Recent Research Development in Solvent Extraction. Extraction of Lithium lon with Novel Lipophilic Phthalocyanine Derivatives.

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  • KONDO KAZUO
    Department of Chemical Engineering and Materials Science, Doshisha University
  • MATSUMOTO MICHIAKI
    Department of Chemical Engineering and Materials Science, Doshisha University
  • YOSHIDA TAKASHI
    Department of Chemical Engineering and Materials Science, Doshisha University
  • SONODA TAKAAKI
    Department of Molecular Science and Technology, Graduate School of Engineering Sciences, Kyushu University

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  • 溶媒抽出の新展開　　新規親油性フタロシアニン誘導体によるリチウムの抽出
  • シンキ シン ユセイ フタロシアニン ユウドウタイ ニ ヨル リチウム ノ チュウシュツ

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New types of lipophilic phthalocyanine derivatives, that is, hexadeca (2, 2, 2-trifluoroethoxy) phthalocyanine and hexadeca (2, 2, 3, 3, 3-pentafluoro-propoxy) phthalocyanine (abbreviated as H2Pc (TFE) 16 and H2Pc (PFP) 16, respectively), were prepared for selective extraction of lithium.<BR>The extraction equilibria of alkali metals with H2Pc (TFE) 16 and H2Pc (PFP) 16 (H2R) were measured at 303 K. Both the extractants showed the selectivity for lithium extraction in a high pH region. The dependency on pH of the extractability of the alkali metals differed for each metal. The extracted complex of sodium is estimated to be H2RNa+Cl-, and those of lithium are estimated to be Li2R andLiHR for H2Pc (TFE) 16 and Li2R for H2Pc (PFP) 16, respectively. The extracted species of potassium is estimated to be K2Pc (TFE) 16. Each extraction equilibrium constant for alkali metals with the extractants was calculated.<BR>The extraction rate of lithium with K2Pc (TFE) 16 was measured by using a stirred transfer cell. The extraction process is considered to be limited by the diffusion of the extractant.

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