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本文研究了2-乙基已基磷酸单（2-乙基已基）酯（P507）萃取钯（Ⅱ）的热力学过程．通过考察P507浓度对Pd（Ⅱ）分配比的影响，调出了萃取反应的表观平衡常数k、焓变△H、自由能变△G和熵变△S．
In this paper, the thermodynamic process of palladium (Ⅱ) extraction with 2-ethylhexyl phosphate mono (2-ethylhexyl) phosphate (P507) was studied. The apparent equilibrium constant k, enthalpy change △ H, free energy change △ G and entropy change △ S were extracted by investigating the influence of P507 concentration on Pd (Ⅱ) partitioning ratio.