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).

HMOD26D2Q 在超临界 (SF) CO2D22D2 和水之间的分布行为以及 Ga(III) 和 Pd(II) 与 2-甲基-8-羟基喹啉衍生物从酸性溶液中萃取到 SF COD22D2 中的行为此外，还研究了 pH 值。通过分光光度法评估酸性溶液与 SF COD22D2 接触的影响。低于 pH 值如图3所示，与SF CO2D22D2接触的水溶液的pH变化小到可以忽略不计，但在pH 3以上，水相的pH值趋于3左右。2-甲基-5-己氧基甲基-的分布常数(K2D2D2 D2) SF CO D22 D2 和水之间的 8-羟基喹啉 (HMO D26 D2Q)随着 SF CO2D22 压力的增加，在 45°C 和 20.4 MPa 下，K2D2D2 值约为庚烷-水体系 K2D2D2 值的十分之一。用 HMOD26D2Q 将 Ga(III) 萃取到 SFCOD22D2 中。 Ga(OH)(MOD26D2Q)D22D2 的萃取率随着 SF COD22 压力的增加而增加，HMO2D26D2Q 在 45°C 和 10 MPa 下将 Ga(III) 与 Al(II) 完全分离。用 HMQ 从弱酸性溶液进入 SF COD22D2 受到 ClD1-D1 和 HD1+D1 浓度的严重影响，应使用 HMQ 将 Pd(MQ)D22D2 从弱酸性溶液中提取出来。 HCl 浓度较高HD22D2PdClD24D2。所提出的方法可以成为选择性分离Pd(II)等金属的潜在技术。