Extraction Mechanism of Rare Earths with Sec-Octylphenoxy Acetic Acid by Two-Phase Titration Technique

稀土学报(英文版), 2002, 20(5): 416-419.

1.Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;Department of Chemistry, South China Normal University, Guangzhou 510631, China

2.Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

3.Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

4.Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

基金项目: 科技部重点项目(G1998061302) 国家自然科学基金(29771028,29801004)

Extraction Mechanism of Rare Earths with Sec-Octylphenoxy Acetic Acid by Two-Phase Titration Technique

Keywords： rare earths

The compositions of the extracted complexes of La, Gd, Er and Y with sec-octyl-phenoxy acetic acid in heptane and the related apparent extraction equilibrium constants KM were determined using two-phase titration technique. The stoichiometric compounds for La, Gd, Er and Y should be LaA3*2.5HA, GdA3*3HA, ErA3*3.1HA and YA3*4.3HA respectively. And their pKM are 3.43, 3.46, 3.08 and 2.58 respectively.

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Extraction Mechanism of Rare Earths with Sec-Octylphenoxy Acetic Acid by Two-Phase Titration Technique

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