Thermodynamic models for vapor-liquid equilibria of nitrogen + oxygen + carbon dioxide at low temperatures |
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Authors: | Jadran Vrabec Gaurav Kumar Kedia Roland Meyer-Pittroff |
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Affiliation: | a Lehrstuhl für Thermodynamik und Energietechnik, Universität Paderborn, D-33098 Paderborn, Germany b Institut für Technische Thermodynamik und Thermische Verfahrenstechnik, Universität Stuttgart, D-70550 Stuttgart, Germany c Lehrstuhl für Rohstoff- und Energietechnologie, Technische Universität München, D-85350 Freising-Weihenstephan, Germany d Competence Pool Weihenstephan, Technische, Universität München, D-85354 Freising-Weihenstephan, Germany e Laboratory for Engineering Thermodynamics, University Kaiserslautern, 67663 Kaiserslautern, Germany |
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Abstract: | For the design and optimization of CO2 recovery from alcoholic fermentation processes by distillation, models for vapor-liquid equilibria (VLE) are needed. Two such thermodynamic models, the Peng-Robinson equation of state (EOS) and a model based on Henry’s law constants, are proposed for the ternary mixture N2 + O2 + CO2. Pure substance parameters of the Peng-Robinson EOS are taken from the literature, whereas the binary parameters of the Van der Waals one-fluid mixing rule are adjusted to experimental binary VLE data. The Peng-Robinson EOS describes both binary and ternary experimental data well, except at high pressures approaching the critical region. A molecular model is validated by simulation using binary and ternary experimental VLE data. On the basis of this model, the Henry’s law constants of N2 and O2 in CO2 are predicted by molecular simulation. An easy-to-use thermodynamic model, based on those Henry’s law constants, is developed to reliably describe the VLE in the CO2-rich region. |
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Keywords: | Thermodynamics |
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