Totally inclusive cubic equation of state with five parameters for pure fluids |
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| Affiliation: | 1. Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, Delft 2628CD, the Netherlands;2. Netherlands Defence Academy, Het Nieuwe Diep 8, Den Helder 1781 AC, the Netherlands;3. AkzoNobel, Rijksstraatweg 31, Sassenheim 2171 AJ, the Netherlands;1. Facultad de Ciencias Exactas Físicas y Naturales, Universidad Nacional de Córdoba. Av. Velez Sarsfield 1611, Ciudad Universitaria, Córdoba X5016GCA, Argentina;2. Instituto de Investigación y Desarrollo en Ingeniería de Procesos y Química Aplicada - IPQA (UNC-CONICET), Córdoba, Argentina;3. Departamento de Ingeniería Química, Universidad Nacional del Sur (UNS), Av. Alem 1253, Bahía Blanca 8000, Argentina;4. Planta Piloto de Ingeniería Química – PLAPIQUI (UNS-CONICET), Camino “La Carrindanga” Km 7, Bahía Blanca 8000, Argentina;5. Department of Chemical Engineering, ETSEQ, Universitat Rovira i Virgili, Av. Països Catalans 26, Tarragona 43007, Spain |
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| Abstract: | A totally inclusive cubic equation of state (cubic EOS) is proposed. Although, its form is fairly simple as compared with the present cubic equations, it can include all of them as special cases. The EOS has five parameters. By fitting the experimental critical isothermal for six typical substances combining the critical conditions, the generalized expressions for the five parameters at critical temperature are established. The temperature coefficients of the five parameters for 43 substances are determined by fitting the experimental data of vapor pressure and saturated liquid density. These coefficients are correlated with the critical compressibility factor and acentric factor to obtain the generalized expressions. The predicted saturated vapor pressure, saturated liquid density, critical isothermal and coexistence curve near the critical point show that the equation gives the best results when compared with the Redlich–Kwong–Soave (RKS) and Peng–Robinson (PR) EOS. |
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