Methyl Pentanoate Research Articles

Customizing reformulated gasoline using biofuel-additives to replace aromatics

Understanding the thermophysical and dynamic characteristics of hydrocarbon blends is crucial for optimizing engine performance and emissions control. By investigating the properties of blends with diverse biomass-derived oxygenates (BDO) as green fuel additives, we aim to mitigate toxic aromatic compounds in both conventional and reformulated gasoline. Experimental verification of prior molecular dynamics (MD) simulation results on gasoline+alkyl levulinate blends establishes the validity of our gasoline model, establishing MD simulations as a powerful tool for investigating blend properties. Subsequent MD simulations estimate the density, viscosity, and compressibility of three gasoline formulations blended with four BDOs (butanol, dimethyl ether, methyl ethyl ketone, and methyl pentanoate). At the molecular level, these BDOs exhibit similar solvation environments in blends, except for butanol, which influences their dynamic properties. Methyl pentanoate and butanol emerge as potent candidates for green fuel integration in conventional gasoline, albeit with limited effectiveness in low-aromatic content fuel corresponding to aromatic mole fraction of 0-0.16. Introducing butyl levulinate significantly enhances valid compositions from 18% in binary blends to 70% in ternary blends, with 100% success in one of the reformulated gasoline formulations.

Influence of binder selection on the catalytic performance of zeolite-based bifunctional catalysts for biomass catalysis

The impact of binder selection on catalytic performance of real catalyst extrudates is still limitedly shown in biomass catalysis. Herein, we have prepared two zeolite-based bifunctional extrudates (Ni/LaY-Al2O3 and Ni/LaY-SiO2). Compared with Ni/LaY-Al2O3, Ni/LaY-SiO2 shows a markedly enhanced durability and sustained performance for 936 h in the continuous liquid-phase hydrogenation of γ-valerolactone into methyl pentanoate. Complementary characterization studies reveal that choosing SiO2 as binder could efficiently mitigate metal agglomeration, coke formation and support dealumination during catalysis. These findings showcase that binder selection is essential for catalyst durability in the development of the industrial-level bifunctional catalysts for biomass valorization.

Theoretical study on low-temperature oxidation kinetics of methyl pentanoate

In order to develop reliable combustion models of biodiesel, the low-temperature oxidation kinetics of methyl pentanoate (MP), the smallest methyl ester with the negative temperature coefficient (NTC), is theoretically investigated. We use the DLPNO-CCSD(T)/CBS(T-Q)//M06-2X/cc-pVTZ and CASPT2/CBS(T-Q)//CASSCF(7e,5o)/cc-pVTZ methods to explore the potential energy surfaces (PESs) of the decomposition of different MP peroxy radicals, including dissociation, isomerization, and concerted HO2 elimination. Comparisons among the PESs of MP and other methyl esters reveal that the ester functional group inherently affects the low-temperature oxidation kinetics of methyl esters, and the energies of the species along the PESs are closely related to the active C site and the alkyl chain length. Based on the determined PESs, the pressure- and temperature-dependent rate constants for the low-temperature oxidation of MP are computed at 298−1200 K and 0.01−100 atm. The kinetic calculations suggest that the dissociation rate constants of different methyl ester peroxy radicals are similar at the same active C site, and the channels that lead to tri-molecular products are significant during the low-temperature oxidation of large methyl esters. The literature combustion model of MP is revised with our calculations. For the first time, the NTC behavior of MP is theoretically predicted by the revised model, and an excellent agreement between the predictions and the measurements reflects the reliability of the present low-temperature oxidation subset of MP.Novelty and Significance statementMethyl pentanoate (MP) is the smallest methyl ester with the negative temperature coefficient (NTC), but the low-temperature oxidation kinetics in the available combustion model of MP is still insufficient to interpret its NTC behavior. To develop a reliable combustion model for MP, the potential energy surfaces (PESs) of the decompositions of different MP peroxy radicals are investigated. Results show that the ester functional group inherently affects the low-temperature oxidation kinetics of methyl esters, and the energies of the species along the PESs are closely related to the active C site and the alkyl chain length. With our calculated rate constants, the literature combustion model is revised. For the first time, the NTC behavior of MP is theoretically predicted by the revised model, and an excellent agreement between the predictions and the measurements reflects the reliability of the present low-temperature oxidation subset of MP.

