Modeling of three-phase vapor-liquid-liquid equilibria for a natural-gas system rich in nitrogen with the SRK and PC-SAFT EoS

被引：11
作者：
Justo-Garcia, Daimler N. [1 ,2 ]
Garcia-Sanchez, Fernando [1 ]
Diaz-Ramirez, Nestor L. [2 ]
Diaz-Herrera, Enrique [3 ]
机构：
[1] Inst Mexicano Petr, Lab Termodinam, Programa Invest Ingn Mol, Mexico City 07730, DF, Mexico
[2] Inst Politecn Nacl, Dept Ingn Quim Petr, Unidad Profes Adolfo Lopez Mateos, ESIQIE, Mexico City 07738, DF, Mexico
[3] Univ Autonoma Metropolitana Iztapalapa, Dept Fis, Area Fis Liquidos, Mexico City 09340, DF, Mexico
来源：
FLUID PHASE EQUILIBRIA | 2010年 / 298卷 / 01期
关键词：
PC-SAFT equation of state; Liquefied natural gas; Vapor-liquid-liquid equilibria; Gibbs energy; Stability analysis; Phase envelope; EQUATION-OF-STATE; BINARY-MIXTURES RELEVANT; GLOBAL PHASE-DIAGRAMS; ISOTHERMAL FLASH PROBLEM; CRITICAL-POINTS; MULTICOMPONENT MIXTURES; ALKANE PLUS; N-ALKANE; HYDROCARBONS;
D O I：
10.1016/j.fluid.2010.07.012
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
In this work, we present the modeling of three-phase vapor-liquid-liquid equilibria for a mixture of natural gas (Hogback gas) containing high concentrations in nitrogen (51.8 mol%) with the SRK and PC-SAFT equations of state. The interest of studying this mixture is due to the experimental evidence of the occurrence of multiple equilibrium liquid phases for this mixture over certain ranges of temperature and pressure. The calculation of the multiphase equilibria was carried out by using an efficient numerical procedure based on the minimization of the system Gibbs energy and thermodynamic stability tests to find the most stable state of the system. The results of the calculated vapor-liquid-liquid equilibria (VLLE) show that the PC-SAFT equation of state predicts satisfactorily the phase behavior that experimentally exhibits this mixture, whereas the SRK equation of state predicts a three-phase region wider than the experimentally observed. The two-phase boundary for this mixture was also calculated through flash calculations, and the results showed that this mixture does not present any gas-liquid critical point. (C) 2010 Elsevier B.V. All rights reserved.
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页码：92 / 96
页数：5
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