非随机双液模型
热力学
状态方程
化学
相(物质)
混合(物理)
二氧化碳
新闻自由
杂质
碳纤维
材料科学
活度系数
物理化学
有机化学
水溶液
物理
复合材料
复合数
量子力学
作者
Valderio Cavalcanti Filho,Antonin Chapoy,Rhoderick William Burgass
标识
DOI:10.1016/j.jngse.2020.103654
摘要
An experimental and modelling investigation of water content in CO2+CH4 and CO2-rich mixtures in equilibrium with hydrates or liquid water was carried out at temperatures between 233.15 and 288.15 K at pressures up to 15 MPa. Some measurements were undertaken in two-phase region, in the presence of hydrates, with liquid and vapour compositions also reported. Predictions from cubic-plus association SRK, SRK incorporating NRTL with Huron-Vidal mixing rules and multiparametric EoS-CG/GERG equations of state were compared with experimental data. In comparison with pure carbon dioxide, the addition of small amounts of impurities (permanent gases and/or hydrocarbons) resulted in a significant reduction in the water content of the fluid phases present. Overall, sCPA showed good agreement with experimental data, although SRK-HV-NRTL gave better results for some cases, despite the use of only two adjustable parameters. By contrast, multiparametric EoS-CG yielded poor representation of the experimental data. In the two-phase region, no matter the equation of state used, a tendency to underestimate water content in the liquid phase was observed.
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