Medición Y Predicción De Curvas De Puntos De Rocío Para Mezclas De Gas Natural

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Fluid Phase Equilibria 334 (2012) 1–9

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Fluid Phase Equilibria
journal homepage: www.elsevier.com/locate/fluid

Measurement and prediction of dew point curves of natural gas mixtures
Vasiliki Louli a , Georgia Pappa a , Christos Boukouvalas a , Stathis Skouras b , Even Solbraa b ,
Kjersti O. Christensen b , Epaminondas Voutsas a,∗
aLaboratory of Thermodynamics and Transport Phenomena School of Chemical Engineering, National Technical University of Athens 9, Heroon Polytechniou Str., Zografou Campus,
15780 Athens, Greece
b
Statoil ASA, R&D Centre, Trondheim, Norway

article

info

Article history:
Received 8 May 2012
Received in revised form 24 July 2012
Accepted 30 July 2012
Available online 6 August 2012Keywords:
Natural gas
Dew point
Cricondentherm temperature
Cricondenbar pressure
UMR-PRU
PR EoS
PPR78 EoS

abstract
Dew point measurements for six synthetic natural gas (SNG) mixtures were performed using a custom
made chilled mirror apparatus. The experimental data cover a temperature-range from 253 to 285 K and
a pressure-range from 3 to 105 bar. The recently developed UMR-PRU model wasrevised and applied to
these experimental data as well as to other dew point data for synthetic and two real natural gas mixtures
reported in the literature. The results of the UMR-PRU model were compared to those obtained by the
Peng–Robinson equation of state coupled with the classical van der Waals one fluid mixing rules using
either zero interaction parameters or temperature dependent onesutilized in a predictive version of the
PR EoS, the so-called PPR78 EoS.
© 2012 Elsevier B.V. All rights reserved.

1. Introduction
The knowledge of the phase diagrams of natural gas mixtures
is very important to the oil and gas industry for the design of processing and transportation facilities of natural gases. In particular,
the most important information taken from such diagrams are thecricondenbar and cricondentherm points, which are the saturation
points corresponding to the maximum pressure and the maximum temperature, respectively, on the phase envelope. For design
purposes, it is necessary to have an accurate, simple and robust
thermodynamic model for the prediction of the phase envelopes.
However, experimental dew point data are still necessary for the
verification ofthe model predictions.
The dew points of natural gas (NG) mixtures can be predicted
using appropriate thermodynamic models. Due to their simplicity
and accuracy, the most commonly used models for this purpose
are cubic equations of state (EoS) belonging to the RK [1] and PR [2]
family. Several studies on the evaluation of EoSs in the prediction
of natural gas phase envelopes have shown thatthese two EoSs are
fairly accurate and, due to their simplicity and the short computational times, they are preferable over other models which may
have a sounder theoretical basis like those derived using statistical

∗ Corresponding author. Tel.: +30 210 772 3971; fax: +30 210 772 3155.
E-mail address: evoutsas@chemeng.ntua.gr (E. Voutsas).
0378-3812/$ – see front matter © 2012 Elsevier B.V.All rights reserved.
http://dx.doi.org/10.1016/j.fluid.2012.07.028

thermodynamics, e.g. the PC-SAFT EoS [3]. Nasrifar et al. [4,5] compared various cubic EoSs, including variations of RK and PR with
respect to the function used for the attractive term parameter, in
the prediction of equilibrium properties, such as dew points and
flash yields, as well as other thermophysical properties, suchas
fugacities of supercritical compounds, compressibility factors, and
speeds of sound. They concluded that regarding the dew point predictions, no EoS appears to be best overall: the three-parameter
EoSs, like the Patel–Teja EoS, are better for rich natural gases, while
the two-parameter EoSs of the RK family are better for the lean
natural gas mixtures. The authors also pointed out that...
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