天然气组分在醇和水中溶解度的模型化研究

将溶液缔合理论和PT状态方程相结合 ,建立了用于计算气体在醇、水溶液中溶解度的热力学模型 ,并对水、醇等缔合物质的模型参数进行了回归。应用新建热力学模型对水、醇等纯缔合物质的饱和蒸汽压和饱和液体体积进行了计算 ,并对甲烷、乙烷、氮气和二氧化碳在水、甲醇、乙二醇中的溶解度进行了预测。将预测结果与文献值及PT状态方程、Anderko模型和Pires模型的计算结果进行了比较。结果表明 ,用该模型可更准确地计算水、醇等缔合体系的饱和蒸汽压、饱和液相体积及预测气体在水、醇中的溶解度

Model equation for solubility of natural gas components in water and alcohol

The solution association theory was combined with Patel-Teja (PT) equation of state, and a new thermodynamic model equation for calculating solubility of natural gas components in water or alcohol was developed. The parameters of the new state equation including the phase equilibrium data of pure association substances such as water or alcohol were regressed. The new model equation was used to calculate the saturated vapor pressure and the saturated liquid volume of pure association substances and to predict the solubility of gases such as methane, ethane, nitrogen and carbon dioxide in water, methanol and ethylene glycol. The calculated results from the new model equation were compared with the experimental data and the results obtained from the PT state equation and Anderko and Pires models. It is shown that the new model equation could accurately calculate the saturated vapor pressure and saturated liquid volume of pure association substances. The solubility of natural gas components in water or alcohol could be given by the new model.