Measurement of sound speed in methyl caprate, methyl laurate and methyl myristate

Methyl caprate, methyl laurate and methyl myristate were considered as the main components of biodiesel. The sound speed in fatty acid methyl esters (FAMEs) is one of the necessary parameter for optimizing the injection process and calculating the isoentropic compressibility. Nevertheless, the sound speed in methyl caprate, methyl laurate and methyl myristate are scarce in the literature. The sound speeds in the three FAMEs were measured by employing Brillouin light scattering method. The measurements were carried out at temperature ranging from 288.15 to 498.15 K along 4 isobaric lines 0.1, 2.5, 5.5 and 8.5 MPa. The change regularities of sound speed in methyl caprate, methyl laurate and methyl myristate with temperatures and pressures were analyzed, respectively. A rational function as function of pressure and temperature was used to correlate the experimental sound speed in the measured p-T region. Comparing the experimental sound speed with the correlation results, the absolute average deviations (AADs) are 0.17% for methyl caprate, 0.10% for methyl caprate and 0.15% for methyl myristate.