Measurement of the (pressure,density, temperature) relation of two (methane + nitrogen) gas mixtures at temperatures between 240 and 400 K and pressures up to 20 MPa using an accurate single-sinker densimeter |
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| Institution: | 1. Grupo de Termodinámica y Calibración (TERMOCAL), Dpto. Ingeniería Energética y Fluidomecánica, E.T.S. de Ingenieros Industriales, Universidad de Valladolid, E-47071 Valladolid, Spain;2. Facultad de Ingeniería, Universidad Javeriana-Cali, Calle 18, 118-250 Cali, Colombia;3. Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK;1. Politecnico di Milano, Department of Energy, Via Lambruschini, 4, 20156 Milan, Italy;2. Université de Lorraine, Ecole Nationale Supérieure des Industries Chimiques, Laboratoire Réactions et Génie des Procédés (UMR CNRS 7274), 1 Rue Grandville, 54000 Nancy, France;1. Grupo TERMOCAL, Departamento de Ingeniería Energética y Fluidomecánica, Universidad de Valladolid, Paseo del Cauce, 59, E-47011 Valladolid, Spain;2. Laboratorio de Cartografía y Sistemas de Información Geográfica, Departamento de Geografía, Universidad de Valladolid, E-47011 Valladolid, Spain;1. BioEcoUVa, Research Institute on Bioeconomy, TERMOCAL Research Group, University of Valladolid, Escuela de Ingenierías Industriales, Paseo Del Cauce 59, 47011, Valladolid, Spain;2. BAM Bundesanstalt für Materialforschung und -Prüfung, Berlin, 12200, Germany;1. TermoCal Research Group, Research Institute on Bioeconomy, University of Valladolid, Paseo del Cauce 59, 47011 Valladolid, Spain;2. Department of Chemical Engineering, Ariel University, Ariel 40700, Israel;3. BAM Federal Institute for Materials Research and Testing, D-12200 Berlin, Germany |
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| Abstract: | Comprehensive (p, ρ, T) measurements on two gas mixtures of (0.9CH4 + 0.1N2) and (0.8CH4 + 0.2N2) have been carried out at six temperatures between 240 and 400 K and at pressures up to 20 MPa. A total of 108 (p, ρ, T) data for the first mixture and 134 for the second one are given. These measurements were performed using a compact single-sinker densimeter based on Archimedes’ buoyancy principle. The overall uncertainty in density ρ is estimated to be (1.5 · 10?4 · ρ + 2 · 10?3 kg · m?3) (coverage factor k = 2), the uncertainty in temperature T is estimated to be 0.006 K (coverage factor k = 2), and the uncertainty in pressure p is estimated to be 1 · 10?4·p (coverage factor k = 2). The equipment has been previously checked with pure nitrogen over the whole temperature and pressure working ranges and experimental results (35 values) are given and a comparison with the reference equation of state for nitrogen is presented. |
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