Ultrasonic and 31P NMR investigations of an acidic nuclear extractant with some monosubstituted benzenes

Abstract

A B S T R A C TThe ultrasonic velocity, density and viscosity of an acidic nuclear extractant namely di (2-ethylhexyl) phosphoric acid (D2EHPA) and its binary mixtures with three monosubstituted benzenes, viz., nitrobenzene, chlorobenzene and toluene were determined at temperature T = 303.15 K and at pressure p = 0.1MPa. The experimental values were utilized to compute relaxation time, excess molar volume, excess Gibbs energy of activation of viscous flow, deviations in intermolecular free length, acoustic impedance, ultrasonic velocity and viscosity. The excess / deviation functions were fitted to fourth order Redlich-Kister type polynomial equation to estimate binary coefficients and standard errors between experimental and calculated data. The nature of these functions was utilized to speculate the nature of molecular interaction between component molecules of all studied binary mixtures. Furthermore, 31 P NMR spectra of pure D2EHPA and its binary mixtures with the monosubstituted benzenes were used to assess molecular interactions between components of liquid mixtures at microscopic level and to corroborate with the results obtained from bulk properties of liquid mixtures.

Acoustic assessment in binary mixtures of a polar nuclear extractant, DEHPA with eight non polar diluents at 303.15K – a comparative study

“…In continuation to our earlier works [12][13][14], the ultrasonic velocities, densities and viscosities of the binary liquid mixtures of DEHPA with eight non polar diluents (solvents) viz. n-pentane, nhexane, n-heptane, benzene, carbon tetrachloride, cyclohexane, carbon disulphide and dioxane were measured at 303.16K.…”

“…From the measured values of ultrasonic velocity (U), viscosity (ɳ) and density (), the acoustic impedance (Z), isentropic compressibility ( s ), intermolecular free length (L f ), free volume (V f ), internal pressure (π i ) and relaxation time  of a mixture are determined by using the following relations [12][13][14][15] as Z =…”

Extraction liquide-liquide de l’uranium et de quelques métaux restrictifs issus des jus uranifères de la République du Niger par l’acide di-2-éthylhexylphosphorique et l’oxyde de trioctylphosphine

“…Cette chute est due à la nature du milieu d'attaque. L'application de HDEHP sur les jus uranifères est favorable en milieu nitrique et illustrée à travers le procédé DAPEX (DiAlkylPhosphoric acid Extraction) (Dalai et al, 2016).…”

Viscosity modelling of tri-n-butyl phosphate + benzene mixtures at 308.15K

“…The probable error in mole fraction was estimated to be less than ± 2.10 -4 . The detailed procedure for measurements of density and viscosity of liquid mixtures are the same as described elsewhere [11,12] and the values reported in Table 2. The temperature was controlled at 308.15K within ± 0.1K using thermostatic bath in measurements of all sample properties.…”

“…Hence, it becomes of considerable interest to compute viscosity in liquid mixtures by applying various mathematical models and to identify the suitable relation for the studied liquid mixtures. As a continuation of our effort [11,12], dynamic viscosities of binary system: Tri-n-butyl phosphate (TBP) + benzene are estimated by using different mathematical relations of zero, one and two adjustable parameters [13][14][15][16][17][18][19][20][21] at 308.15K and then comparing the computed values of viscosities with that of the experimentally measured values. Our survey of the literature shows that there have not been any theoretical viscosity data reported for the binary system of TBP with benzene.…”