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

Authors: Kitajima, H.; Kagawa, N.; Tsuruno, S.; Watanabe, K.

Source: International Journal of Thermophysics, Volume 26, Number 6, November 2005 , pp. 1733-1742(10)

Publisher: Springer

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Abstract:

The isochoric heat capacity (cv) 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 cv 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.

Keywords: critical region; density; heat capacity; isobutane; mixtures; propane; pvTx property

Document Type: Research Article

DOI: http://dx.doi.org/10.1007/s10765-005-8592-5

Affiliations: Email: kagawa@nda.ac.jp

Publication date: November 1, 2005

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