首页> 外文OA文献 >Détermination de coefficients de partage et de limites de solubilité du méthanol dans des mélanges liquides comportant azote et hydrocarbure(s) aux conditions opératoires des unités de fractionnement du gaz naturel
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Détermination de coefficients de partage et de limites de solubilité du méthanol dans des mélanges liquides comportant azote et hydrocarbure(s) aux conditions opératoires des unités de fractionnement du gaz naturel

机译:在天然气分馏装置的运行条件下测定甲醇在含氮和碳氢化合物的液体混合物中的分配系数和溶解度极限

摘要

After natural gas treatment, methanol is found as a trace contaminant. Our objective is to determine thermodynamic properties of “hydrocarbon(s) – methanol” mixtures at operating conditions related to fractionators, at high and low temperatures. In effect, industries may be penalized financially when methanol composition is higher than 50 ppm moles in final products. Therefore, our aim is to understand phase equilibrium at specific conditions of these units. There is almost no literature for such little methanol quantities. Furthermore, thermodynamic models (predictive and with parameters adjusted for the whole composition range) do not allow correct representation of “vapor – liquid” equilibrium at infinite dilution. A “static – analytic” still with phase sampling and GC analysis is used to perform these measurements. At high temperatures, we have determined methanol partition coefficients. The equipment has been adapted, along time, to increase methanol trace quantifications (molar fractions below 1 000 ppm). A unique calibration procedure taking into account methanol adsorption during the analysis stage was developed. New measurements show that for the studied composition range and within the experimental uncertainty, total pressures of the system and methanol partition coefficients are only temperature dependant. The methanol Henry's law constants as well as infinite dilution activity coefficients in the different hydrocarbon mixtures are calculated. At low temperatures, we are interested in determining the methanol limiting solubilities in “nitrogen – hydrocarbon(s)” liquid mixtures. An apparatus is under development to realize these measurements. Our new specific measurements will be used as a basis for fractionator process simulators, to estimate as precisely as possible methanol contents inside fractionator products.
机译:天然气处理后,发现甲醇为微量污染物。我们的目标是确定在高温和低温下与分馏塔相关的操作条件下的“烃-甲醇”混合物的热力学性质。实际上,当最终产品中的甲醇成分高于50 ppm摩尔时,行业可能会受到经济上的处罚。因此,我们的目的是了解这些单元在特定条件下的相平衡。如此少的甲醇量几乎没有文献报道。此外,热力学模型(预测性的且参数已针对整个组成范围进行了调整)不允许无限稀释时正确表示“气-液”平衡。仍然使用带有相位采样和GC分析的“静态–分析”来执行这些测量。在高温下,我们已经确定了甲醇分配系数。随着时间的流逝,该设备已经进行了改进,以增加甲醇的痕量定量(低于1000 ppm的摩尔分数)。开发了一种独特的校准程序,该程序考虑了分析阶段甲醇的吸附。新的测量结果表明,对于所研究的组成范围和实验不确定性,系统的总压力和甲醇分配系数仅取决于温度。计算了不同烃混合物中的甲醇亨利定律常数以及无限稀释活性系数。在低温下,我们有兴趣确定“氮-烃”混合液中甲醇的极限溶解度。正在开发一种设备来实现这些测量。我们的新的特定测量将用作分馏塔过程模拟器的基础,以尽可能精确地估算分馏塔产品中的甲醇含量。

著录项

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    Courtial Xavier;

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  • 年度 2008
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  • 原文格式 PDF
  • 正文语种 fr
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