Scaled equation of state and specific thermodynamic behavior of near-critical methane–pentane binary mixture
| Autor: | B.A. Grigoriev, V. P. Voronov, E. E. Gorodetskii, V.D. Kulikov, M. Yu. Belyakov |
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| Rok vydání: | 2016 |
| Předmět: |
Chemistry
Isochoric process General Chemical Engineering General Physics and Astronomy dBc Thermodynamics 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Heat capacity Methane 0104 chemical sciences Pentane chemistry.chemical_compound Tricritical point Critical point (thermodynamics) Physical and Theoretical Chemistry 0210 nano-technology Scaling |
| Zdroj: | Fluid Phase Equilibria. 418:44-49 |
| ISSN: | 0378-3812 |
| Popis: | Phase behavior of methane–pentane mixture and anomalies of the isochoric heat capacity Cρ,x and the derivative (∂P/∂T)ρ,х have been studied experimentally in the vicinity of liquid–vapor critical point at three pentane concentrations, namely, for 0.0196, 0.0345, and 0.096 mol fraction of pentane. It has been shown that for two low pentane concentrations the behavior of the heat capacity Cρ,x and (∂P/∂T)ρ,х differs substantially from both theoretically predicted and experimentally observed behavior of the properties in other mixtures. We suggest that the reason of such unusual behavior is caused by the proximity of the mixture critical locus to the tricritical point at low pentane concentrations. On the other hand dew–bubble curves (DBC) of the methane–pentane mixtures for all studied concentrations do not exhibit any special features and thus can be described theoretically within the scope of the conventional scaling approach. |
| Databáze: | OpenAIRE |
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