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Equation of state modeling of high-pressure, high-temperature hydrocarbon density data |
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| Authors: | Kun Liu Mark A McHugh Hseen Baled Robert M Enick Bryan D Morreale |
| Affiliation: | a Department of Chemical and Life Science Engineering, Virginia Commonwealth University, Richmond, VA 23284, USA b Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, PA, USA c National Energy Technology Laboratory, Office of Research and Development, Department of Energy, Pittsburgh, PA, USA |
| Abstract: | Experimental densities are reported for n-pentane, n-octane, cyclooctane, 2,2,4-trimethylpentane, n-decane, and toluene to ∼280 MPa and ∼250 °C. These densities are in good agreement with available literature data that typically cover lower pressure and temperature ranges than those reported here. The data are modeled with the Peng-Robinson (PR) and Soave-Redlich-Kwong (SRK) cubic equations, the temperature-dependent, volume-translated SRK equation, the temperature- and density-dependent SRK equation, and the SAFT and PC-SAFT equations. Mean absolute percentage deviation (MAPD) values between densities calculated with the PR equation and literature data are 4.55 for n-pentane, 2.91 for n-octane, 3.68 for cyclooctane, 3.98 for 2,2,4-trimethylpentane, 5.58 for n-decane, and 1.99 for toluene. With the exception of 2,2,4-trimethylpentane, these MAPD values are substantially better than those obtained with the SRK and modified SRK equations. Although both SAFT-based models have MAPD values significantly lower than those with the PR equation, the PC-SAFT equation provides the lowest MAPD values. |
| Keywords: | Hydrocarbon density Cubic equations SAFT PC-SAFT |
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