Selective liquid-liquid extraction of palladium(II) from hydrochloric acid media by di-(2-ethylhexyl) thiophosphoric acid (DEHTPA)
Selective liquid-liquid extraction of palladium(II) from hydrochloric acid media by di-(2-ethylhexyl) thiophosphoric acid (DEHTPA)
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DOI：
10.1080/07366299908934616
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发表时间：
1999-03
影响因子：
2
通讯作者：
M. Rovira;J. Cortina;A. Sastre
中科院分区：
文献类型：
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作者：
M. Rovira;J. Cortina;A. Sastre
本文研究了用二（2-乙基己基）硫代磷酸（DEHTPA或HL）的煤油溶液从盐酸溶液中萃取钯（II）。用计算机程序LETAGROP-DISTR处理数据，研究了DEHTPA在水相和有机相之间的分配平衡。研究了平衡时间、有机相稀释剂、HCl和DEHTPA浓度以及温度对DEHTPA从HCl溶液中萃取Pd（II）的影响。实验平衡数据进行了数值分析，使用程序LETAGROP-DISTR和结果表明，Pd（II）萃取可以解释假设在有机相中形成的PdL 2配合物。发现DEHTPA对Pd（II）相对于Pt（IV）、Rh（HI）、Cu（II）、Fe（III）和Zn（II）具有选择性。还报道了使用不同的反萃取剂在有机相中负载的Pd（II）的反萃取。
ABSTRACT Liquid-liquid extraction of Pd(II) from hydrochloric acid solutions using di-(2-ethylhexyl) thiophosphoric acid (DEHTPA or HL) dissolved in kerosene has been studied. The distribution equilibrium of DEHTPA between the aqueous phase and the organic phase was investigated by treating the data with the computer program LETAGROP-DISTR. The extraction of Pd(II) from HC1 solutions by DEHTPA was studied as a function of several variables: equilibration time, organic phase diluent, HC1 and DEHTPA concentrations as well as temperature. Experimental equilibrium data were analyzed numerically using the program LETAGROP-DISTR and the results showed that Pd(II) extraction can be explained assuming the formation of PdL2 complexes in the organic phase. DEHTPA was found to be selective for Pd(II) against Pt(IV), Rh(HI), Cu(II), Fe(III) and Zn(II). The back-extraction of Pd(II) loaded in the organic phase using different stripping reagents is also reported.