Modelling of phase equilibrium of natural gas mixtures containing associating compounds

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• 作者：Eirini Petropoulou ; Georgia D. Pappa ; Epaminondas Voutsas ; ^{evoutsas@chemeng.ntua.gr}
• 关键词：Natural gas ; Associating compounds ; UMR-PRU ; CPA-PR ; Phase equilibrium
• 刊名：Fluid Phase Equilibria
• 出版年：2017
• 出版时间：15 February 2017
• 年：2017
• 卷：433
• 期：Complete
• 页码：135-148
• 全文大小：2491 K
• 卷排序：433

文摘

The effect of mixing rules and the incorporation of an association term in a cubic equation of state (EoS), on the modelling of phase equilibria of natural gas mixtures in the presence of hydrogen bonding compounds, is investigated. To this purpose, the Peng-Robinson equation of state coupled with the van der Waals one-fluid mixing rules, the UMR-PRU group contribution EoS and the CPA-PR EoS, are evaluated in the prediction of phase equilibrium in ternary and multicomponent mixtures containing natural gas components, water and methanol or monoethylene glycol. It is concluded that UMR-PRU and CPA-PR give significantly improved results over the classical Peng-Robinson EoS, indicating that the use of advanced mixing rules and the explicit implementation of an association term in a cubic EoS is important for modelling the phase equilibrium of natural gas mixtures containing associating compounds.