Density and speed of sound of (iodobenzene + n-alkane) liquid mixtures at T = (288.15 to 308.15) K. Application of the Prigogine-Flory-Patterson model

• DOI: 10.1016/j.fluid.2023.114017
• Publication Date: 2023-12-14T22:23:25Z
• Authors: Fernando Hevia; Daniel Lozano-Martín; Juan Antonio Gonz...; Luis Felipe Sanz; Isaías García de ...; José Carlos Cobos
• Keywords: Alkane; Iodobenzene; Speed of Sound

(Iodobenzene + n-alkane) liquid mixtures have been studied experimentally, in terms of densities and speeds sound at a pressure $p$ = 0.1 MPa the temperature range $T$ (288.15 to 308.15) K, theoretically, by application Prigogine-Flory-Patterson (PFP) model. The n-alkanes considered are n-heptane, n-decane, n-dodecane, n-tetradecane. Excess molar volumes ($V_{\text{m}}^{\text{E}}$) excess isentropic compressibilities ($\kappa_S^{\text{E}}$) calculated correlated Redlich-Kister polynomials. ${(\partial{V_{\text{m}}^{\text{E}}}/\partial T)}_p$ curves same (p,T) conditions obtained from $V_{\text{m}}^{\text{E}}$ values. From these experimental results knowledge enthalpies containing fluorobenzene, chlorobenzene or bromobenzene with n-alkanes, we inferred: (i) presence structural effects, especially important for n-heptane mixture less relevant volumetric properties as length n-alkane increases; (ii) that interactional effects on do not vary appreciably n-alkane, so observed variation is fundamentally determined corresponding contribution effects. PFP model supports this interpretation, providing free volume contributions parallelly rest approximately constant independently size.