Speed of Sound, Density, and Derivative Properties of Methyl Oleate and Methyl Linoleate under High Pressure

Abstract

Speeds of sound were measured for methyl oleate and methyl linoleate (C15H30O2) at pressures up to 200 MPa along isotherms ranging from (283.15 to 393.15) K. Additional density measurements were carried out by using a U-tube densimeter up to 100 MPa from (293 to 393) K. From the integration of speed of sound, density was evaluated up to 200 MPa, and the isentropic compressibility was determined in the same p–T domain. A correlation that represents both the density and the speed of sound within their experimental uncertainties is reported to evaluate both the volume and its derivatives with respect to pressure (isothermal compressibility) and temperature (isobaric expansion).

Measurement and prediction of speeds of sound of fatty acid ethyl esters and ethylic biodiesels

“…1a and 1b. Moreover, for the same chain length, the presence of unsaturated bonds in the ester molecule increases the magnitude of speed of sound as expected since this property also depends directly on the density. Due to the lack of experimental data for ethyl esters, our experimental data were only compared to those reported by Daridon et al [28] and Ndiaye et al [33,34] the data showed to be in very good agreement, presenting a deviation below ±0.20% as shown in Fig. 2.…”

Experimental Investigation and Modeling of Thermophysical Properties of Pure Methyl and Ethyl Esters at High Pressures

“…Ndiaye et al studied the acoustic and thermodynamic properties of methyl myristate, ethyl myristate, and methyl palmitate at pressures up to 100 MPa along isotherms ranging from 293.15 to 403.15 K, methyl oleate and methyl linoleate at pressures up to 200 MPa in the temperature range 283.15–393.15 K, and methyl caprate and ethyl caprate at pressures up to 210 MPa along isotherms ranging from 283.15 to 403.15 K. Tat and Van Gerpen reported speeds of sound and densities of methyl laurate at pressures up to 34.5 MPa within the temperature range 293.15–373.15 K. Moreover, Pratas et al performed measurements for methyl laurate, methyl myristate, and methyl oleate at pressures up to 45 MPa. Schedemann determined densities of methyl linoleate at temperatures between 278 and 367 K and pressures between 0.4 and 130 MPa, while Dzida et al obtained densities of ethyl caprylate, ethyl caprate, ethyl myristate, as well as ethyl laurate from speed of sound measurements at pressures up to 100 MPa within the temperature limits of 293.15–318.15 K. Recently, Zarska et al obtained densities of methyl caprylate, methyl caprate, methyl myristate, and methyl laurate from speed of sound measurements at pressures up to 100 MPa within the temperature limits 293.15–318.15 K.…”

“…A higher speed of sound and isentropic bulk modulus of biodiesel results in a quicker fuel pressure rise from the fuel pump toward the injectors, which leads to earlier injection timing and, consequently, to a higher NO x emission. 13−15 Ndiaye et al 16 studied the acoustic and thermodynamic properties of methyl myristate, ethyl myristate, and methyl palmitate at pressures up to 100 MPa along isotherms ranging from 293.15 to 403.15 K, methyl oleate and methyl linoleate 17 at pressures up to 200 MPa in the temperature range 283.15− 393.15 K, and methyl caprate and ethyl caprate 18 at pressures up to 210 MPa along isotherms ranging from 283.15 to 403.15 K. Tat and Van Gerpen 19 reported speeds of sound and densities of methyl laurate at pressures up to 34.5 MPa within the temperature range 293.15−373.15 K. Moreover, Pratas et al 20 performed measurements for methyl laurate, methyl myristate, and methyl oleate at pressures up to 45 MPa. Schedemann 21 determined densities of methyl linoleate at temperatures between 278 and 367 K and pressures between The purity of components was ascertained by comparison of the experimental densities, speeds of sound, viscosities, and refractive indices with those reported in the open literature.…”

Densities and Viscosities of Ethyl Heptanoate and Ethyl Octanoate at Temperatures from 303 to 353 K and at Pressures up to 15 MPa

“…Few data for the densities and viscosities of fatty acid alkyl esters at high pressure are available in the literature. To our best knowledge, only the density data of methyl decanoate, methyl dodecanoate, methyl tetradecanoate, methyl oleate, methyl linoleate, ethyl decanoate, and ethyl dodecanoate have been reported by Ndiaye et al, 8,9 Pratas et al, 10 Wang et al, 11 and Outcalt et al, 12 while the viscosity data of methyl decanoate, ethyl decanoate, methyl tetradecanoate, and ethyl tetradecanoate have been reported by Habrioux et al 13,14 at elevated pressure. In addition, Dzida et al 15−17 and Chum-in et al 18,19 have obtained the densities of ethyl octanoate, ethyl decanoate, ethyl dodecanoate, ethyl tetradecanoate, methyl octanoate, methyl decanoate, methyl dodecanoate, methyl tetradecanoate, methyl hexadecanoate, and methyl oleate at pressures up to 100 MPa using theoretical methods.…”