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

Liu, Xiang Yang; He, Maogang; Su, Chao; Qi, Xuetao; Lv, Nan

doi:10.1016/j.fuel.2015.04.050

Cited by 29 publications

(13 citation statements)

References 16 publications

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“…8). This is acceptable because the uncertainty of the calculated values of the heat capacity from the reference equation of state 35 is 5%; (2) the present derived values of isobaric heat capacities of methyl laurate agree with the reported data within 0.8% (systematically lower, Liu et al 42,43 ), 0.8% (systematically higher, van Bommel et al 44 ), 1.9% (systematically higher, Bogatishcheva et al 45 ), 0.52% (Pauly et al 46 ); (3) the present adiabatic coefficient of bulk compressibility of methyl laurate deviates from the data reported by Z ̇arska et al 25 within 0.16%; (4) the present thermal expansion coefficient of methyl laurate deviates from other reported data within 0.06% (Liew and Seng 17 ); 0.64% (Z ̇arska et al 25 ), 0.11% (Pratas et al 19 ), and 4% by Tat and Gerpen; 1 the present data of the adiabatic coefficient of bulk compressibility agrees within 1.7% (systematically lower, Tat and van Gerpen 33 ) and 0.01% (nonsystematic deviations, Z ̇arska et al 25 ). Thus, as reported in the present work, the measured density and speed of sound and the derived thermodynamic property data for methyl laurate and methyl stearate are in good agreement with the literature data and thermodynamically consistent, and therefore can be recommended for scientific and practical applications.…”

Section: Derived Thermodynamic Properties Of Methyl Laurate and Methy...supporting

confidence: 78%

Measurements and Reference Correlation of the Density and Speed of Sound and Derived Thermodynamic Properties of Methyl Laurate and Methyl Stearate

et al. 2022

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The density (ρ) and speed of sound (u) of two fatty acid methyl esters (FAMEs), methyl laurate and methyl stearate, were measured at temperatures from 283 to 353 K and from 313 to 353 K at atmospheric pressure, respectively. A commercial instrument, Anton Paar DSA 5000 M sound-speed analyzer (viscodensimeter), has been employed to the simultaneous measurements of the density and speed of sound of methyl laurate and methyl stearate as the primary components of biodiesel fuel. The measured values of density and speed of sound were used to calculate other derived key thermodynamic properties such as the adiabatic coefficient of bulk compressibility (βS), coefficient of thermal expansion (α P ), isothermal coefficient of bulk compressibility (βT), isochoric (C V ) and isobaric (CP ) heat capacities, enthalpy (ΔH) and entropy (ΔS) difference, partial temperature derivative of enthalpy (∂H/∂T) P and entropy (∂S/∂T) P , and the partial specific volume derivatives of internal energy (∂U/∂V) T (internal pressure) of methyl laurate and methyl stearate as a function of temperature. The measured values of density and speed of sound together with the reported data have been critically assessed for their accuracy and internal consistency and used to develop reference correlation models that are valid over a wide range of temperature (from the melting point to 353 K) and at an atmospheric pressure of 101.325 kPa. The overall uncertainties (at the 95% confidence level) of the reference correlations of the density and speed of sound of methyl laurate and methyl stearate are 0.025 and 0.045%, respectively.

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Section: Derived Thermodynamic Properties Of Methyl Laurate and Methy...supporting

confidence: 78%

Measurements and Reference Correlation of the Density and Speed of Sound and Derived Thermodynamic Properties of Methyl Laurate and Methyl Stearate

et al. 2022

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“…For example, Pt supported over alumina mechanically mixed with cesium salt of phosphotungstic acid was used as a catalyst for gasoline distillate conversion. [30] Additional examples include Pt promoted phosphotungstic acid, supported over high surface area supports, which catalyzed n-octane conversion, [31] and phosphotungstic acid supported over SBA-15 catalyst that was used for n-decane conversion. [32] Although POMs have been studied for biodiesel production via transesterification of plant oils, [33] their utilization in catalytic cracking and hydrocracking processes of plant oils, fatty acid esters or fatty acids, was not extensively investigated.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Hydrocracking -Hydrogenation of Castor Oil Fatty Acid Methyl Esters over Nickel Substituted Polyoxometalate Catalyst

