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Salting-out induced three-liquid-phase separation of Pt(IV), Pd(II) and Rh(III) in system of S201-acetonitrile-NaCl-water

机译:S201-乙腈-NaCl-水系统中的盐析诱导的Pt(IV),Pd(II)和Rh(III)的三相液相分离

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摘要

Salting-out induced three-liquid-phase system (TLPS) of diisopentyl sulfide (S201)-acetonitrile-NaCl-water was explored to extract and separate platinum, palladium and rhodium with one-step method. The influences of phase-forming behaviors of TLPS on partition of platinum-group metal (PGM) ions were investigated by changing the phase-forming salt and its concentration, HC1 concentration in equilibrating salt aqueous phases and the initial volume ratio of acetonitrile to aqueous NaCl solution. Experimental results indicated Pd(II), Pt(IV) and Rh(III) were selectively concentrated into the S201 organic top phase, acetoni-trile-rich middle phase and NaCl aqueous bottom phase respectively. The three-liquid-phase partition of platinum metal ions occurred with the salting-out induced two-phase splitting of acetonitrile-water mixtures. A micro-mechanism model is proposed to explain the influence of salting-out induced phase splitting behavior of three-liquid-phase system on mass transfer of PGM ions. Appearance of microscopic molecular aggregates accounts for the micro-phase enrichment of platinum metal ions. The competition of two opposite processes, salting-out induced dehydration of acetonitrile molecules in aqueous solutions while strong re-hydration of salting-out acetonitrile molecules in separated acetonitrile-rich phase, plays an important role in affecting the phase-forming behaviors and three-liquid-phase mass transfer of different platinum metal ions.
机译:研究了二异戊基硫醚(S201)-乙腈-NaCl-水盐析出的三相液相系统(TLPS),一步法萃取分离铂,钯和铑。通过改变相形成盐及其浓度,平衡盐水相中的HCl浓度以及乙腈与NaCl水溶液的初始体积比,研究了TLPS相形成行为对铂族金属(PGM)离子分配的影响。解。实验结果表明,分别将Pd(II),Pt(IV)和Rh(III)分别浓缩到S201有机上层相,富含乙腈的中间相和NaCl水溶液下层相。铂金属离子的三液相分配发生在盐析引起的乙腈-水混合物两相分离的过程中。提出了一种微力学模型来解释盐析引起的三相体系相分裂行为对PGM离子传质的影响。微观分子聚集体的出现解释了铂金属离子的微相富集。两种相反过程的竞争,即盐析引起的水溶液中乙腈分子的脱水,而盐析出的乙腈分子在分离的富含乙腈的相中的强再水化,在影响相形成行为中起着重要作用,并且三不同铂金属离子的液相传质。

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