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Calculation of Gas-Liquid Critical Curves for Binary Systems Containing Methane

Calculation of Gas-Liquid Critical Curves for Binary Systems Containing Methane
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摘要 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. 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 typeⅠ, 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.
出处 《Transactions of Tianjin University》 EI CAS 2009年第4期276-282,共7页 天津大学学报(英文版)
基金 Supported by National Natural Science Foundation of China (No 20476071)
关键词 critical curves binary systems METHANE CALCULATION 临界曲线 计算数据 联合系统 甲烷 分子间相互作用 液体 组分 气体
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参考文献10

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