【摘要】 研究了二 - (2 -乙基己基 )二硫代磷酸 (D2 EHDTPA)从高氯酸介质中萃取钯的热力学 .通过考察二 - (2 -乙基己基 )二硫代磷酸浓度对 Pd( )的影响 ,测出了萃取反应的表观平衡常数 K、焓变ΔH、自由能变ΔG和熵变ΔS.更多还原

【Abstract】 In this paper thermodynamics of the extractin of palladium with di 2 ethylexyldithiophosphoric acid(D 2EDTAP) from perchloric acid medium is studied. By investigaing the influeneces of temperature and [HL] upon the distribution ratio D of Pd(Ⅱ), it is concluded that when the initial concentrtion of ClO - 4 is 0 1 mol/L,the relationship between lg D and lg[HL] at 25℃ is represented as lg D =1 924lg[HL]+5.357 and that when the initial concentration of [HL] and pH are 1 0×10 -3 mol/L and 0 80 respectively, the relationship between lg D and 1/ T is shown as lg D =-422 1/ T -2 888. The values of thermodynamic function at 25℃ are as follows: K ex =22 75;Δ H =8 47 kJ/mol;Δ G =-7 47 kJ/mol;Δ S =53 44 J/(mol·K).更多还原