Density measurements on binary mixtures (nitrogen + carbon dioxide and argon + carbon dioxide) at temperatures from (298.15 to 423.15) K with pressures from (11 to 31) MPa using a single-sinker densimeter |
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| Institution: | 1. State Key Laboratory of Power Systems, Department of Thermal Engineering, Tsinghua University, Beijing 100084, PR China;2. Lehrstuhl für Thermodynamik, Ruhr-Universität Bochum, D-44780 Bochum, Germany;1. MINES ParisTech, PSL Research University, CTP-Centre Thermodynamic of Processes 35, Rue Saint Honoré, 77305 Fontainebleau, France;2. Air Liquide Centre de Recherche Claude Delorme 1, chemin de la porte des Loges BP 126, 78354 Loges en Josas, France;1. Department of Chemical Engineering, Qatar University, Doha, Qatar;2. Department of Chemistry, University of Burgos, Burgos, Spain;3. Chemical Engineering Department, Texas A&M University, College Stations, TX, USA;4. Gas Processing Center, Qatar University, Doha, Qatar;1. Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK;2. Applied Chemical and Materials Division, National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80305-3337, USA;1. Grupo de Termodinámica y Calibración (TERMOCAL), Dpto. Ingeniería Energética y Fluidomecánica, Escuela de Ingenierías Industriales. Universidad de Valladolid, Paseo del Cauce, 59, E-47011 Valladolid, Spain;2. Centro Español de Metrología (CEM), C/ Alfar, 2, E-28760 Tres Cantos, Madrid, Spain;3. SMÚ Slovak Institute of Metrology, Karloveská 63, SK-842 55 Bratislava, Slovakia |
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| Abstract: | A single-sinker densimeter was built to specifically investigate the (p, ρ, T, x) behavior of fluid mixtures relevant for carbon capture and storage (CCS). Due to the use of a magnetic-suspension coupling, the densimeter enables measurements over the temperature range from (273.15 to 423.15) K with pressures up to 35 MPa. A comprehensive analysis of the experimental uncertainties was undertaken. The expanded uncertainties (k = 2) are 35 mK for temperature, 3.39 kPa for pressure, and 0.033% for density determination. The apparatus was used for measurements on the binary systems (nitrogen + carbon dioxide) and (argon + carbon dioxide). The compositions for both systems were (0.05 and 0.01) mole fraction carbon dioxide. Density measurements were carried out at temperatures from (298.15 to 423.15) K with pressures from (11 to 31) MPa. The relative combined expanded uncertainty (k = 2) in density was 0.15% for the (nitrogen + carbon dioxide) mixtures and 0.12% for the (argon + carbon dioxide) mixtures. A major contribution to this uncertainty emerged from the uncertainty in the gas mixture composition. The new experimental data were compared to the GERG-2008 equation of state (EOS) for natural-gas mixtures as implemented in the NIST REFPROP database and to the EOS-CG, another new Helmholtz energy model for CCS mixtures as implemented in the TREND software package of Ruhr-University Bochum. Relative deviations were mostly within 0.5%. The agreement of the new density values with the only available literature data closest to the composition range under study was better than 0.1%. |
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| Keywords: | Single-sinker densimeter Fluid density Binary mixture Carbon dioxide Nitrogen Argon |
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