Palladium Extraction from Nitrate Solutions with the Disulfide of Bis(2,4,4‐trimethylpentyl)dithiophosphinic Acid,ChemistrySelect

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Palladium Extraction from Nitrate Solutions with the Disulfide of Bis(2,4,4‐trimethylpentyl)dithiophosphinic Acid
ChemistrySelect ( IF 1.9 ) Pub Date : 2020-12-01 , DOI: 10.1002/slct.202003660
Natalya A. Grigorieva ₁ , Isaac Y. Fleitlikh ₁ , Olga A. Logutenko ₂

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This work presents data on palladium recovery from nitrate solutions with the disulfide of bis(2,4,4‐trimethylpentyl)dithiophosphinic acid (L) in toluene. Extraction of palladium with the disulfide is slow but it increases as the concentration of L in the organic phase increases. At a concentration of L equal to 0.01 mol/L, almost complete extraction of palladium (99.7 %) is achieved within 20 minutes. The extraction efficiency also increases with increasing temperature. Maximum palladium recovery occurs at an HNO₃ concentration of 1.0 mol/L in the aqueous phase. Analysis of the interphase palladium distribution showed that the extraction of palladium with the disulfide in toluene is due to the formation of the complexes of variable composition [(Pd(NO₃)₂)_n⋅L] in the organic phase where n=1–4. The disulfide can be used to recover palladium from nitric acid solutions containing metal impurities. The degree of palladium extraction in one‐stage is 98.2 %, therefore the extractant is highly selective toward Pd(II) in the presence of Ni(II), Cu(II), Co(II), Zn(II), and Fe(III). Almost complete palladium stripping from the organic phase is achieved with a mixture of thiourea and hydrochloric acid solutions.

中文翻译：

双（2,4,4-三甲基戊基）二硫代次膦酸二硫化物从硝酸盐溶液中萃取钯

这项工作提供了有关双（2,4,4-三甲基戊基）二硫代次膦酸（L）在甲苯中的二硫化物从硝酸盐溶液中回收钯的数据。用二硫化物萃取钯的速度很慢，但随着有机相中L浓度的增加而增加。当L的浓度等于0.01 mol / L时，在20分钟内几乎可以完全提取钯（99.7％）。提取效率也随着温度的升高而增加。在水相中HNO ₃浓度为1.0 mol / L时，钯回收率最高。对相间钯分布的分析表明，在甲苯中用二硫化物萃取钯是由于形成了组成可变的[（Pd（NO ₃）₂）]_{n ＝} L]在有机相中，其中n = 1–4。二硫化物可用于从含有金属杂质的硝酸溶液中回收钯。钯的一级萃取率为98.2％，因此在Ni（II），Cu（II），Co（II），Zn（II）和Fe的存在下，萃取剂对Pd（II）具有高度选择性（III）。用硫脲和盐酸溶液的混合物几乎可以从有机相中完全除去钯。

更新日期：2020-12-01

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