Simultaneous compressed liquid viscosity and density measurements of n-alkanes at temperatures between (291 and 353) K and pressures up to 50 MPa

• Published in: The Journal of chemical thermodynamics 2022-09, Vol.172, p.106830, Article 106830
• Main Authors: Mendo-Sánchez, Rubén P., Ruiz-Llamas, Aimee, Pimentel-Rodas, Alfredo, Galicia-Luna, Luis A.
• Format: Article
• Language: English
• Subjects: Alkanes; Density; High pressures; Viscosity
• ISSN: 0021-9614; 1096-3626
• DOI: 10.1016/j.jct.2022.106830

•Simultaneous compressed liquid viscosity and density measurements of n-alkanes.•High pressure measurements of viscosity and density of hexane, heptane, octane, nonane, and decane.•Viscosity and density behaviors at high pressures of n-alkanes. Compressed liquid density (ρ) and dynamic viscosity (η) were simultaneously measured for pure liquid n-alkanes (n-hexane, n-heptane, n-octane, n-nonane, and n-decane) in the temperature range from (291 to 353) K and pressure up to 50 MPa by an experimental system using a coil capillary tube viscometer (CCTV) coupled with a vibrating tube densimeter (VTD). The reliability and validation of this measuring system were verified by determining and comparing both dynamic viscosity and density data of ethanol published in the international literature. The maximum viscosity deviation was 8 μPa ∙ s for viscosity and 0.87 kg ∙ m−3 for density. The measurements were carried out with a relative expanded uncertainty (k=2) of 1.00 % for the measurements of dynamic viscosity and 0.20 % for the measurements of density considering the impurities of the chemical compounds). Both dynamic viscosity and density data were represented using two empirical models, obtaining a maximum deviation of 2.49 % for the dynamic viscosity and 0.12 % for the density with the experimental data. Finally, the isothermal compressibility and isobaric thermal expansivity were calculated from the empirical models at the reported conditions.