Measurement of isothermal (vapor + liquid) equilibria, (VLE) for binary (CH4 + CO2) from T = (240.35 to 293.15) K and CO2 rich synthetic natural gas systems from T = (248.15 to 279.15) K

• Methane and carbon dioxide binary vapor–liquid equilibrium experimental data were obtained.
• Vapor–liquid equilibrium experimental data were obtained for carbon dioxide (CO2) rich gas mixture.
• Prediction of mathematical model were compared against experimental data.

Isothermal vapor–liquid equilibrium (VLE) data for methane (CH4) + carbon dioxide (CO2) binary system at temperature range of (240.35–293.15) K and synthetic carbon dioxide rich natural gas mixtures at temperature and pressure range of (248.15–279.15) K and (2.81–9.05) MPa were measured in sapphire type equilibrium cell apparatus. Thermodynamic modeling of experimental data was carried out with GERG2008–equation of state (EOS) and volume-translated Peng–Robinson equation of state (VTPR–EOS) using van der Waals (vdw1) mixing rule. For CH4 + CO2 system, the temperature dependent binary interaction parameters (kij) were tuned to measured VLE data, whereas, between CO2 with other hydrocarbons the value of kij = 0 was assumed. Comparison between measured and prediction shows excellent agreement with overall lower deviations were obtained.

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