Thermophysical Properties of 1-Hexene with Alcohols and Ether: Experimental and Modeling Insights

Abstract

The density (ρ), speed of sound (c), dynamic viscosity (η), kinematic viscosity (ν), and refractive index (n^D) were measured across the entire composition range for three binary mixtures: 2-butanol (1) + 1-hexene (2), 2-propanol (1) + 1-hexene (2), and isopropyl ether (1) + 1-hexene (2) at temperatures ranging from 298.15 to 313.15 K and a pressure of 0.1 MPa. Additionally, experimental data for the excess enthalpy (H^E) of these binary mixtures at T = 298.15 K and p = 0.1 MPa are presented in this work. The derivative properties are determined from the presented experimental data, and they are as follows: excess volume (V^E), deviation in speed of sound (Δc), isentropic compressibility (K_s), deviation in isentropic compressibility (ΔK_s), deviation in dynamic viscosity (Δη), and deviation in the refractive index (Δn^D). The ρ, c, η, ν, n^D, and K_s data are fitted by using a polynomial equation, while the Redlich–Kister equation is employed to correlate the V^E, ΔK_s, Δn^D, Δη, and H^E. Furthermore, the NRTL and UNIQUAC models are applied to correlate the H^E experimental data. The thermophysical behavior of each binary mixture is discussed in terms of molecular interactions between unlike molecules.