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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