1999 Fiscal Year Final Research Report Summary
Extraction Behavior of Palladium(II) with Chelate Ligands into Supercritical COィイD22ィエD2
| Project/Area Number |
09440250
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
分離・精製・検出法
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| Research Institution | IBARAKI UNIVERSITY |
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Principal Investigator |
OHASHI Kousaburo IBARAKI Univ. Fuc. of Science, Professor, 理学部, 教授 (60007763)
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| Co-Investigator(Kenkyū-buntansha) |
ORIYAMA Takeshi IBARAKI Univ. Fuc. of Science, Asociate Professor, 理学部, 助教授 (90185687)
IMURA Hisanori IBARAKI Univ. Fuc. of Science, Professor, 理学部, 教授 (60142923)
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| Project Period (FY) |
1997 – 1999
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| Keywords | Supercritical / Carbon dioxide / alkylated 2-methy-8-quinolinol / Palladium(II) / Extraction constant / Distribution constant / Gallium(III) / 分配定数 |
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| Research Abstract |
The distribution behavior of HMOィイD26ィエD2Q between supercritical (SF) COィイD22ィエD2 and water and the extraction behavior of Ga(III) and Pd(II) with 2-methyl-8-quinolinol derivatives from an acidic solution into SF COィイD22ィエD2 were investigated. Furthermore, the pH of an acidic solution contacting with SF COィイD22ィエD2 was evaluated spectrophotometrically.
Below pH 3, the pH change of the aqueous solution contacting with SF COィイD22ィエD2 is negligibly small, but above pH 3, the pH of the aqueous phase was levelled to about 3.
The distribution constant (KィイD2DィエD2) of 2-methyl-5-hexyloxymethyl-8-quinolinol (HMOィイD26ィエD2Q) between SF COィイD22ィエD2 and water increased with an increase in the SF COィイD22ィエD2 pressure. The KィイD2DィエD2 value at 45゜C and 20.4 MPa was about one tenth of the KィイD2DィエD2 value for heptane - water system.
Ga(III) was extracted with HMOィイD26ィエD2Q into SFCOィイD22ィエD2 as Ga(OH)(MOィイD26ィエD2Q)ィイD22ィエD2. The extractability increases with an increment of the SF COィイD22ィエD2 pressure. Ga(III) was completely separated from Al(II) with HMOィイD26ィエD2Q at 45゜C and 10 MPa.
The extractability of Pd(II) with HMQ from a weakly acidic solution into SF COィイD22ィエD2 was remarkably affected by the ClィイD1-ィエD1 and HィイD1+ィエD1 concentrations. Pd(II) should be extracted with HMQ as Pd(MQ)ィイD22ィエD2 from a weakly acidic solution. On the other hand, the Pd(II) complex extracted from the higher HCl concentration was HィイD22ィエD2PdClィイD24ィエD2.
The proposed method can be potential technique for the selective separation of metals such as Pd(II).
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