Paraffin Wax - Topo, an Extract Ant for Actinides and Lanthanides

Mathur, J. N.; Choppin, Gregory R.

doi:10.1080/07366299808934550

Cited by 19 publications

(5 citation statements)

References 8 publications

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“…Up to now, there are many acidic organophosphorous extractants, − neutral organophosphorous extractants, − and amine extractants, which are used for RE separation in hydrochloric acid, nitrate acid, or sulfuric acid systems. The extraction property and separation sequence was influenced by the extractant and different medium.…”

Section: Introductionmentioning

confidence: 99%

Highly Selective Extraction and Separation of Rare Earths(III) Using Bifunctional Ionic Liquid Extractant

Guo

Chen

Shen

et al. 2014

ACS Sustainable Chem. Eng.

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The extraction and separation of rare earths (REs) from nitrate medium or chloride medium using bifunctional ionic liquid extractants (Bif-ILEs) [trialkylmethylammonium][di(2-ethylhexyl)orthophosphinate] ([A336][P507]) and [trialkylmethylammonium][di-2-ethylhexylphosphate] ([A336][P204]) in n-heptane were investigated in this report. The separation factor (β) values indicated that [A336][P507] and [A336][P204] could be suitable for the separation of heavy REs(III) in nitrate medium and suitable for the separation of light REs(III) in chloride medium. Especially, in nitrate medium, the β values using [A336][P204] as the extractant were Tm/Er (3.36), Yb/Tm (7.92), and Lu/Yb (8.55), respectively, and in chloride medium, the β values using [A336][P507] as the extractant were Nd/Pr (9.52) and Sm/Nd (4.70), respectively. The β̅ z+1/z values of REs(III) extracted by [A336][P507] and [A336][P204] in nitrate medium were 3.61 and 3.67, respectively, and in chloride medium, they were 2.75 and 2.59, respectively.

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Section: Introductionmentioning

confidence: 99%

Highly Selective Extraction and Separation of Rare Earths(III) Using Bifunctional Ionic Liquid Extractant

Guo

Chen

Shen

et al. 2014

ACS Sustainable Chem. Eng.

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“…Neutral organophosphates have long been applied to extract and separate rare earth ions in the industry. , The salting-out agent was used to improve the extraction performance of rare earth ions in these extraction systems. , Despite the wide application of these extractants in the extraction of rare earth ions, the mechanism of extraction and specific salt effect in these systems were still not clear, particularly at a molecular level.…”

Section: Introductionmentioning

confidence: 99%

Specific Salt Effect on the Interaction between Rare Earth Ions and Trioctylphosphine Oxide Molecules at the Organic–Aqueous Two-Phase Interface: Experiments and Molecular Dynamics Simulations

2018

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Understanding the essence of the specific salt effect on the enhancement of the transport of metal ions across the liquid/liquid interface during the process of solvent extraction is of crucial importance for the development of a new approach to extract and selectively separate various valuable metals from complex aqueous solutions. However, some abnormal experimental phenomena involved in the salt effect on the liquid/liquid solvent extraction could not be understood only from the conventional interpretation based on the salting-out ability of salt ions. The knowledge into the microscopic mechanism behind the specific salt effect was urgent. Herein, as an example, the effect of adding various salts on the extraction performance of rare earth ion Pr using trioctylphosphine oxide (TOPO) as the organic extractant was investigated. It was revealed that the difference in the interface propensity of different salt anions enriched at the organic-aqueous two-phase interface played a crucial role in promoting the interaction of TOPO molecules with Pr ions, despite the occurrence of the salting-out effect of those salt anions with the increase of their concentrations in aqueous solutions. The interfacial interaction mechanism obtained by molecular dynamics simulations revealed that both the interface propensity and the salting-out ability of the coexisting salt anions contributed to the enhancement in the extraction of Pr into the TOPO organic phase. However, when the concentrations of coexisting salts in aqueous solutions were low enough, the extraction of Pr was mainly dominated by the interface propensity of those added salt anions but not their salting-out ability. With the increase in the concentration of salts, the salting-out effect gradually became significant and, therefore, began to join with the interface propensity of salt anions to co-dominate the transport of Pr ions across the liquid/liquid interface. The present study highlights the microscopic nature of the salt effect on promoting the extraction of rare earth ions and suggests that the interaction of organic extractant molecules with rare earth ions at liquid/liquid interface was dependent not only upon the salting-out ability of the coexisting salt ions but also their interface propensity.

