Calculation of gas-liquid critical curves for binary systems containing methane |
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| Authors: | Rongjiao Zhu Hongling Li Jishuang Hao Hesong Li Yiling Tian |
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| Institution: | 1. School of Sciences, Tianjin University, Tianjin 300072, China
2. School of Sciences, Tianjin University, Tianjin 300072, China;School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, China |
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| Abstract: | The critical curves for binary systems of methane combined with nitrogen, carbon monoxide, carbon dioxide, ethane, propane,
butane and water at temperatures from 125 K to 650 K and pressures from 3.5 MPa to 250 MPa were calculated by using Heilig-Franck
equation of state. This equation of state contains a repulsion term and an attraction term for intermolecular interaction.
With pairwise combination rules for these potentials, three adjustable parameters are needed. The results showed that the
critical curves of the former six binary systems belonged to type I, and CH4+H2O system belonged to type III. The calculated data were compared with the experimental data, which yielded good results for
the pressure-temperature, pressure-composition and temperature-composition behaviors of the seven systems. Moreover, the values
of the adjustable parameters were obtained from the calculation of the critical curves. They can also be used for other relevant
calculation. |
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| Keywords: | critical curves binary systems methane calculation |
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