Comparison of volume translation and co-volume functions applied in the Peng-Robinson EoS for volumetric corrections

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• 作者：André ; F. Young^a ; ^{young@eq.ufrj.br} ; Fernando L.P. Pessoa^a ; Victor R.R. Ahó ; n^b
• 关键词：Volume translation ; Co-volume ; Peng-Robinson
• 刊名：Fluid Phase Equilibria
• 出版年：2017
• 出版时间：15 March 2017
• 年：2017
• 卷：435
• 期：Complete
• 页码：73-87
• 全文大小：1558 K
• 卷排序：435

文摘

Cubic equations of state are largely used in the chemical industry, especially in the oil and gas industry. The preference for this type of model is, mainly, due to its simplicity and large application ranges. However, such models exhibit acknowledged deficiencies in volumetric properties prediction for liquid phases. Each year, new modifications are proposed to solve these problems. While corrections in the attractive parameter are normally related to vapor pressure calculation, a tendency that has been observed to volume correction is the use of the volume translation technique. Another option is the proposal of temperature-dependent co-volume functions. In this work, parameters are estimated for several volume translation and co-volume models applied to the Peng-Robinson equation of state. These models are compared in the saturated liquid density prediction for 56 substances, of several chemical types. An analysis of thermodynamic consistency is done for the volume translation functions, while the influence of the co-volume adjustment on vapor-pressure calculations and some problems related to parameters optimization are discussed. Among the evaluated models, the volume translation functions of Magoulas-Tassios and Abudour et al. presented the best results. The results obtained in this work are useful for the identification of tendencies and the proposal of new models.