Volumetric properties for {(1 – x)CO 2+ xCH 4},{(1 − x)CO 2+ xN 2}, and {(1 − x)CH 4+ xN 2} at the preessures (19.94, 29.94, 39.94, 59.93, 79.93, and 99.93) MPa and the temperature 673.15 K

Densities ρ of pure CO 2, CH 4, and {(1 − x)CO 2+ xCH 4}, {(1 − x)CO 2+ xN 2} and {(1 − x)CH 4+ xN 2} were measured at the pressures (19.94, 29.94, 39.94, 59.93, 79.93, and 99.93) MPa and T= 673.15 K. The measurements were made with a custom-designed, high-pressure, high-temperature vibrating-tube densimeter. For each binary system, results were obtained at mole fraction intervals of 0.1· xfrom x= 0 to x= 1. Excess molar volumes V m Ewere calculated from the measured densities for the end members and mixtures.