Molar Heat Capacity at Constant Volume for Isobutane at Temperatures from (114 to 345) K and at Pressures to 35 MPa

Perkins, Robert L.; Magee, Joseph W.

doi:10.1021/je9001575

Cited by 11 publications

(13 citation statements)

References 19 publications

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“…With the speed-of-sound correlation and the results of the thermodynamic integration, further thermodynamic properties such as the thermal expansivity, the isentropic and isothermal compressibilities, and the isochoric heat capacity can be calculated. Since there is a comprehensive data set for the isochoric heat capacity of liquid isobutane published by Perkins and Magee, isochoric heat capacities were calculated by the thermodynamic relation in order to compare the results of the thermodynamic integration with these data. The derived values for the density, isobaric heat capacity, and isochoric heat capacity are reported in Table .…”

Section: Derived Propertiesmentioning

confidence: 99%

“…In this section, the derived properties are compared to the formulation of Bücker and Wagner and literature data. The distribution of the available literature data for the density of single-phase isobutane ,− and the domain of the thermodynamic integration in the fluid region are shown in Figure . The data of Glos et al, Perkins and Magee, Haynes, Kayukawa et al, and Miyamoto and Uematsu overlap with the domain of the thermodynamic integration and are compared with the derived densities.…”

Section: Comparison Of Derived Properties With Literature Datamentioning

confidence: 99%

“…The distribution of the available literature data for the density of single-phase isobutane ,− and the domain of the thermodynamic integration in the fluid region are shown in Figure . The data of Glos et al, Perkins and Magee, Haynes, Kayukawa et al, and Miyamoto and Uematsu overlap with the domain of the thermodynamic integration and are compared with the derived densities. The other data sets lie either in the gas region ,,,,, or in the liquid region outside the domain of the thermodynamic integration ,,,,− or their deviations from the formulation are so large that they lie in large part outside the scale of the figures. , …”

Section: Comparison Of Derived Properties With Literature Datamentioning

confidence: 99%

“…The gray shaded region denotes the region of thermodynamic integration. □ (in red), ref ; ×, ref ; × (in yellow), ref ; ◊ (in green), ref ; □ (in green), ref ; × (in green), ref ; + (in green), ref ; Δ (in green), ref ; + (in red), ref ; × (in red), ref ; ◊, ref ; □, ref ; ∇, ref ; Δ, ref ; +, ref ; + (in yellow), refs and ; □ (in blue), ref ; −, vapor pressure; and ---, critical temperature and pressure.…”

Section: Comparison Of Derived Properties With Literature Datamentioning

confidence: 99%

“…Fractional deviations Δρ = ρ(derv) – ρ(calc) of densities ρ(derv) derived by thermodynamic integration for isobutane and experimental data from the literature from values ρ(calc) calculated with the formulation of Bücker and Wagner as a function of pressure at temperatures between 200 and 260 K. Thermodynamic integration: −, derived densities; ---, uncertainty range of derived densities. Experimental data: □ (in red), ref ; ×, ref ; + (in red), ref ; ◊, ref ; ■ (in red), values interpolated with experimental data from ref ; and -·-, vapor pressure.…”

Section: Comparison Of Derived Properties With Literature Datamentioning

confidence: 99%

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Speed-of-Sound Measurements and Derived Thermodynamic Properties of Liquid Isobutane

Hawary

Meier

2018

J. Chem. Eng. Data

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This article reports comprehensive and accurate measurements of the speed of sound in liquid isobutane. The measurements were carried out by a double-path-length pulse-echo technique and cover the temperature range between 200 and 420 K with pressures of up to 100 MPa. The expanded measurement uncertainties (at the 0.95 confidence level) are 2.1 mK for temperature, 0.007% for pressure, and 0.009% for the speed of sound with the exception of a few state points at low pressures and in the vicinity of the critical point, where it increases up to 0.035%. Furthermore, densities and specific isobaric and isochoric heat capacities were derived from the speed-of-sound data in the temperature range between 200 and 340 K and up to 100 MPa by the method of thermodynamic integration. Very accurate results for the derived properties were obtained by determining values of the isobaric heat capacity on the initial isobar for the integration by a well-known thermodynamic relation among the isobaric heat capacity, density, and speed of sound from very accurate density data at low pressures of (Glos, S.; Kleinrahm, R.; Wagner, W. J. Chem. Thermodyn. 2004, 36, 1037−1059) and our speed-of-sound data. Moreover, these initial values were manually adjusted to enforce physically correct behavior of the calculated derivatives of the equation of state. Comparisons of the experimental speeds of sound and derived properties with the Helmholtz energy formulation of Bucker and Wagner for isobutane (Bucker, D.; Wagner, W. J. Phys. Chem. Ref. Data 2006Data , 35, 929−1019 and data from the literature demonstrate the high accuracy of the results and reveal potential to improve the formulation.

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Section: Derived Propertiesmentioning

confidence: 99%