Determination of CO2 Solubility in Saturated Liquid CH4 + N2 and CH4 + C2H6 Mixtures above Atmospheric Pressure
Determination of CO2 Solubility in Saturated Liquid CH4 + N2 and CH4 + C2H6 Mixtures above Atmospheric Pressure
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DOI：
10.1021/je3002859
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发表时间：
2012-07
影响因子：
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通讯作者：
T. Shen;T. Gao;Wensheng Lin;A. Gu
中科院分区：
文献类型：
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作者：
T. Shen;T. Gao;Wensheng Lin;A. Gu
准确的CO2溶解度数据是实施加压液化天然气（PLNG）项目的关键。建立了一套基于静态分析法的固液平衡（SLE）装置，在常压至3 MPa的压力范围内，对应于（112 ~ 170）K的温度范围内，测定了CO2在饱和液体CH 4/CH 4 + N2/CH 4 + C2 H6中的溶解度。此外，选用Peng-Robinson（PR）和Suave-Redlich-Kwong（SRK）状态方程计算了CO2在CH 4 + N2和CH 4 + C2 H6混合气体中的溶解度，计算结果与实验数据在整个区域内一致.根据PR和SRK状态方程的实验数据，导出了CH 4 + CO2体系相互作用系数kij的两个温度关联式，提高了二元和三元固液相平衡的计算精度。
Accurate CO2 solubility data are crucial for putting a proposal of pressurized liquefied natural gas (PLNG) project into practice. A solid–liquid equilibrium (SLE) apparatus, which is based on the static–analytic method, has been set up to measure the solubility of carbon dioxide in saturated liquid CH4/CH4 + N2/CH4 + C2H6 in the pressure region from atmospheric up to 3 MPa, corresponding to the temperature region from (112 to 170) K. In addition, Peng–Robinson (PR) and Suave–Redlich–Kwong (SRK) equations-of-state (EOS) are selected to calculate the solubility of carbon dioxide in CH4 + N2 and CH4 + C2H6 mixtures, and the results are consistent with the experimental data in the whole region. Two temperature-dependent correlations for the interaction coefficients kij on CH4 + CO2 system are derived by the experimental data for PR and SRK EOS, which can improve the calculation accuracy of the binary and ternary solid–liquid phase equilibrium.