Matching the critical point of associating fluids with the Cubic Plus Association equation of state
| Autor: | Xiaodong Liang, Michael Locht Michelsen, Baoliang Peng, Jianhui Luo, Georgios M. Kontogeorgis, Yuan Chen |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Single variable
010405 organic chemistry Vapor pressure Chemistry Estimation theory General Chemical Engineering General Physics and Astronomy Thermodynamics 02 engineering and technology 01 natural sciences CPA EOS 0104 chemical sciences Critical point Molar volume 020401 chemical engineering Critical point (thermodynamics) Parameter estimation Associating fluids Liquid density 0204 chemical engineering Physical and Theoretical Chemistry Critical volume |
| Zdroj: | Liang, X, Peng, B, Chen, Y, Luo, J, Michelsen, M L & Kontogeorgis, G M 2020, ' Matching the critical point of associating fluids with the Cubic Plus Association equation of state ', Fluid Phase Equilibria, vol. 526, 112674 . https://doi.org/10.1016/j.fluid.2020.112674 |
| DOI: | 10.1016/j.fluid.2020.112674 |
| Popis: | Simultaneous description of critical point, vapor pressure and liquid density with an equation of state has been a hot research topic. In this work, the possibilities and limitations of the Cubic Plus Association equation of state for describing these properties of associating fluids have been studied. First a procedure is developed to determine the energy and co-volume parameters by converting the system of three equations at the critical point to a single variable root-finding problem. The procedure is then used in parameter estimation to simultaneously match the critical temperature and pressure as well as fit the vapor pressure and liquid molar volume of typical associating fluids. The performance of the estimated parameters is subsequently compared with the parameters fitted only to vapor pressure and liquid molar volume. The possibility of introducing an extra adjustable parameter to improve the performance is further explored. The results show that, for the studied associating fluids, the Cubic Plus Association equation of state with the obtained parameters can match the critical temperature and pressure exactly, fit the vapor pressure within 2% and the liquid molar volume within 3–4% in the range of temperature up to 0.95 critical temperature, while the model overpredicts the critical volume up to 18%. |
| Databáze: | OpenAIRE |
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