Experimental density and an improved Helmholtz-energy-explicit mixture model for (CO2 + CO)
Autor: | Roland Span, J. P. Martin Trusler, Stefan Herrig, Lorena F.S. Souza |
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Rok vydání: | 2019 |
Předmět: |
Materials science
Energy 020209 energy Mechanical Engineering Experimental data Thermodynamics 02 engineering and technology Building and Construction Function (mathematics) Management Monitoring Policy and Law Mixture model Measure (mathematics) 09 Engineering symbols.namesake General Energy Temperature and pressure 020401 chemical engineering Helmholtz free energy 0202 electrical engineering electronic engineering information engineering symbols 0204 chemical engineering 14 Economics |
Popis: | This study reports new density measurements of the (CO2 + CO) system at temperatures from (283 to 373) K and pressures up to 48 MPa for four different mixtures, with compositions ranging from (5 to 50) mol% CO. A commercial vibrating-tube densimeter was used to measure the density of each mixture as a function of pressure and temperature. Temperature and pressure were measured with expanded uncertainties (k = 2) of 0.05 K and 0.035 MPa, respectively. The relative combined expanded uncertainty (k = 2) of the density was estimated to be between (0.2 and 1.8) %, with values ≤1% for most state points. The new data significantly expand the pressure and composition ranges of the available density data for the (CO2 + CO) system. Together with recently published vapour-liquid-equilibrium data, the new data enabled the development of an improved Helmholtz-energy-explicit mixture model. The new model is based on the mathematical approach of the GERG-2008 and EOS-CG models with new adjustable parameters. As a result, the new mixture model allows for a significantly more accurate description of the thermodynamic properties of the (CO2 + CO) system than GERG-2008 and EOS-CG. A detailed comparison among our density data, experimental data from the literature and the different mixture models is presented. |
Databáze: | OpenAIRE |
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