Liquid viscosity, interfacial tension, thermal and mutual diffusivities of mixtures of n-eicosane with dissolved carbon dioxide

The thermophysical properties of systems with alkanes with dissolved carbon dioxide (CO₂) are of importance in the aspects of carbon capture and storage (CCS), enhanced oil recovery (EOR), Fischer-Tropsch (FT) synthesis, et al. This work continues for our previous studies about the thermophysical properties of several binary systems with alkane and CO₂. In this work, the liquid viscosity, interfacial tension, thermal and mutual diffusivity of normal eicosane n-C₂₀H₄₂ with dissolved CO₂ were measured with dynamic light scattering (DLS) method from (323 to 473) K and (0.1 to 5.6) MPa. The system's liquid viscosity and interfacial tension were analyzed as a function of pressure under each isotherm line. The polynomial-based empirical correlations were developed for liquid viscosity and interfacial tension with pressure and temperature. The maximum deviations were 4.4 % for liquid viscosity and 1.1 mN·m⁻¹ for interfacial tension. The experimental interfacial tension from the literature was compared with this work, and the deviations were mostly with 0.50 mN·m⁻¹. The mutual diffusivity of the system was nearly a constant along the investigated composition range in this work. The mass diffusion coefficients from the literature agree with this work. The results from this work were expected to provide reliable and accurate fundamental thermophysical properties of liquid with dissolved gas systems in engineering and chemical processes.