N,N(二甲庚基)乙酰胺萃取钯的热力学

THERMODYNAMICS STUDY ON EXTRACTION OF PD(II) WITH N, N-DI(1-METHYL HEPTYL) ACETAMIDE

本文研究了N,N(二甲庚基)乙酰胺(N503)从盐酸体系中萃取钯的热力学。通过考察萃取剂浓度和温度对钯(Ⅱ)分配比的影响,测得该萃取反应的表观平衡常数K、焓变ΔH、自由能变ΔG和熵变ΔS。

Studied here is the thermodynamics in the extraction of PdCl42- with N, N-di (1-methyl heptyl) acetamide (N503) from hydrochloric acid medium.By investigating the influences of temperature and[N503]upon the distribution ratio D of Pd(II),, it is concluded that when the initial concentration of Cl- is 0.3 mol L-1, the relationship between logD and log[N503]at 30 is represented as logD = 1.9250log[N503] + 4.2170 and that when the initial concentration of[N503]and chloric ions are respectively 2.0 ×10-3mol L-1 and 0.3 mol L-1, the relationship between log D and 1/T at is shown as logD = 480. 87/T- 1.4718 The values of thermodynamic function at 30 ℃ are as follows. △H= -9. 2kJ mol-1 △S = 30.4J mol1 K-1