Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Measurement of the Speed of Sound in Near-Critical and Supercritical n-Heptane at Temperatures from (513.40 to 650.90) K and Pressures from (2.5 to 10.0) MPa

Zhang, Ying, Chen, Yutian, Zhan, Taotao, He, Maogang
J. Chem. Eng. Data 2018, 63, 9, 3331-3337
ABSTRACT
The speed of sound in n-heptane was measured by the Brillouin light scattering (BLS) method. The examined region is T = (513.40 to 650.90) K along seven isobaric lines at p = (2.5, 3.0, 4.0, 5.0, 6.0, 8.0 and 10.0) MPa, which was near the critical point of n-heptane. The relative expanded uncertainty of BLS (k = 2) experimental system is estimated to be less than 1.3% for the speed of sound measurement. The variation tendencies of the speed of sound with increasing temperature and pressure were illustrated. Moreover, the calculated results from the multi-parameter equation of state (EOS) proposed by Span and Wagner were employed to assess the experimental data in this paper. The absolute average of the deviations (AAD) between the experimental data and the calculated results is 1.22% in the whole investigated p - T region.
Compounds
# Formula Name
1 C7H16 heptane
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
  • 124