Synergistic Extraction of Organic Acids with Tri-n-Octylamine and Di-2-Ethylhexylphosphoric Acid

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The equilibria of organic acids (acetic, glycolic, propionic, lactic, butyric, pyruvic, tartaric, succinic, fumaric, L-malic, itaconic and citric, HA) extracted with tri-<I>n</I>-octylamine (TOA) and di-2-ethylhexylphosphoric acid (D2EHPA, HR) were measured. Synergism was observed in the extraction of all acids investigated when a mixed extractant of TOA and D2EHPA was used, while the extraction ability of TOA or D2EHPA alone was negligible under the experimental conditions. In the synergistic system, the distribution ratio of the acids plotted against the D2EHPA concentration showed a bell shape. FT-IR spectrum of the mixed extractant suggested that TOA and D2EHPA interacted. From these results, we estimated that TOA·HR and TOA·(HR)<SUB>2</SUB> were the active and inactive species for the acid extraction, respectively, and that the extracted species was HA·TOA·HR. The calculated distribution ratios of organic acids showed good agreement with the experimental results. The obtained synergistic extraction equilibrium constants roughly correlated with the hydrophobicity of each acid.

収録刊行物

  • Journal of chemical engineering of Japan

    Journal of chemical engineering of Japan 37(9), 1150-1154, 2004-09-01

    公益社団法人 化学工学会

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各種コード

  • NII論文ID(NAID)
    10013576862
  • NII書誌ID(NCID)
    AA00709658
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00219592
  • NDL 記事登録ID
    7091408
  • NDL 雑誌分類
    ZP1(科学技術--化学・化学工業)
  • NDL 請求記号
    Z53-R395
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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