Heat capacity measurements of pure fatty acid methyl esters and biodiesels from 250 to 390 K

Isobaric Molar Heat Capacity of Ethyl Octanoate and Ethyl Decanoate at Pressures up to 24 MPa

“…Figure shows the C p of ethyl heptanoate, ethyl octanoate, and ethyl decanoate at p = 12 MPa from T = 294–385 K. The C p of these three compounds also have a similar slope as a function of temperature. For FAME, Pauly et al have concluded that the length of the molecule does not seem to affect the slope value of C p versus the temperature . The same conclusion can be drawn for FAEE from our results.…”

“…Many measurements have been carried out to determine the C p of pure fatty acid methyl or ethyl ester (FAME or FAEE), but most data were obtained at atmosphere pressure. Pauly et al have measured the C p of kinds of FAMEs at atmosphere by microdifferential scanning calorimetry. Dzida et al .…”

“…5−9 Many measurements have been carried out to determine the C p of pure fatty acid methyl or ethyl ester (FAME or FAEE), but most data were obtained at atmosphere pressure. Pauly et al 10 have measured the C p of kinds of FAMEs at atmosphere by microdifferential scanning calorimetry. Dzida et al 11 have determined the experimental C p of ethyl decanoate and ethyl octanoate at atmosphere pressure and calculated the C p at pressures up to 100 MPa by an acoustic method.…”

Heat capacities of fatty acid methyl esters from 300 K to 380 K and up to 4.25 MPa

“…Heat capacities of fatty acid alkyl esters are required for establishing enthalpy balances and the development of thermodynamic models for biodiesels [5,6]. To the best of our knowledge, there are only five sets experimental data for the heat capacities of fatty acid alkyl esters which have more than 8 carbon atoms in the fatty acid group: Deshpande et al [7] reported the heat capacity of methyl tetracaprate at 298 K; Van Bommel et al [8] reported the molar heat capacities of 13 fatty acid methyl esters from 5 K to 350 K; Zaitsau et al [9] reported the molar heat capacities of ethyl caprate from 5 K to 370 K; Pauly et al [10] reported the molar heat capacities of 7 saturated fatty acid methyl esters and 5 unsaturated fatty acid methyl esters from 250 K to 390 K; Dzida et al [11,12] reported the molar heat capacities of ethyl octanoate, ethyl caprate, ethyl laurate and ethyl tetracaprate from 285 K to 343 K. These experimental data are all measured at atmospheric pressure. For the isobaric heat capacities of methyl or ethyl esters of fatty acids at high pressure, no experimental data were reported, only Dzida et al [10,11,13] to 380 K and at pressures from 0.1 MPa to 4.25 MPa were measured with a flow calorimeter.…”

Oleorresina De Copaiba Como Materia Prima Para La Producción De Biodiésel

“…Se resalta que el refinado del aceite disminuye notablemente el Cp de la muestra, que luego de la reacción de alcoholis se incrementa nuevamente, pero presenta valores inferiores respecto de la OC cruda. Los valores de capacidad calorífica encontrados guardan relación con los valores de Cp para mezclas de metil ésteres de ácidos grasos (Pauly et al 2014).…”