Volumetric, Dielectric and Refractive Properties of Tri-n-octylamine and n-Hexane Binary Mixtures at Different Temperatures

The present investigation reports the interaction between tri-n-octyl amine (TOA) and n-hexane in the temperature range 298.15 to 313.15 K with 5 K interval. The experimental values of density (rho), molar volume (V-m), partial molar volume (\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${{\bar {V}}_{i}}$$\end{document}), apparent molar volume (V-phi), dielectric constant (e), refractive index (n(D)), molar polarization (P-m), and molar refraction (R-m) at various temperatures are presented. Dielectric constant and refractive index have been estimated using mixing rules. Excess values of (\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$V_{{\text{m}}}<^>{{\text{E}}}$$\end{document}, \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\varepsilon _{{\text{m}}}<^>{{\text{E}}}$$\end{document}, & UDelta;n(Dm), \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$P_{{\text{m}}}<^>{{\text{E}}}$$\end{document}, and \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\Delta R_{{\text{m}}}<^>{{\text{E}}}$$\end{document}) are determined to get information regarding the interaction between two components. Redlich-Kister polynomial equation has been used to for the fitting of excess values. This observation is well supported by positive deviation of the refractive index at the reported temperatures. The g values more than unity prove that less interaction in mixture leading to probability of its efficient contribution towards metal solvent extraction. The FTIR studies also complements the observations obtained from the scrutiny of different physicochemical properties.

Automated summary

In this study, the interaction between tri-n-octyl amine (TOA) and n-hexane was investigated by examining their physical and chemical properties at various temperatures. The results indicate that there is a limited interaction between these two components in the mixture, leading to a potentially efficient contribution towards metal solvent extraction.