Solvent Extraction of Indium,Gallium, and Zinc Ions with Acidic Organophosphates having Bulky Alkyl Groups |
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| Authors: | Takahide Nakamura Asami Sakai Kazuharu Yoshizuka |
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| Affiliation: | Department of Chemical Engineering , The University of Kitakyushu , Hibikino 1‐1, Kitakyushu 808‐0135, Japan |
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| Abstract: | The extraction equilibria of In3+, Ga3, and Zn2+ with bis(4‐ethylcyclohexyl)phosphoric acid (D4ECHPA), bis(4‐cyclohexylcyclohexyl)phosphoric acid (D4DCHPA), and bis(2‐ethylhexyl)phosphoric acid (D2EHPA) were investigated in acidic aqueous sulfate media. The order of extractability of metal ions is D4DCHPA > D2EHPA > D4ECHPA, which corresponds to the lipophilicity (log P) of the extractants. The separation factors, β(In/Ga) and β(Ga/Zn), of D4ECHPA and D4DCHPA are greater or comparable than that of D2EHPA, because of the steric hindrance of the bulky cyclohexyl groups. In3+ can be therefore separated from simulated liquor containing a high concentration of Zn2+ by D4DCHPA. |
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| Keywords: | Solvent extraction vanadium(V) 4‐acylbis(1‐phenyl‐3‐methyl‐5‐pyrazolones) steric effects synergistic effects neutral organophosphorus extractants |
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