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Measurement and prediction of phase equilibria for water plus CO2 in hydrate forming conditions

机译：水合物形成条件下水与CO2相平衡的测量和预测

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CO2 solubility in H-L-W equilibria for which no reliable solubility data are available in the literature were measured together with H-L-W-V-CO2 and H-L-W-L-CO2 equilibria for water-CO2-hydrate. The pressure range was from 2 to 20 MPa and the temperature range was from 273 to 285 K. Equations of state have been applied to three-phase equilibria and to gas-rich phase in two-phase equilibria by other investigators. However, they have not been applied to H-L-W equilibria so far. In this study applicability of the lattice fluid equation of state was investigated for the unified description of various phase equilibria. With Langmuir constants in the Van der Waals and Platteeuw model for hydrates and hydrogen-bonding free energy of water fitted to data, the method was found to consistently describe various two- and three-phase equilibria of L-W-V-CO2, L-W-L-CO2, L-W-V-CO2-L-CO2, H-L-W-V-CO2/L-CO2, H-I-V-CO2, H-V-CO2-L-CO2, H-L-W, and H-V-CO2/L-CO2. With a single binary interaction parameter, good agreements between observed and calculated results were obtained except for liquid composition in CO2-rich phases for H-L-CO2 and L-W-V-CO2-L-CO2 equilibria in the vicinity of CO2 vapor pressure. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 41]
机译：测量了文献中没有可靠的溶解度数据的H-L-W平衡中的CO2溶解度，以及水-CO2-水合物的H-L-W-V-CO2和H-L-W-L-CO2平衡。压力范围为2至20 MPa，温度范围为273至285K。其他研究人员将状态方程应用于三相平衡和两相平衡中的富气相。但是，到目前为止，它们尚未应用于H-L-W平衡。在这项研究中，研究了晶格流体状态方程对各种相平衡的统一描述的适用性。在Van der Waals和Platteeuw模型中的水合物和水的氢键自由能的Langmuir常数与数据拟合的基础上，发现该方法能够一致地描述LWV-CO2，LWL-CO2，LWV的各种两相和三相平衡-CO2-L-CO2，HLWV-CO2 / L-CO2，HIV-CO2，HV-CO2-L-CO2，HLW和HV-CO2 / L-CO2。使用单个二元相互作用参数，除了在CO2蒸气压附近的H-L-CO2和L-W-V-CO2-L-CO2平衡的富CO2相中的液体组成外，观察到的结果与计算结果之间取得了良好的一致性。 （C）2000 Elsevier Science B.V.保留所有权利。 [参考：41]

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