摘要
本文研究了三烷基胺(7301)从盐酸介质中萃取 Pd(Ⅱ)、Pt(Ⅳ)的热力学过程。通过考察7301浓度和温度对 Pd(Ⅱ),Pt(Ⅳ)分配比的影响,分别测出萃取反应的表观平衡常数 K,焓变△H、自由能变△G和熵变△S。
Studied here is thermodynamics in the extraction of HPdCl_4^- and PtCl_6^(2-) by trialkyl amine (7301) from hydrochloric acid medium.By investigating the influences of temperature and 7301 upon the distribution ratio D of Pd(Ⅱ) and Pt(Ⅳ),it is concluded that the relationship between log D_(Pd) or log D_(Pt) and log[7301]at 30℃,when the initial concentration of chloric ion is 0.6mol·l^(-1) and 0.3mol·l^(-1) respectively,is represented as logD_(Pd)=0.9884 log[7301]+3.1597 logD_(Pt)=1.9982 log[7301]+3.5281 and that between logD_(Pd) and 1/T,at 30℃ when the initial concentration of 7301 and chloric ion are respectively 2.0×10^(-3)mol.l^(-1) and 1.2mol.l^(-1),is shown as logD_(Pd)=-456.74/T+1.7983 and that between IogD_(Pt) and 1/T,at 30℃ when the initial concentration of 7301 and chloric ion are respectively are 0.01mol·l^(-1) and 0.3mol·l^(-1),is shown as logD_(Pt)=505.38/T-1.3057 The values of thermodynamic function at 30℃ are follows: K_(Pd)=8.67×10~2 K_(Pt)=3.04×10~2 ΔH_(Pd)=8.7kJ/mol ΔH_(Pt)=-9.66kJ/mol ΔG_(Pd)=-17.1kJ/mol ΔG_(Pt)=-14.4kJ/mol ΔS_(Pd)=85.05J/mol·K ΔS_(Pt)=15.65J/mol·K
出处
《化工冶金》
CSCD
北大核心
1990年第1期33-39,共7页
关键词
钯
铂
萃取
热力学
三烷基胺
Extraction thermodinamics
Palladium Platinum
Trialkyl amine
