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

HMO D26 D2Q between supercritical （SF） CO D22 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 D22 D2 were investigated。Furthermore，与SFCO-D22-D2接触的酸性溶液的pH值是评估的光谱光度计。以下pH值为3，与SFCO-D22-D2接触的相对溶液的pH值变化相对较小，但高于pH值为3，相对相位的pH值水平约为3，分布常数。（K2-methyl-5-hexyloxymethyl-8-quinolinol（HMO-D26-D2Q）bet·SF CO·D22 and water increased with an increase in the SF CO·D22 pr #。对于heptane-water system的K2 value at 45 C and 20.4 MPa was about one tenth of the K2 D2 value。Ga（III） was extracted with HMO D26 y D2Q into SFCO D22 y D2 as Ga（OH）（MO D26 y D2Q）y D22 y D2。The extractability increases with an increment of the SF CO的D22。Ga（III） was completely separated from Al（II） with HMOイイD26イD2Q at 45 C and 10 MPa。The extractability of Pd（II） with HMQ from a weakly acidic solution into SF COイD22イイD2 was remarkably affected by the ClイD1-イD1 andイD1+イエD1 concentrations。Pd（II） should be extracted with HMQ as Pd（MQ）イイD22エD2 from a weakly acidic solution。On the other hand， the Pd（II） complex extracted from the higher HCl concentration was H-D22 PdCl-D24-D2。Proposed method can be potential technique for the selective separation of metals such as Pd（II）。

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).