Determination of viscosity and dielectric constant for studying the interactions in binary mixtures of organophosphorus acid and tertiary amine

Liu, Yang; Lee, Man Seung

doi:10.1016/j.molliq.2016.07.054

Cited by 9 publications

(4 citation statements)

References 33 publications

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“…Furthermore, the D2EHPA-amine mixtures exhibit higher viscosity values than the Cyanex 272-amine mixtures. This is in accordance with the previous studies [10,19] and with the fact that interactions between an amine and an acid extractant are proportional to the acidity of the acididic extractants (acidity of D2EHPA is greater than that of Cyanex 272 in view of pK a values [20]). Liu et al [10] estimated that the strength of the interactions between D2EHPA and Alamine 336 (mainly composed of tri-n-octylamine) is about three times as strong as Cyanex 272 and Alamine 336 by calculating excess values of dielectric constants.…”

Section: Physicochemical Propertiessupporting

confidence: 93%

Effect of the Addition of Amine in Organophosphorus Compounds on Molecular Structuration of Ionic Liquids–Application to Solvent Extraction

2020

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Variation of dynamic viscosity, density and enthalpy as a function of mole fraction of amine (tri-n-octylamine, triisooctylamine, bis(2-ethylhexyl)amine) in bis(2-ethylhexyl) phosphoric acid (D2EHPA) or Cyanex 272, (bis(2,4,4-trimethylpentyl)phosphinic acid) has been determined at 25 °C. Valuable information regarding structuration and destabilization of the corresponding ionic liquids has been deduced from these data. A simple model describing the variation of dynamic viscosity as a function of mole fraction of amine has been used to determine the speciation in these mixtures. Extraction tests of cobalt(II) and nickel(II) by D2EHPA-amine mixtures have shown the highest cobalt(II)-nickel(II) selectivity has been achieved with D2EHPA-2-ethylhexylamine mixture as cobalt(II) extraction efficiency of 77% was obtained, while no significant nickel(II) extraction was observed at a chloride concentration of 3 mol·L−1.

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Section: Physicochemical Propertiessupporting

confidence: 93%

Effect of the Addition of Amine in Organophosphorus Compounds on Molecular Structuration of Ionic Liquids–Application to Solvent Extraction

2020

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“…After extraction, equilibrium pH was measured and the value of pH eq was displayed in Table 2. In these experiments, the mole fraction of D2EHPA in the mixture was fixed at 0.6 on the basis of the reported literature [5,20]. The concentration of the mixtures and IL was kept at 0.5 M. The concentration of Co(II) was 500 mg•L −1 and the volume ratio of the two phases was unity.…”

Section: Effect Of Equilibrium Ph On Co(ii) Extractionmentioning

confidence: 99%

“…In another aspect, the structure of the amine and the acidic extractants can be changed in their mixtures when an interaction occurs and the formation of adducts has a certain effect on the metal extraction [1,21]. According to Liu et al, three kinds of interaction may occur between acidic and amine extractant such as (i) ion pair (R 3 NH + A − ), (ii) hydrogen bonding (R 3 NH-A), and (iii) binding which has an intermediate characteristic as represented by the location of the proton [5]. Similarly, the interactions such as dipole interaction, hydrogen bonding, and ion pair are proposed for mixed extractants of D2EHPA and Aliquat 336 on the basis of molecular chemistry [20].…”

Section: Effect Of Interactions Of the Components In Mixture On Co(ii) Extractionmentioning

confidence: 99%

“…It is important to select an appropriate extractant system for the target metal ions from diverse leaching solutions. In solvent extraction with mixtures of extractants, the efficiency and selectivity of the extractant mixtures greatly depend on some parameters such as the properties of the constituent extractants, the composition of the mixture, the nature of diluent, and the presence of salts in the aqueous solutions [1][2][3][4][5][6][7][8]. Among these factors, the interactions occurring in the mixtures have a significant effect on the extraction behavior of metal ions by the mixtures [8].…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Extraction Ability between a Mixture of Alamine 336/Aliquat 336 and D2EHPA and Ionic Liquid ALi-D2 from Weak Hydrochloric Acid Solution

Nguyen

Lee

2020

Metals

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The development of extraction systems to improve the extraction efficiency of metals using commercial extractants and ionic liquids is of importance. The extraction behavior of Co(II) between mixture of Alamine 336/Aliquat 336 and D2EHPA and synthesized ionic liquid ALi-D2 was compared in this work. Some factors, such as equilibrium pH, properties of the extractants, and concentration of components in the mixture had a remarkable effect on the extraction of Co(II). The interactions occurring in the mixtures as well as the change in solution pH were analyzed. Co(II) was completely extracted by ionic liquid when equilibrium pH was higher than 6.5, while it was difficult to extract Co(II) by employing the mixture of D2EHPA and Alamine 336/Aliquat 336. The formation of ionic liquid in the mixture of D2EHPA and Aliquat 336 was verified through FT-IR spectra. In addition, the competition extraction of hydrogen ion and Co(II) by ionic liquid ALi-D2 was explained. Among the three kinds of extractants, the ionic liquid showed the best extraction efficiency for Co(II) and pH control from weak acidic solutions. The present study provides valuable information on the extraction behavior of metal ion by the mixtures of commercial extractants, and thus can give some light on the development of metal extraction systems.

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Effect of n‐Hexane on the Dielectric and Refractive Properties of Octanoic Acid/tri‐n‐Butylphosphate: A Comparison

2022

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The diluent has influence on the intensity and nature of interaction among the constituents during solvent extraction. The physico‐chemical property of the phase where diluent is present required examination for optimizing the extraction conditions. The assessment of extraction efficiency is done on the basis of interaction between extractant and diluent. Densities, dielectric constants, and refractive indices have been measured for the binary mixture of octanoic acid/tri‐n‐butyl phosphate (TBP) with n‐hexane at T=303, 308 and 313 K over the whole constitution range. The dielectric constant, molar polarisation, refractive index and molar refraction values are maximum at 0.7674 mole fraction of octanoic acid and at 0.6577 of tri‐n‐butyl phosphate in binary mixture with n‐hexane. The values were used to further find out the molar polarization, molar refraction, correlation factor and excess Gibbs free energy. The excess values of the different properties were evaluated and fitted to the Redlich‐Kister polynomial equation. Negative values of ϵE were observed for octanoic acid and n‐hexane binary mixture at 308 and 313 K suggesting the dipoles were not aligned. For tri‐n‐butyl phosphate and n‐hexane binary mixture, positive ϵE values indicated the reduced number of aligned dipoles. The correlated motion of dipoles was explained by calculating the g values using Kirkwood‐Frohlich equation with the aid of dielectric and refractive index values of the pure solutes.

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Determination of viscosity and dielectric constant for studying the interactions in binary mixtures of organophosphorus acid and tertiary amine

Cited by 9 publications

References 33 publications

Effect of the Addition of Amine in Organophosphorus Compounds on Molecular Structuration of Ionic Liquids–Application to Solvent Extraction

Effect of the Addition of Amine in Organophosphorus Compounds on Molecular Structuration of Ionic Liquids–Application to Solvent Extraction

Comparison of Extraction Ability between a Mixture of Alamine 336/Aliquat 336 and D2EHPA and Ionic Liquid ALi-D2 from Weak Hydrochloric Acid Solution

Effect of n‐Hexane on the Dielectric and Refractive Properties of Octanoic Acid/tri‐n‐Butylphosphate: A Comparison

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