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Extraction Behavior of Palladium(II) with Chelate Ligands into Supercritical COィイD22ィエD2

超临界 COD22D2 中螯合配体对钯 (II) 的萃取行为

基本信息

批准号：
09440250
负责人：
OHASHI Kousaburo
金额：
$ 6.46万
依托单位：
IBARAKI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

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).

研究了超临界（SF） CO (γ) γ (γ) γ (γ) γ (γ) γ (γ) γ (γ) γ (γ) γ (γ) γ (γ) γ (γ) γ (γ) γ (γ) γ (γ) γ (γ) γ (γ) γ (γ) γ (γ) γ (γ) γ (γ) γ (γ) γ (γ) γ (γ) γ (γ) γ (γ) γ (γ) γ。此外，用分光光度法测定了与SF CO μ d接触的酸性溶液的pH值。pH值低于3时，与SF CO φ 22 φ D2接触的水溶液pH值变化可忽略不计，而pH值高于3时，水相pH值趋于稳定，约为3。2-甲基-5-己基氧基甲基-8-喹啉醇（HMO）在水与水之间的分布常数（K′′d′d′d′d′d′d′）随着水压力的增大而增大。在45℃和20.4 MPa条件下，正庚烷-水体系的K D2D D2约为K D2D D2值的十分之一。Ga（III）经HMO γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ。萃取率随萃取压力的增加而增加。在45˚C和10 MPa条件下，用HMO γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ。在弱酸性溶液中，用HMQ萃取Pd（II）的能力受Cl - D1和H - D1+ D1浓度的显著影响。Pd（II）用HMQ从弱酸性溶液中提取为Pd(MQ) φ 22 φ D2。另一方面，在较高的HCl浓度下，Pd（II）络合物为H′′φ D22′′φ D2PdCl′′φ D24′′φ D2。该方法可作为Pd（II）等金属的选择性分离技术。