Measurements and Equation of State Modeling of the Density of Five 1‑Alcohols (C6–C10) at Pressures of up to 120 MPa

The density of five 1-alcohols (1-hexanol, 1-heptanol,
1-octanol,
1-nonanol, and 1-decanol) was measured using a vibrating-tube densimeter
at pressures of up to 120 MPa for temperatures between 298.15 and
423.15 K. The relative expanded uncertainty of the experimental data
is below 0.2%. The new results significantly extend the available
literature data. The density of the five alcohols was modeled using
four molecular-based equations of state (EOSs), namely PC-SAFT, SAFT-VR
Mie, soft SAFT, and CPA. New component-specific EOS models were parametrized
for all considered EOSs and substances using vapor–liquid equilibrium
data from the literature and the density data from this work. The
resulting EOS models describe the density with deviations of about
0.2–1.5%. For the thermal second-order derivative properties,
the relative deviations were 10–50% for the isothermal compressibility
and 5–35% for the thermal expansion coefficient. Also, the
extrapolation behavior of the EOS models was assessed. Overall, the
best results were obtained from the SAFT-VR Mie EOS.