Abstract:Isothermal vapor-liquid auilibrium dc m for propane-isobutane, a system of industrial importance, have been obtained in two pieces of apparatus at temperatures from 20" to 250°F.Over this temperature range, propane-isobutane form ideal solutions. The paper discusses the sampling errors which occur in volatile systems.
“…The systems n-butane-isobutane, propane-isobutane, and propane-n-butane are said to show small negative deviations from Raoult's law,26 and the system propane-isobutane has also been said to be fully ideal. 27 This agrees with the pattern of values found for the acetylamino acid derivatives. 24 A more direct model, although a more empirical one, would be based on the use of hydrophobic bonding energies Val-Leu, 25 °C 0.0 0.0 0.0 0 Reference 28.…”
Section: Discussionsupporting
confidence: 88%
“…M. Harding and R. Howieson, ibid., 32, 633 (1976). c K. Torii and Y. Iitaka, ibid., 27,2237 (1971). d V. Khawas, ibid., 26,1385 (1970).…”
“…The systems n-butane-isobutane, propane-isobutane, and propane-n-butane are said to show small negative deviations from Raoult's law,26 and the system propane-isobutane has also been said to be fully ideal. 27 This agrees with the pattern of values found for the acetylamino acid derivatives. 24 A more direct model, although a more empirical one, would be based on the use of hydrophobic bonding energies Val-Leu, 25 °C 0.0 0.0 0.0 0 Reference 28.…”
Section: Discussionsupporting
confidence: 88%
“…M. Harding and R. Howieson, ibid., 32, 633 (1976). c K. Torii and Y. Iitaka, ibid., 27,2237 (1971). d V. Khawas, ibid., 26,1385 (1970).…”
“… 10 Relative deviation of the vapor-pressure data for n -butane from the Miyamoto and Watanabe EoS: 2 ○, this work; ·, Flebbe et al; ▴, Kay; ▪, Kratzke; ◆, Machin and Golding; ×, Magee 11 Relative deviation of the vapor-pressure data for isobutane from the Miyamoto and Watanabe EoS: 3 ○, this work; ·, Beattie et al; ▴, Connolly; ▪, Gilliland and Scheeline; ◆, Higashi et al; ×, Hipkin; *, Hirata and Suda; +, Hondo et al. ; − , Kahre; · (in gray), KIST; − ▴ (in gray), Martinez-Ortiz and Manley; ▪ (in gray), Morris et al; ◆ (in gray), Sage and Lacey; × Steele et al; * (in gray), Wackher et al; + (in gray), Waxman et al; − (in gray), Weber. − …”
Hydrocarbons (HCs) are environmentally friendly natural refrigerants and are expected to be promising alternative candidates to replace some currently used halogenated hydrocarbon refrigerants. Some available data sets for HCs used to formulate the equations of state (EoS) for them are relatively old, so we point out that new data with less uncertainty are expected to play an essential role in updating the EoS for HCs. Therefore, a set of PVT property measurements for hydrocarbon refrigerants including propane, n-butane, and isobutane was conducted in the present study. A newly developed vibrating-tube densimeter was employed for the measurements, and then a total of 430 liquid PVT properties were obtained, including those at the saturation boundaries. The measurement range is (240 to 380) K for temperature and up to 7 MPa for pressure. The measurement uncertainty is about 3 mK for temperature, 0.26 kPa + 0.022% for pressure, and 0.1 kg‚m -3 + 0.024% for density. The present data were compared with available thermodynamic models that are currently considered to be the most reliable. A set of modified Tait equations of state for the liquid phase are also discussed.
“…In the case of the second form, vapor−liquid equilibrium data are very important basic information in evaluating the performance of refrigeration cycles and in determining the optimal composition of a mixture. For the mixture of propane (R-290) + isobutane (R-600a), vapor−liquid equilibrium (VLE) data at various temperatures were previously reported by some authors. − However, some of them were not in detail.…”
Section: Introductionmentioning
confidence: 99%
“…For the mixture of propane (R-290) + isobutane (R-600a), vaporliquid equilibrium (VLE) data at various temperatures were previously reported by some authors. [2][3][4][5][6] However, some of them were not in detail.…”
Isothermal vapor-liquid equilibria data for the binary mixture R-290 + R-600a at four equally spaced temperatures between (273.15 and 303.15) K were measured by using a circulation-type equilibrium apparatus. The experimental data were correlated with the Carnahan-Starling-De Santis equation of state (CSD-EOS) and the Peng-Robinson equation of state (PR-EOS) combined with the Wong-Sandler mixing rule. The data calculated by these equations of state are in good agreement with experimental data. Azeotropic behavior was not found in this mixture.
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