Comparative study on Ce (III) and La (III) solvent extraction and separation from a nitric acid medium by D2EHPA and Cyanex272

2018 ◽  
Vol 115 (2) ◽  
pp. 207 ◽  
Author(s):  
R. Habibpour ◽  
M. Dargahi ◽  
E. Kashi ◽  
M. Bagherpour
Keyword(s):  
Nitric Acid ◽  
Solvent Extraction ◽  
Metal Ion ◽  
Chemical Speciation ◽  
Extraction Efficiency ◽  
Nitric Acid Medium ◽  
Extraction And Separation ◽  
Multi Stage ◽  
Three Stages ◽  
Ion Species

The solvent extraction of Cerium(III) and Lanthanum(III) from nitric acid solution using the organophosphorous extractants Di-(2-ethyl hexyl) phosphate (D2EHPA) and di-2,4,4- trimethylpentyl phosphoric acid (Cyanex272) in kerosene was investigated. In this study, the magnitude of the extraction of Ce(III) was found to be more significant with Cyanex272 than D2EHPA. D2EHPA was found to be a better extractant for La(III). Among the two extractants, Cyanex272 was used for the separation of Ce from La in three stages with an extraction efficiency of 90.2% for Ce. A 556 mg/L Ce solution was used for the scrubbing of La with an efficiency of ≈34%, which required multi stage scrubbing. The study of thermodynamic parameters such as enthalpy, entropy, and Gibbs free energy impart the exothermic and non-spontaneous process. The chemical speciation curves for lanthanum and cerium in the aqueous phase as a function of pH showed that the free La(III) and Ce(III) metal ion species were largely predominate between a pH = 0 and pH = 7.

Extraction of tetra- and hexavalent actinide ions from nitric acid solutions using some diglycolamide functionalized calix[4]arenes

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Rajesh B. Gujar ◽  
Parveen K. Verma ◽  
Prasanta K. Mohapatra ◽  
Mudassir Iqbal ◽  
Jurriaan Huskens ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Solvent Extraction ◽  
Extraction Efficiency ◽  
Minor Actinide ◽  
Acid Solutions ◽  
Extraction Mechanism ◽  
Nitrate Ion ◽  
Nitric Acid Solutions ◽  
Actinide Ions ◽  
Acid Extractant

Abstract Neptunium is one of the most important minor actinide elements with some of its isotopes having very long half-lives, therefore necessitating its separation from acidic radioactive wastes. Solvent extraction of Np4+ and NpO2 2+ was studied using three multiple diglycolamide (DGA) extractants with n-propyl, n-octyl and 3-pentyl substituents termed as L I , L II and L III , respectively, in a mixed diluent of 5% isodecanol and 95% n-dodecane. For comparison purpose, the extraction of Pu4+ and UO2 2+ was carried out under identical conditions. The extraction efficiency of the ligands for the tetravalent ions followed the trend: L II  > L I  > L III , which changed to L III  > L II  > L I for the hexavalent ions. While the extraction of the tetravalent ions was reasonably good (ca. 90–98%) with an extremely low (5.0 × 10−5 M) ligand concentration, poor extraction (ca. 5–16%) of the hexavalent ions was seen even with a 20 times higher concentration of the ligand. In general, Pu4+ was better extracted than Np4+, while NpO2 2+ was marginally better extracted then UO2 2+. A ‘solvation’ type extraction mechanism was proposed based on the extraction profiles obtained as a function of the concentrations of the feed nitric acid, extractant as well as nitrate ion. The extracted species were found out to be M(NO3)4·mL and MO2(NO3)2·nL (M = Np or Pu, 1 < m < 2, n ≃ 1).

Syntheses and evaluation of new hydrophilic azacryptands used as masking agents of technetium in solvent extraction processes

2021 ◽  
Vol 50 (5) ◽  
pp. 1620-1630
Author(s):  
Alexiane Thevenet ◽  
Ana Miljkovic ◽  
Sonia La Cognata ◽  
Cécile Marie ◽  
Christelle Tamain ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Solvent Extraction ◽  
Acid Medium ◽  
Separation Process ◽  
Nitric Acid Medium ◽  
Masking Agents ◽  
Extraction Processes

New azacryptands with the addition of hydrophilic groups were synthesized to bind selectively the pertechnetate anion in nitric acid medium, and avoid its extraction in the separation process.

scholarly journals Recovery of iron by jarosite crystallization and separation of vanadium by solvent extraction with extractant 7101 from titanium white waste liquid (TWWL)

2021 ◽  
Vol 83 (8) ◽  
pp. 2025-2037
Author(s):  
Wang Li ◽  
Zepeng Niu ◽  
Xiaobo Zhu
Keyword(s):  
Solvent Extraction ◽  
Extraction Efficiency ◽  
Ph Value ◽  
Influence Factors ◽  
Thermodynamic Theory ◽  
Vanadium Extraction ◽  
Ft Ir ◽  
Three Stages ◽  
Titanium White ◽  
Isothermal Curve

Abstract The jarosite crystallization and new extractant system for extractant 7101 was used to separate iron and extract vanadium from titanium white waste liquid (TWWL). The influence factors and mechanisms of crystallization and solvent extraction were investigated and analyzed using SEM-EDS, XRD, FT-IR, solution thermodynamic theory and extraction isothermal curve. More than 97% of iron was precipitated with the following conditions: potassium chlorate 15 g/L, pH value of 1.6, temperature of 95 °C and time of 90 min, in which the crystallization product was jarosite with a purity of 99.5%; the pH value of the solution decreased after precipitation. The extraction efficiency of vanadium reached 88.6% with 10% Fe, 5% Al(III) but less for Mg(II), K(I) and Na(I) under the conditions X7101 of 0.5, pH value of 2.0, time of 4 min and stirring speed of 40 r/min. The extraction of metal ions occurred in the order V(V) &gt; Fe(III) &gt; Al(III) &gt; Mg(II) &gt; K(I). Vanadium minimally existed as at pH 2.0, and the functional groups NH and C–N contributed to vanadium extraction using the extractant 7101. Four stages extraction and three stages of re-extraction were predicated by McCable–Thiele plots.

Solvent Extraction of Uranium with N,N-Di(2-Ethylhexyl)Octanamide from Nitric Acid Medium

2017 ◽  
Vol 35 (6) ◽  
pp. 439-449 ◽  
Author(s):  
Nao Tsutsui ◽  
Yasutoshi Ban ◽  
Hiroshi Sagawa ◽  
Sho Ishii ◽  
Tatsuro Matsumura
Keyword(s):  
Nitric Acid ◽  
Solvent Extraction ◽  
Acid Medium ◽  
Nitric Acid Medium

Comparision in the solvent extraction behavior of uranium (VI) in some trialkyl phosphates in ionic liquid

2016 ◽  
Vol 104 (12) ◽  
Author(s):  
R. Rama ◽  
Alok Rout ◽  
K. A. Venkatesan ◽  
M. P. Antony ◽  
A. Suresh
Keyword(s):  
Ionic Liquid ◽  
Nitric Acid ◽  
Solvent Extraction ◽  
Acid Medium ◽  
Fast Reactor ◽  
Nitric Acid Medium ◽  
Extraction Behavior ◽  
Trialkyl Phosphates

AbstractHigher homologs of trialkyl phosphates (TAlP) are proposed for reprocessing of fast reactor fuels. Solvent extraction behavior of U(VI) from nitric acid medium was studied in some TAlP present in 1-octyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([C

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