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Adsorption of methane, nitrogen, carbon dioxide and their mixtures on wet Tiffany coal

机译：蒂法尼湿煤对甲烷，氮，二氧化碳及其混合物的吸附

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Gas adsorption was measured for methane, nitrogen, CO_2 and their binary and ternary mixtures on a wet Tiffany coal sample. The measurements were conducted at 327.6 K (130.0 F) at pressures to 13.8 MPa (2000 psia). The expected uncertainties in the amounts adsorbed vary with pressure and composition. In general, average uncertainties are about 5 percent (0.01-0.08 mmol/g) for the total adsorption; however, the expected percentage uncertainties in the amount of individual-component adsorption are significantly higher for the lesser-adsorbed gas at lower molar feed concentrations (e.g. nitrogen in the 20/80 nitrogen/CO_2 system). The Langmuir/loading ratio con-elation (LRC) and the Zhou-Gasem-Robinson (ZGR) two-dimensional equation of state (EOS) are capable of representing the total adsorption for the pure, binary and ternary systems within their expected experimental uncertainties. However, the quality of fit for the individual-component adsorption varies significantly, ranging from 3 percent (0.01 mmol/g) for the more-adsorbed methane or CO_2 to 32 percent (0.01 mmol/g) for the lesser-adsorbed nitrogen. Further, the LRC and ZGR EOS predict binary adsorption isotherms, based solely on pure-fluid adsorption parameters, within twice their experimental uncertainties.
机译：在湿的Tiffany煤样品上测量甲烷，氮气，CO_2及其二元和三元混合物的气体吸附。在压力为13.8 MPa（2000 psia）的327.6 K（130.0 F）下进行测量。吸附量的预期不确定性随压力和组成的变化而变化。通常，总吸附量的平均不确定度约为5％（0.01-0.08 mmol / g）。但是，对于较低摩尔进料浓度（例如20/80氮气/ CO_2系统中的氮气）的吸附较少的气体，单个组分吸附量的预期百分比不确定性明显较高。 Langmuir /负载比对数（LRC）和Zhou-Gasem-Robinson（ZGR）二维状态方程（EOS）能够表示纯，二元和三元系统在预期的实验不确定性范围内的总吸附量。但是，单组分吸附的拟合质量变化很大，从较高吸附的甲烷或CO_2的3％（0.01 mmol / g）到吸附较少的氮气的32％（0.01 mmol / g）。此外，LRC和ZGR EOS仅在纯净流体吸附参数的实验不确定性的两倍范围内预测了二元吸附等温线。

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