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“…Lipophilic analogues have long been studied as solvent extraction agents for rare earths, lanthanides, and actinides − and for protic organic species such as alcohols and carboxylic acids. , A well-known example, trioctylphosphine oxide (TOPO), has been used commercially in the recovery of uranium from wet process phosphoric acid and recovery of byproduct acetic acid and furfural generated during sulfite wood pulping . Development of novel metal chelating agents containing the phosphine oxide functional group remains an active area of research. − In addition to their utility as metal ion complexants, organophosphine oxides have application as Lewis base catalysts, − antitumor agents, and electron transport materials in light-emitting diodes. − …”

Section: Introductionmentioning

confidence: 99%

Conformations of Organophosphine Oxides

et al. 2015

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The conformations of a series of organophosphine oxides, OP(CH3)2R, where R = methyl, ethyl, isopropyl, tert-butyl, vinyl, and phenyl, are predicted using the MP2/cc-pVTZ level of theory. Comparison of potential energy surfaces for rotation about P-C bonds with crystal structure data reveals a strong correlation between predicted location and energetics of minima and histograms of dihedral angle distributions observed in the solid state. In addition, the most stable conformers are those that minimize the extent of steric repulsion between adjacent rotor substituents, and the torsional barriers tend to increase with the steric bulk of the rotating alkyl group. MM3 force field parameters were adjusted to fit the MP2 results, providing a fast and accurate model for predicting organophosphine oxides shapes-an essential part of understanding the chemistry of these compounds. The predictive power of the modified MM3 model was tested against MP2/ cc-pVTZ conformations for triethylphosphine oxide, OP(CH2CH3)3, and triphenylphosphine oxide, OP(Ph)3. Disciplines Chemistry CommentsReprinted (adapted) ABSTRACT: The conformations of a series of organophosphine oxides, OP(CH 3 ) 2 R, where R = methyl, ethyl, isopropyl, tert-butyl, vinyl, and phenyl, are predicted using the MP2/cc-pVTZ level of theory. Comparison of potential energy surfaces for rotation about P−C bonds with crystal structure data reveals a strong correlation between predicted location and energetics of minima and histograms of dihedral angle distributions observed in the solid state. In addition, the most stable conformers are those that minimize the extent of steric repulsion between adjacent rotor substituents, and the torsional barriers tend to increase with the steric bulk of the rotating alkyl group. MM3 force field parameters were adjusted to fit the MP2 results, providing a fast and accurate model for predicting organophosphine oxides shapesan essential part of understanding the chemistry of these compounds. The predictive power of the modified MM3 model was tested against MP2/cc-pVTZ conformations for triethylphosphine oxide, OP(CH 2 CH 3 ) 3 , and triphenylphosphine oxide, OP(Ph) 3 .

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Paraffin Wax - Topo, an Extract Ant for Actinides and Lanthanides

Cited by 19 publications

References 8 publications

Highly Selective Extraction and Separation of Rare Earths(III) Using Bifunctional Ionic Liquid Extractant

Highly Selective Extraction and Separation of Rare Earths(III) Using Bifunctional Ionic Liquid Extractant

Specific Salt Effect on the Interaction between Rare Earth Ions and Trioctylphosphine Oxide Molecules at the Organic–Aqueous Two-Phase Interface: Experiments and Molecular Dynamics Simulations

Conformations of Organophosphine Oxides

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