Sorption and Separation of Metallic Ions by a Macromolecular Resin Impregnated with 2-Ethylhexyl Hydrogen-2-ethylhexylphosphonate

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  • TAKAHASHI Masahiro
    Department of Chemistry and Biochemistry, Suzuka National College of Technology; Shiroko-cho, Suzuka-shi 510-0294 Japan
  • YAMASHITA Yasuhiro
    Department of Chemistry and Biochemistry, Suzuka National College of Technology; Shiroko-cho, Suzuka-shi 510-0294 Japan Toyohashi University of Technology; 1-1 Hibarigaoka, Tenpaku-cho, Toyohasi-shi 441-8122 Japan
  • KOSAKA Satoru
    Department of Chemistry and Biochemistry, Suzuka National College of Technology; Shiroko-cho, Suzuka-shi 510-0294 Japan Toyota Central Research and Development Laboratories, Inc.; 41-1 Nagakute Yokomichi,Nagakute-cho, Aichi-gun, Aichi 480-1131 Japan

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Other Title
  • 2-エチルヘキシルホスホン酸水素2-エチルヘキシルを担持させた高分子吸着剤による金属イオンの吸着分離
  • 2 エチルヘキシルホスホンサン スイソ 2 エチルヘキシル オ タンジ サセタ コウブンシ キュウチャクザイ ニ ヨル キンゾク イオン ノ キュウチャク ブンリ

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Abstract

Studies have been conducted on the sorption equilibria of Zn(II), Mn(II), Cd(II), Cu(II), Co(II) and Sm(III) from aqueous media at low acidities by a macromolecular resin impregnated with 2-ethylhexyl hydrogen-2-ethylhexylphosphonate(2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester, EHPNA, HR). Sorption equilibria of these metallic ions(Mn+) on the macromolecular resin impregnated with EHPNA(EHPNA-impregnated sorbent) can be expressed by a simple ion exchange reaction which is different from solvent extraction with EHPNA.<PRE> __ __ Mn++nHR⇄MRn+nH+</PRE> The equilibrium constants Kex of Zn(II), Mn(II), Cd(II), Cu(II), Co(II) and Sm(III) were found to be 6.25×10-3, 4.0×10-5, 4.0×10-5, 3.1×10-5, 2.2×10-6kg-sor dm-3 and 7.69×10-3(kg-sor)2 dm-6, respectively.<BR>The separation factors defined by the ratios of the equilibrium constant of Zn(II)/ Cu(II), Zn(II)/ Mn(II) and Sm(III)/ Co(II) were 202, 156 and 3495, respectively.<BR>The mutual separation from the binary metal solutions of Zn(II)/ Cu(II), Zn(II)/ Mn(II) and Sm(III)/ Co(II) using the EHPNA-impregnated sorbent has also been studied in a column operation. It was found that the selective separation is attained satisfactorily by use of the sorbent.

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