Study on isobaric specific heat capacity of ethyl octanoate under high pressure across 313-453 K

Abstract

This study experimentally determined the isobaric specific heat capacity of ethyl octanoate using flow calorimetry across 313.15 to 453.15 K at pressures up to 10 MPa, with measurement uncertainty of 0.095. Deviations from literature data were within 0.43 % at 0.1 MPa and 0.42 % under elevated pressures. By integrating literature data, a computational equation for ethyl octanoate was regressed, exhibiting deviations ≤0.42 %. Utilizing the differential relationship ${\left(\partial c_p/\partial p\right)}_T=-T{\left({\partial }^{2}v/\partial T^2\right)}_p$, a predictive model for isobaric specific heat capacity was established. This model extends the prediction of heat capacity to 100 MPa, achieving an average absolute deviation (AAD) of 0.28 % within the experimental range, demonstrating satisfactory accuracy.