Abstract
The success during the operation of natural gas processing plants depends on the correct estimation of thermodynamic properties of the system. This paper calculates the equilibrium curves of real and synthetic natural gas mixtures means of three Equations of State (EOS). These equilibrium curves were constructed and compared with experimental data found in the literature covered. The results showed that, above 4 MPa the Peng-Robinson equation presented a considerable deviation with respect to the experimental data, reaching an absolute error of 4.36%; therefore, the GERG2008 equation is recommended for systems that operate at high pressures when the components present in the mixture apply.
Highlights
Natural gas is a complex mixture of hydrocarbons, composed mainly of methane (CH4), with significant amounts of ethane (C2H6), propane (C3H8), butane (C4H10) and some traces of heavy hydrocarbons and certain inorganic compounds (Mokhatab, Poe, & Mak, 2015)
The discussion of results is divided into the analysis of the cricondentherm and cricondenbar points of the mixtures presented in the studies by Mørch et al (2006), Jarne et al (2004) and Avila et al (2002), the construction and comparison of equilibrium curves and the analysis of natural gas mixtures from
According to the available experimental data, it is observed that both the SRK and GERG2008 state equations have a low percentage of error when calculating the values of the maximum pressure where the liquid and gas phases coexist in equilibrium
Summary
Natural gas is a complex mixture of hydrocarbons, composed mainly of methane (CH4), with significant amounts of ethane (C2H6), propane (C3H8), butane (C4H10) and some traces of heavy hydrocarbons and certain inorganic compounds (Mokhatab, Poe, & Mak, 2015).
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