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Selective extraction of palladium(II) from hydrochloric acid solutions with phosphonium extractants

机译:用phospho萃取剂选择性地从盐酸溶液中萃取钯(II)

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The selectivity of palladium(II) extraction over nickel(II), copper(II), lead(II), iron(III), rhodium(III), ruthenium(III) and platinum(IV) with quaternary phosphonium salts: trihexyl(tetradecyl)phosphonium chloride (Cyphos~RIL 101) and trihexyl-(tetradecyl)phosphonium bis-2,4,4-trimethylpentylphosphinate (Cyphos~RIL 104), in the presence of toluene, has been investigated. Over 99% of palladium(II) can be effectively extracted with Cyphos~RIL 101 and Cyphos~RIL 104 from 0.1 M HC1 in the presence of nickel(II), copper(II), lead(II), iron(III), rhodium(III) and ruthenium(III), while less than 10% of the other metals is transported to the organic phase. Separation of palladium(II) from platinum(IV) is not so effective; about 70-75% palladium(II) and 60-68% platinum(IV) is extracted. The selectivity of palladium(II) extraction over lead(II), iron(III) and platinum(IV) depends upon the acidity of aqueous solution and with increasing HC1 concentration, the selectivity decreases. Palladium(II) can be separated from platinum(IV) successfully through stripping of palladium(II) from the loaded organic phase with 0.5 M ammonia solution.
机译:季phospho盐对镍(II),铜(II),铅(II),铁(III),铑(III),钌(III)和铂(IV)的萃取钯(II)的选择性:三己基(在甲苯存在下,研究了十四烷基)氯化phosph(Cyphos-RIL 101)和三己基-(十四烷基)phosph双-2,4,4-三甲基戊基次膦酸酯(Cyphos-RIL 104)。在镍(II),铜(II),铅(II),铁(III),铑(III)和钌(III),而不到10%的其他金属被运输到有机相。将钯(II)与铂(IV)分离不是很有效。提取约70-75%的钯(II)和60-68%的铂(IV)。钯(II)萃取对铅(II),铁(III)和铂(IV)的选择性取决于水溶液的酸度,并且随着HCl浓度的增加,选择性降低。通过用0.5 M氨溶液从负载的有机相中汽提钯(II),可以成功地将钯(II)与铂(IV)分离。

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