Extraction of lanthanoids from hydrochloric and nitric acid solutions by di(2-ethylhexyl)phosphoric acid.
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概要
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Di(2-ethylhexyl) phosphoric acid<SUP>+</SUP> (D2EHPA or HX) extracts lanthanoids (Ln) from a moderately acidic solution by cation exchange reaction: Ln<SUP>3+</SUP>+<I>m</I>(HX)<I><SUB>n</SUB></I>\rightleftarrowsLnX<SUB>3</SUB>·3HX+3H<SUP>+</SUP>. From the mode of extraction <I>m</I> is estimated to be 3 in benzene diluent, and smaller than 3 in heptane diluent. The change of the relative extractability with the atomic number of lanthanoids is in line with what is expected from the concept of the tetrad effect proposed by Peppard <I>et al.</I> When the hydrogen ion concentration is very high, the main reaction is solvation: Ln<SUP>3+</SUP>+3A<SUP>−</SUP>+<I>q</I>(HX)<I><SUB>n</SUB></I>\rightleftarrowsLnA<SUB>3</SUB>·4HX. In benzene diluent <I>q</I> is 2 and <I>n</I> is 2, while <I>q</I> is 1.6–1.7 in heptane diluent. It can be attributed to the difference in the association degree of D2EHPA that <I>m</I> or <I>q</I> is smaller in heptane than in benzene.
- 公益社団法人 日本化学会の論文
著者
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YAMAMOTO Yasuhiro
Department of Chemistry, Faculty of Science, Toho University
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Takagi Shigeru
Department Of Chemistry Nagoya Institute Of Technology
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Shiokawa Jiro
Department of Applied Chemistry, Faculty of Engineering, Osaka University
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Hirashima Yoshiyuki
Department of Applied Chemistry, Faculty of Engineering, Osaka University
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Amano Taisuke
Department of Applied Chemistry, Faculty of Engineering, Osaka University
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Takagi Shigeru
Department of Applied Chemistry, Faculty of Engineering, Osaka University
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