Isobaric molar heat capacities measurement of binary mixtures containing ethyl laurate and ethanol at high pressures

Abstract

A flow calorimeter was used to determine the isobaric molar heat capacities of mixtures containing ethyl laurate and ethanol at temperatures from 313.15 K to 343.15 K and pressures up to 25 MPa. The experimental system was verified by measuring the isobaric molar heat capacities of pure ethanol at different temperatures and pressures, and the relative expanded uncertainty of the measurement results was estimated to be lower than 1.45%. Then, the excess molar heat capacity which characterizes the deviation of the mixtures from the ideality was evaluated. Moreover, the excess molar heat capacities were analyzed, and a Redlich-Kister type correlation was presented for fitting. After that, absorbing the Redlich-Kister correlation, a new correlation for the isobaric molar heat capacities of mixtures was proposed, and the calculated results were compared with the experimental data. At last, to reduce the parameters used in calculation process, another correlation for the isobaric molar heat capacities of mixtures was also proposed, and a comparison of two correlations was implemented.