International Journal of Thermophysics

, Volume 26, Issue 6, pp 1733–1742 | Cite as

Isochoric Heat Capacities of Propane + Isobutane Mixtures at Temperatures from 280 to 420 K and at Pressures to 30 MPa



The isochoric heat capacity (c v ) and pressure–volume–temperature-composition (pvTx) properties were measured for propane + isobutane mixtures in the liquid phase and in the supercritical region. The expanded uncertainty (k = 2) of temperature measurements is estimated to be ±13 mK, and that of pressure measurements is ±8 kPa. The expanded relative uncertainty for c v is ±3.2% for the liquid phase, increasing to ±4.8% for near-critical densities. The expanded uncertainty for density is estimated to be ±0.16%. The present measurements for {xC3H8 +(1−x)i-C4H10} with x = 0.0, 0.498, 0.756, and 1.0, were obtained at 659 state points at temperatures from 270 to 420 K and at pressures up to 30 MPa. The experimental data were compared with a published equation of state.


critical region density heat capacity isobutane mixtures propane pvTx property 


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Copyright information

© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  • H. Kitajima
    • 1
  • N. Kagawa
    • 1
  • S. Tsuruno
    • 1
  • K. Watanabe
    • 2
  1. 1.Department of Mechanical Systems EngineeringNational Defense AcademyYokosukaJapan
  2. 2.Department of System Design Engineering, Faculty of Science and TechnologyKeio UniversityYokohamaJapan

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