Acidic organophosphorus extractants—I Extraction of lanthanides by means of dialkyl phosphoric acids—effect of structure and size of alkyl group

Kolařík, Z.; Pánková, H.

doi:10.1016/0022-1902(66)80123-9

Cited by 80 publications

(18 citation statements)

References 13 publications

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“…The same trend was observed previously in the extraction with neutral bidentate organophosphorus compounds (NBOPCs) [12]. In extraction of Ln(III) with dialkylphosphoric acids by the cation-exchange mechanism, the difference between the distribution factors in extraction from perchlorate and nitrate solutions is considerably smaller [13].…”

Section: Resultssupporting

confidence: 58%

Extraction Properties of Bis(diphenylphosphinylethyl)phosphinic Acid in Nitric Acid Solutions

2005

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Extraction of microamounts of U(VI), Th(IV), Sc(III), and Ln(III) from HNO 3 solutions with solutions of bis(diphenylphosphinylethyl)phosphinic acid in dichloroethane was studied. The stoichiometry of the extractable complexes was determined, and the effect of the inorganic anion and organic diluent on the extraction of rare-earth elements was examined. An increase in the number of phosphoryl groups in the extractant molecule and replacement of ethylene bridges between the phosphorus atoms by methylene bridges enhance the extraction of metal ions from nitric acid solutions.The interest in extraction properties of polyfunctional organophosphorus acids increased recently, because of the prospects for using these agents in radiochemical practice for the recovery of transplutonium, rare-earth (Ln), and other elements from nitric acid solutions [1]. It was shown that dibasic P, P`-di-(2-ethylhexyl)methylenediphosphonic acid [2, 3] and monobasic (diphenylphosphinylmethyl)phenylphosphinic [4] and bis(diphenylphosphinylmethyl)phosphinic (I) [5] acids exhibit extremely high extractive power toward Th(IV), U(VI), Am(III), and Ln(III) in nitric acid solutions. It was suggested that the high extractive power of acid I is due to the possibility of formation of six-membered chelate rings with metal ions, since the phosphoryl groups in this agent are linked with methylene bridges. In this connection, it is interesting to study how the length of the alkylene bridge between the P(O)OH and P(O) fragments and the number of phosphoryl groups in the extractant molecule affect its extractive power.To this end, we studied the extraction of U(VI), Th(IV), Sc(III), and Ln(III) from aqueous solutions of HNO 3 with solutions of bis(2-diphenylphosphinylethyl)phosphinic (II) and 2-phenylethyl-(2-diphenylphosphinylethyl)phosphinic (III) acids in dichloroethane. For comparison, we also studied the extraction with a neutral analog of II, pentaphenyldiethylenetriphosphine trioxide IV [6], and with diphenylphosphinic acid V.

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Section: Resultssupporting

confidence: 58%

Extraction Properties of Bis(diphenylphosphinylethyl)phosphinic Acid in Nitric Acid Solutions

2005

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“…data; the log DM = f(log [H j) dependency has been measured at CA,i = .1P and so an error and Sc(III) with (H)DE-HP at an unspecified room temperature (66G,67D,69M, 71C), 20°C (64G,76Ha), 22° to 23°C (57P,57Pa,58P,59P,64M,66Ka,69Ma,71K,72B,73Z,76M) …”

Section: Yttrium(iii) and Scandium(iii)mentioning

confidence: 99%

Critical evaluation of some equilibrium constants involving acidic organophosphorus extractants

Kolařík¹

1982

Pure and Applied Chemistry

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“…Rare earths (REs) have attracted considerable attention in the last few decades due to their wide application in advanced materials . Solvent extraction is generally accepted as a commercial technology for separating rare earths and a variety of extractants are being employed in REs hydrometallurgy, such as organic phosphoric acid, amine, carboxylic acid, etc . Among them, carboxylic acid has been considered to be a promising extractant due to its wide availability and relatively low cost.…”

Section: Introductionmentioning

confidence: 99%

Effective solvent extraction of La, Ce and Pr from hydrochloric acid with a novel extractant N,N-dihexyloxamic acid

Guo

Zhi

2016

J. Chem. Technol. Biotechnol

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BACKGROUND For the first time, N,N‐dihexyloxamic acid (HA) has been developed to extract La, Ce and Pr from hydrochloric acid solution in present work. RESULTS La, Ce and Pr can be extracted by HA in the pH range 1.3 to 2.0 using heptane as diluent. The extraction order was La < Ce < Pr. The separation factors were calculated to be 1.8 for La/Ce and for Ce/Pr. Based on slope analysis, all the rare earths (REs) were loaded in the form of REsCl0.6A2.4(HA)0.6 that may be a statistical expression of a mixture of complexes. Stripping tests showed that the loaded organic phase can be stripped by hydrochloric acid at medium acidity. CONCLUSION The extraction results obtained in the study suggest that N,N‐dihexyloxamic acid could serve as an effective extractant for La, Ce and Pr. © 2016 Society of Chemical Industry

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Acidic organophosphorus extractants—I Extraction of lanthanides by means of dialkyl phosphoric acids—effect of structure and size of alkyl group

Cited by 80 publications

References 13 publications

Extraction Properties of Bis(diphenylphosphinylethyl)phosphinic Acid in Nitric Acid Solutions

Extraction Properties of Bis(diphenylphosphinylethyl)phosphinic Acid in Nitric Acid Solutions

Critical evaluation of some equilibrium constants involving acidic organophosphorus extractants

Effective solvent extraction of La, Ce and Pr from hydrochloric acid with a novel extractant N,N-dihexyloxamic acid

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