Synergistic extraction of rare-earth elements by tri-n-octylmethylammonium nitrate and .BETA.-diketone.
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概要
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The synergistic extraction of rare-earth nitrates was studied, using tri-<I>n</I>-octylmethylammonium nitrate (TOMAN) and <I>β</I>-diketone(<I>α</I>-acetyl-<I>m</I>-dodecylacetophenone: LIX54 and <I>α</I>-perfluoro-alkanoyl-<I>m</I>-dodecylacetophenone: LIX51) in xylene as extractants and ammonium nitrate as salting-out agent. The capability of this mixed extractant is essentially identical to that of TOMAN alone in the range of pH = 2–3. with increasing pH a strong synergism appeared, and the degree of adduct complex formation became greater with position in the atomic number series. The extraction of heavier element is, thus, most favored at pH = 6 and least favored at pH = 2. The mixed adducts involved in the extraction were identified as <span style="text-decoration: overline;">Ln(NO</span><SUB>3</SUB>)<SUB>2</SUB><span style="text-decoration: overline;">R·5S</span>, <span style="text-decoration: overline;">Ln(NO</span><SUB>3</SUB><span style="text-decoration: overline;">)R</span><SUB>2</SUB><span style="text-decoration: overline;">·4S</span> and their aggregates as <span style="text-decoration: overline;">Ln(NO</span><SUB>3</SUB>)<SUB>3</SUB><span style="text-decoration: overline;">Ln(NO</span><SUB>3</SUB>)<SUB>2</SUB><span style="text-decoration: overline;">R·5S</span> and <span style="text-decoration: overline;">Ln(NO</span><SUB>3</SUB>)<SUB>3</SUB><span style="text-decoration: overline;">Ln(NO</span><SUB>3</SUB><span style="text-decoration: overline;">)R</span><SUB>2</SUB><span style="text-decoration: overline;">·4S</span>, where R: anion of <I>β</I>-diketone and S: monomer of TOMAN. The fraction of adducts containing two molecules of <I>β</I>-diketone increases with increasing atomic number of the element.
- The Society of Chemical Engineers, Japanの論文
著者
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Komasawa Isao
Department Of Chemical Engineering Faculty Of Engineering Science Osaka University
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Miyamura Makoto
Department of Chemical Engineering, Osaka University
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