Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Measurement of the speed of sound in supercritical n-hexane at temperatures from (509.17-637.99) K and pressures from (3.5-7.5) MPa

Zhan, Taotao, Zhang, Ying, Chen, Junshuai, Liu, Xiangyang, He, Maogang
Fluid Phase Equilib. 2019, 497, 97-103
ABSTRACT
n-Hexane is a significant component of industrial fluids. The speed of sound in supercritical n-hexane was measured by Brillouin light scattering (BLS) technique in the temperature range from (509.17-637.99) K along five isobars at p = (3.5, 4.5, 5.5, 6.5 and 7.5) MPa. The relative expanded measurement uncertainty in the speed of sound at the 95% confidence level is estimated to be 0.018. For the studied supercritical n-hexane, the change regularities of the speed of sound with increasing temperature and pressure are illustrated. Moreover, the well-known equation of state (EOS) proposed by Span and Wagner is assessed, and the absolute average deviation (AAD) between the experimental results and the calculated values is 0.89% for the whole examined p - T region.
Compounds
# Formula Name
1 C6H14 hexane
Datasets
The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type Compound-# Property Variable Constraint Phase Method #Points
  • POMD
  • 1
  • Speed of sound, m/s ; Fluid (supercritical or subcritical phases)
  • Temperature, K; Fluid (supercritical or subcritical phases)
  • Pressure, kPa; Fluid (supercritical or subcritical phases)
  • Fluid (supercritical or subcritical phases)
  • Brillouin light scattering technique
  • 145