Correlations among Composition, Temperature, and Density, Viscosity, or Derived Thermodynamic Properties of Binary Mixtures of Tri-n-butyl Phosphate withn-Hexane orn-Dodecane

Abstract

Correlations proposed in this work predict density and viscosity with better accuracy in comparison with existing correlations. Dimensionless specific volume and logarithmic viscosity of binary mixtures are nth order (1 ≤ n ≤ 4) polynomials of the mole fraction of one of the components at the system temperature, and parametric coefficients of such polynomials are mth order (1 ≤ m ≤ 4) polynomials of system temperatures. Parametric coefficients of fitted fourth order Redlich−Kister type equations (RK-eq) are linear functions of temperature. Excess properties and derived thermodynamic properties of both mixtures have been discussed in terms of intramolecular and intermolecular interactions of molecules. Like virial equations of state (EOS), dimensionless RK-eq quantifies to calculate virial coefficients and hence to compute interactions among component 1−1, component 1−2, and component 2−2. Parametric coefficients of the Vogel−Fulcher−Tammann equation of viscosity are polynomials of mole fractions of one of the components.

Density, Refractive Index, and Sound Velocity for the Binary Mixtures of Tri-n-Butyl Phosphate and n-Butanol between 303.15 K and 323.15 K

“…In general, the first factor comprises of specific forces between molecules, such as dipole–dipole, dipole–induced dipole, hydrogen-bonding, charge-transfer, etc. Usually, breaking up of hydrogen bonds gives rise to positive excess molar volumes and vice versa. , As TBP is a mild self-associated liquid remaining in either a wood-pile or head–tail arrangement, , its admixture with n -BuOH would mutually induce dissociation of their hydrogen-bonded structures, and subsequently, formation of new PO···HO type H-bonds between the oxygen atom of the >PO group of TBP and the hydrogen of the −OH group of n -BuOH. The experimental positive V m E thus obviously leads to suggest that, within mixtures the interaction leading to a new H-bond between TBP and n -BuOH is rather weaker than the total interactions of TBP–TBP and n -BuOH– n -BuOH.…”

“…Hence, thermodynamic studies on the interaction of TBP with polar and nonpolar cosolvents are significant in understanding the mechanism of the extraction process. Because of its importance, many investigators have already devoted themselves to the study of various TBP-dilution systems. − The study of organic systems having phosphates and polar groups also serves as the model for hydrogen-bonded systems in understanding biological processes . With this aim, we have chosen n -butanol ( n -BuOH) as a cosolvent.…”

Density, Viscosity, and Interfacial Tension of Binary Mixture of Tri-iso-amyl Phosphate (TiAP) and n-Dodecane: Effect of Compositions and Gamma Absorbed Doses

“…The percentage compositions of organic reagents were determined by standardized gas chromatographic method using a Shimadzu model gas chromatograph (2010) equipped with a FID detector. The purities of organic chemicals were greater than 0.991 mol fraction and are reported in Table , which were further checked by measuring and comparing the densities, ,,,− viscosities, ,− and interfacial tensions ,, with their literature values. All molar quantities were based on the IUPAC relative atomic mass table.…”

“…Reprocessing of spent nuclear fuel is based on the PUREX process employing 0.26 mol fraction of tri- n- butyl phosphate (TBP) , in n- paraffin, for selective separation of uranium and plutonium from fission products. Choice of this extraction system is based on its inherent advantages, viz.…”

“…Reports on comparative investigation of physicochemical properties of TiAP with other organophosphorous extractants have been scant in the literature. ,,, Density at temperatures from (298 to 338) K and viscosity at temperatures from (301 to 338) K have been reported for pure TiAP . Density of pure TiAP has also been reported at temperatures from (283.15 to 363.15) K, which differ significantly .…”