Experimental Investigation of Isobaric Specific Heat Capacity for Methyl Decanoate and Ethyl Decanoate at Temperatures from 313 to 453 K and Pressures up to 10 MPa

Abstract Biodiesel is a renewable, green alternative fuel derived from diverse feedstocks and consisting primarily of fatty acid esters. In this study, the isobaric specific heat capacities of methyl decanoate and ethyl decanoate were measured using flow calorimetry at temperatures from 313 to 453 K and pressures up to 10 MPa. The measurements were conducted along isotherms with a 20 K interval, yielding 88 experimental data per substance with a relative expanded uncertainty of 0.95% (k = 2). At atmospheric pressure, the absolute average deviation (AAD) between the measured values and literature data was 0.47% for methyl decanoate and 0.25% for ethyl decanoate. For ethyl decanoate under high pressure, the AAD was 0.09%. Based on the experimental results, correlating equations as a function of pressure and temperature were developed, yielding mean absolute deviations of 0.28% and 0.25% between the calculated and experimental values for methyl decanoate and ethyl decanoate, respectively.