HPMBP与N_（503）协同萃取钯（Ⅱ）的研究

Mechanism of synergistic extraction palladium with HPMBP and N_(503)

研究了ＨＰＭＢＰ与Ｎ５０３的氯仿溶液从硝酸介质中协萃钯（Ⅱ）的性能．用斜率法和等摩尔系列法确定萃合物组成为（ＣＨ３ＣＯＮＨＲ２）Ｐｄ（ＰＭＢＰ）３；求得该协萃反应的平衡常数及协萃配合物的生成常数分别为：ｌｇｋ１２＝１．５４，ｌｇβ１２＝２．３９．考察了温度对协萃平衡的影响，测定了协萃反应的热力学函数．

The mechnaism of synergistic extraction of Pd(Ⅱ)from nitric acid solution with HPMBP (1-mpheny1-3-methy1-4-benzoyl-mppyrazolone-5-one) and N503 (dicl-methylhepthyl acetamide) in CHCl3 are studied. The results show that HPMBP and N503 has an apparent synergistic effect on Pd(Ⅱ), and the synergistic constant R is 3. 2. By investigating the influence of concentration of HPMBP, N503 pH values and temperture on the distribution radio D12, the composition of the extracted complexes is (CH3CONR2H)Pd (PMBP)3 determined by the methods of slope and constant mole. The synergistic extraction reaction have beed represented as follow:The equilibrium constant of synergistic extraction and additional reaction of Pd (Ⅱ) at 30±1 ℃ are calulated to be lgK12=1. 54, lgβ12=2. 39. The values of thermodynamic function at 30±1℃ are as follows: ΔH=-8. 32kJ. mol-1;ΔG=-8. 93kJ·mol-1;ΔS=2. 01J·mol-1·K-1.