Measurement and Calculation of CO2 Frost Points in CH4 + CO2/CH4 + CO2 + N2/CH4 + CO2 + C2H6 Mixtures at Low Temperatures

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• 作者：Xiaojun Xiong ; Wensheng Lin ; Rong Jia ; Yang Song ; Anzhong Gu
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2015
• 出版时间：November 12, 2015
• 年：2015
• 卷：60
• 期：11
• 页码：3077-3086
• 全文大小：481K
• ISSN：1520-5134

文摘

In published literature, only very limited data for CO₂ frost point in natural gas mixture can be found. Measurements and calculations for CH₄ + CO₂/CH₄ + CO₂ + N₂/CH₄ + CO₂ + C₂H₆ mixtures over a wide range of temperature, pressure, and compositions were performed in this work. The measurements were conducted through a simple equilibrium cell by static analytic method utilizing sampling technique. The calculations were carried out by fugacity balance model based on Peng鈥揜obinson (PR) equation of state (EoS) with van der Waals mixing rule. The calculated results agree well with the experimental results, demonstrating the reliability of PR EoS based model. By comparing data obtained from gas mixtures with different nitrogen contents and ethane contents, it is found that both nitrogen and ethane have little effect on CO₂ frost point. However, the maximum pressure for CO₂ frosting in CH₄ + CO₂ + N₂ ternary mixture increases with nitrogen content; oppositely, it decreases with ethane content in CH₄ + CO₂ + C₂H₆ ternary mixture.