HPMBP和N_(503)协萃钯(Ⅱ)的研究

Themodynamics study on the synergistic extraction of Pd(Ⅱ) with HPMBP and N_(503)

研究螫合萃取剂1—苯基—3—甲基—4—苯甲酰吡唑酮—5(HPMBP)与酰胺型革取剂N_(503)氯仿溶液从硝酸介质中协萃钯(Ⅱ)的热力学行为。在30℃、pH=1.70条件下,萃取剂浓度与分配比的关系式可表达为lgD′=2.948lg[HPMBP]_((o))+6.645,lgD″=0.9809lg[N_(503).HNO_3]_((0))+2.796。温度与分配比的关系表达为lgD=424.923/T-0.3088。测得协革平衡常数k=34.67,焓变△H=-8.316kJ.mol^(-1),自由能变△G=-8.932kJ.mol^(-1)和熵变△S=2.036J.mol^(-1).K^(-1).

Themodynamics behaviour on the synergistic extraction of Pd (Ⅱ) from nitric acid solution with HPMBP and N_(503) have been studied. By investigating the influences of the concentration of HPMBP or N_(503) and the temperature on the distribution ratio D, the relationships are established at 30℃ and pH=1.70, it is represented as: igD'=2.948lg[HPMBP]_(0)+6.645, lgD″=0.9809lg[N_(503). HNO_3](0)+2.796. and under the same conditions, the relationship between distribution ratio D and temperature T is show as: lgD=424.9/T—0.3088 The values of themodynamic function are calculated at 30℃. The results are as follows: k=34.67, △H=-8.316kJ, mol^(-1), △G=-8.923kJ, mol^(-1), △S=2.036J.mol^(-1).k^(-1),