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Isobaric heat capacity cp measurements are reported at temperatures between (108 and 168) K for liquid mixtures of CH4 (1) + C3H8 (3) at x1 ≈ 0.8 and p ≈ 5 MPa; CH4 (1) + C4H10 (4) at x1 = 0.96, 0.88, and 0.60 and p ≈ 5 MPa; and a five-component mixture that is similar in composition to a commercial mixed refrigerant at p = (1.0 and 5.0) MPa. Measurements were made, with an estimated uncertainty of about 0.02·cp, using a specialized calorimeter further modified to prevent preferential condensation of the less volatile component and minimize possible stratification of the mixture during sample loading. Our results for CH4 + C3H8 agreed within 0.02·cp of the values predicted using the GERG 2008 equation of state (EOS), whereas literature cp data over the same temperature range agree within 0.03·cp. In contrast the cp predicted for this mixture with the Peng–Robinson EOS (PR-HYSYS) shows an offset of about 0.02·cp from the average of the literature data at 165 K, which increases to 0.045·cp at 120 K. For CH4...

journal of chemical and engineering data

Isobaric Heat Capacity Measurements of Liquid Methane + Propane, Methane + Butane, and a Mixed Refrigerant by Differential Scanning Calorimetry at High Pressures and Low Temperatures