摘要
为了深入研究在盐酸介质中TBP萃取Cr(Ⅵ )的萃取行为 ,分别以煤油、四氯化碳、二甲苯为稀释剂 ,进行萃取平衡特性研究 ,考察了酸度、铬的初始浓度、有机相TBP含量以及温度对萃取平衡的影响。实验结果表明 :温度和稀释剂种类对萃取分配比的影响较小 ,酸度、TBP浓度和铬初始浓度对分配比影响较大。萃取过程所形成的萃合物为HCrO3 Cl·2TBP和HCrO3 Cl·3TBP。TBP在盐酸介质中萃取铬为吸热过程 ,其过程热为17.99kJ/mol。
This paper reports the extraction performance of chromium (Ⅵ) in hydrochloric acid by tributylpho-sphate (TBP) with various diluents such as kerosene, tetrachloride and dimethylbenzene. The effects of extraction temperatures, aqueous equilibrium acidity, original concentration of extractant and the original conc entration of Cr(Ⅵ) on equilibria of extraction were discussed. The results indicated that the distribution ratio was not influenced obviously by extraction temperature and diluents; but aqueous acidity, original concentration of extractant and original concentration of Cr(Ⅵ) affected greatly the distribution ratio; The thermodynamic function value ΔH of the process was measured as 17 99?kJ/mol.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2003年第12期1323-1326,共4页
Chemical Industry and Engineering Progress