et al. 2016

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Diverse methods for converting biomass into fuels are necessary for the functioning of a flexible and profitable biorefinery. Catalytic hydrocracking of fatty acids and their derivatives, which can be used as biofuels precursors, is rather scarce. In this work we introduce a highly selective hydrocracking process for castor oil fatty acid methyl esters (FAME) over a bifunctional polyoxometalate (POM) catalyst. Keggin-type polyoxometalates catalysts, with tungsten as addenda atoms, were examined in this research. Nickel substituted Keggin polyoxometalate,demonstrated the highest activity towards selective hydrocracking on a specific position in methyl ricinoleate, which is the predominant component of castor oil FAME. In addition, hydrogenation is unavoidable in this reaction and hydrogenation products, such as those with reduced double bond or without the hydroxyl group of methyl ricinoleate, are always present. The Ni-POM catalyst and other examined polyoxometalates catalysts were characterized using XRD, EDX, XPS and BET. The products were identified with GC-MS and their yields were recorded with GC.

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“…However, the average deviations with both CPA and PCPA are lower than 1.5%, so we can still conclude that both equations can describe well the VLE properties of polar nonassociating fluids. Table shows the deviations of the calculated heat capacity with two EoS from the experiments (the values of hydrogen sulfide are from the NIST correlation). ,− The results indicate that although the CPA EoS may describe well the heat capacity in some cases, it still cannot give a satisfactory performance for most components, even over relatively narrow temperature and pressure regions. An example can be found in 2-octanone, for which the deviation of the heat capacity with CPA at T = 253–333 K and p = 0.1 MPa reaches 10.6%.…”

Section: Results and Discussionmentioning

confidence: 99%

Quantification of Dipolar Contribution and Modeling of Green Polar Fluids with the Polar Cubic-Plus-Association Equation of State

Zhu

Liu

et al. 2021

ACS Sustainable Chem. Eng.

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Water, alcohols, ketones, esters, and ionic liquids are usually ranked as green solvents. There is still no consensus how to model these substances in the best manner due to their strong polarities. In this work, with a newly developed polar Cubic-Plus-Association equation of state (PCPA EoS), the influence of the dipole–dipole interaction on thermophysical properties is investigated for associating fluids (water and alcohols), polar nonassociating fluids (hydrogen sulfide, ketones, and esters), and ionic liquids. Special attention is paid to the heat capacity, which is difficult to model as a so-called second-order derivative property. The correlation capabilities of PCPA and CPA are first compared for vapor pressure, liquid density, and heat capacity for a primary evaluation of the dipole–dipole interaction. Then the contributions to residual heat capacity are estimated and compared for the individual terms of PCPA reflecting different molecular interactions. It is found that the contributions from the dipole–dipole interaction are negligible for associating compounds, while they are very important for both polar nonassociating fluids and ionic liquids as accurate heat capacities can be correlated only after they are counted in the model.

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

Cited by 29 publications

References 16 publications

Measurements and Reference Correlation of the Density and Speed of Sound and Derived Thermodynamic Properties of Methyl Laurate and Methyl Stearate

Measurements and Reference Correlation of the Density and Speed of Sound and Derived Thermodynamic Properties of Methyl Laurate and Methyl Stearate

Catalytic Hydrocracking -Hydrogenation of Castor Oil Fatty Acid Methyl Esters over Nickel Substituted Polyoxometalate Catalyst

Quantification of Dipolar Contribution and Modeling of Green Polar Fluids with the Polar Cubic-Plus-Association Equation of State

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