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

Measurements of the Speed of Sound in Liquid and Supercritical n-Octane and Isooctane

Zhang, Ying, Chen, Yutian, Zheng, Yu, He, Xinxin, He, Maogang
J. Chem. Eng. Data 2018, 63, 1, 102-112
ABSTRACT
The speed of sound in n octane and isooctane (2, 2, 4 trimethylpentane) was measured by the Brillouin light scattering (BLS) method. The examined regions for n octane are T = (297 580) K along five isobaric lines at p = 0.1, 4.0, 7.0, 10.0 and 12.0 MPa for liquid and T = (573 673) K along ten isobaric lines with p = (3.0 10.0) MPa for supercritical fluid. The examined regions for isooctane are T = (294 525) K along five isobaric lines at p = 0.1, 3.0, 6.0, 10.0 and 12.0 MPa for liquid and T = (543 630) K along six isobaric lines with p = (3.0 10.0) MPa for supercritical fluid. The relative expanded uncertainty of the speed of sound is estimated less than 1.3 %. Polynomial representations for the speed of sound in liquid n octane and isooctane were fitted to the experimental results, respectively. The AADs are 0.27 % for n octane and 0.19 % for isooctane. The influence of temperature and pressure on the speed of sound was also analyzed. Moreover, the data were also used to assess the predicted ability of three equation of state for n octane.
Compounds
# Formula Name
1 C8H18 octane
2 C8H18 2,2,4-trimethylpentane
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 ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Brillouin light scattering
  • 137
  • 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
  • 120
  • POMD
  • 2
  • Speed of sound, m/s ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Brillouin light scattering
  • 104
  • POMD
  • 2
  • 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
  • 111