Abstract
The excess molar enthalpies (HE) of the binary system carbon dioxide (CO2) + butyl levulinate (a solvent obtainable from biomass) were determined near the critical point of CO2, using a flow-type isothermal microcalorimeter. Values are reported for temperatures of 298.15 and 303.15 K and pressures in the range of 5.0–7.0 MPa. A maximum exothermic value of approximately 8.1 kJ mol−1 was determined, similar to the significant exotherms observed in our previous work for other binary systems. The experimental HE data were well correlated with a composition-dependent equation and the Peng-Robinson equation of state in conjunction with the conventional mixing rule.
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