NDL Call No.
    Z63-C428
  • Data Source
    NDL  J-STAGE 
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