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Selective extraction of palladium(II) from hydrochloric acid solutions with pyridinecarboxamides and ACORGA~R CLX50

机译:用吡啶甲酰胺和ACORGA〜R CLX50从盐酸溶液中选择性萃取钯(II)

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摘要

The selectivity of Pd(II) extraction over Pt(IV),Pb(II),Cu(II) and Fe(III) with N-dodecylpyridine-3-carboxamide (3-C12) and N-dodecylpyridine-4-carboxamide (4-C12) is very high,compared with the commercial chelating extractant ACORGA~R CLX50;therefore,these pyridinecarboxamides can be considered as effective extractants for Pd(II) separation from hydrochloric acid solutions.Over 90% of palladium(II) can be effectively extracted with 3-C12 and 4-C12 in the presence of Pb(II),Cu(II) or Fe(III) over the studied HC1 concentration range.While merely up to 5% of the other metal is transported to the organic phase.Pd(II) can be separated from Pt(IV) efficiently at low HCl concentration.ACORGA ~RCLX50 indicates a much lower extraction than do pyridinecarboxamides in the same time range.The effect of the presence of NaCl is negligible.Extraction in a system with addition of NaCl is slightly lower than without the electrolyte.
机译:用N-十二烷基吡啶-3-甲酰胺(3-C12)和N-十二烷基吡啶-4-甲酰胺(Pt(IV),Pb(II),Cu(II)和Fe(III)萃取Pd(II)的选择性( 4-C12)与市售螯合萃取剂ACORGA〜R CLX50相比非常高;因此,这些吡啶甲酰胺可被视为从盐酸溶液中分离Pd(II)的有效萃取剂。在研究的HC1浓度范围内,在Pb(II),Cu(II)或Fe(III)存在下用3-C12和4-C12有效萃取。虽然只有5%的其他金属被运输到有机物中在较低的HCl浓度下,Pd(II)可以有效地与Pt(IV)分离.ACORGA〜RCLX50表示在相同时间范围内的萃取率比吡啶甲酰胺要低得多.NaCl的存在的影响可以忽略不计。添加氯化钠的体系比不添加电解质的体系略低。

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