Vapor–liquid critical properties of multi-component mixtures containing carbon dioxide and n-alkanes |
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| Institution: | 1. College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, P. R. China;2. Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions, Chengdu 610059, P. R. China;1. Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China;2. Department of Human and Engineered Environmental Studies, Graduate School of Frontier Science, The University of Tokyo, 5-1-5 Kashiwanoha, Chiba 277-8563, Japan;1. Thermophysical Properties Division, Geothermal Research Institute of the Russian Academy of Sciences, 39 A Shamil Ave., Makhachkala, Dagestan 367030, Russia;2. Dagestan State University, Makhachkala, Dagestan, Russia |
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| Abstract: | Vapor–liquid critical temperatures, pressures and densities of multi-component mixtures containing CO2 and n-alkanes (C4–C7) were measured in a high-pressure view cell by direct visual observations. The molar ratio of alkanes was fixed during the experiment while the composition of CO2 was varied over the whole range. The critical loci show type I fluid phase behavior if the n-alkanes mixture is treated as a pseudo-continuous component, while correspondingly, CO2 is a discrete component. The critical properties were calculated by Redlich–Kwong–Soave equation of state (SRK) combined with a renormalization group correction (RG). The predictions of critical properties by SRK + RG are in good agreement with the experimental results. |
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