在高氯酸介质中P538萃取钯热力学的研究

STUDY ON THERMODYNAMICS OF EXTRACTION OF PALLADIUM WITH P538

研究了 P538从高氯酸体系萃取钯的热力学。通过考察 P538浓度和温度对 Pd( )分配比的影响 ,测出了萃取反应的表观平稳常数 K、焓变ΔH、自由能变Δ G和熵变ΔS。

Studied here is the thermodynamics of extraction of palladium with P538 from perchloride acid medium.By investigating the influences of temperature and [P538] upon the distribution ratio D of Pd(Ⅱ),it is concluded that when the initial concentration of Cl - 4 is 0.01 mol/L, the relationship between lg D and lg[P538] at 25℃ is represented as lg D =1.932 lg[P538]+7.309 and when the initial concentration of P538 and pH are 1.0× -3 mol/L and 0.85 respectively,the relationship between lg D and 1/ T is shown as lg D = A / T -3.819 A =1 619K The values of thermodynamic functions at 25℃ are as follows: K =4.06×10 5, ΔG =-32.01 kJ/mol, ΔH =-31.00 kJ/mol, ΔS =3.39 J/(mol·K) [WT5HZ]