Investigations on methyl pentanoate-air mixtures confined explosion and cellularity

Combustible fuels like methyl pentanoate (MPe) could cause accidental explosions and fire. Therefore, MPe explosion characteristics have to be well characterized and understood for its safe and reliable use in industries and combustion devices. Considering this, MPe’s explosion pressure, maximum explosion pressure, rate of pressure rise, maximum rate of pressure rise, heat release rate, etc., were investigated in this study at the initial conditions of 1, 2, and 4 bar and 423 K, 453 K, and 483 K using the equivalence ratios of 0.7–1.4. The maximum explosion pressures and maximum rate of pressure rise of MPe increased as the initial pressures increased but the maximum rate of pressure rise was insignificantly affected by the initial temperature. The explosion duration decreased with a decrease in the initial pressure. The maximum heat release rate and deflagration index increased with increasing initial pressure. The MPe maximum deflagration index was 224.8 bar•m/s, which occurred at a higher initial pressure and fuel-rich mixture. Therefore, the explosion severity of MPe was enhanced at higher initial pressures and fuel-rich mixtures. Moreover, the flame cellularity study showed that MPe unstable flame crack length and cell number were more affected by increments in the initial pressure and equivalence ratio. Therefore, flame instability and cellularity would significantly influence explosion severity at higher pressures and equivalence ratios. This study’s findings provide first-hand data that could be used to further investigate and characterize MPe’s explosion risk.

Study on the stability of palladium complexes with Hemaraphos ligand and reaction kinetics in the bis-hydroalkoxycarbonylation of 1,3-butadiene

The bis-hydroalkoxycarbonylation of 1,3-butadine (BD) to synthesize dimethyl adipate offers an environmentally friendly alternative route for the production of adiponitrile. While through the study of the stability in different reaction systems proves that the nucleophilicity of “N” (pyridine group) in Hemaraphos ligand not only contributes to the stability of Pd complexes, but also promotes the formation of Pd-H active species. Moreover, based on the study of kinetics, this reaction was divided into two stages (Reaction 1: hydroalkoxycarbonylation of BD to methyl pentanoate, Reaction 2: hydroalkoxycarbonylation of methyl pentanoate to dimethyl adipate) and the qualitative kinetics for the two reaction stages was studied respectively. It was found that the reaction rate of Reaction 2 was much higher than that of Reaction 1. And even if the activation energy of the catalyst for Reaction 2 was lower than that of Reaction 1, the conversion of BD took priority when both BD and methyl pentanoate existed simultaneously in the system. Finally, the different reaction mechanisms for Hemaraphos and dtbpx was proposed and compared based on the different dynamic behaviors. The electron donor ability of “N” (pyridine group) is stronger than “O” (ester carbonyl group), which was found to be the possible reason for the two hydroalkoxycarbonylation reaction stages of Hemaraphos.

Analysis of methyl pentanoate/air mixtures spherically expanding flame intrinsic instabilities

Recently, methyl pentanoate (MPe) has been considered an alternative fuel or additive in gasoline and diesel. Therefore, before its adoption in combustion devices, its combustion characteristics have to be thoroughly understood. Intrinsic flame instability and cellularity are combustion characteristics that influence the performance of combustion devices. In this light, the intrinsic instability and cellularity of MPe/air flames were investigated at the initial pressures of 1, 2, and 4 bar, temperatures of 453 K and 483 K, and equivalence ratios of 0.7–1.4 in a constant volume combustion chamber to understand the various combustion dynamics of MPe. The instability and cellularity were examined using physicochemical characteristics such as the stretch rate, Markstein length, Lewis number, thermal expansion ratio, and flame thickness. There were slight differences in the Markstein length at the various pressures, but generally, according to the Markstein length, MPe flames were unstable at higher pressures. The Lewis number revealed that MPe flames were thermal-diffusively stable, whereas the flame thickness showed MPe flames were more unstable at 483 K and 4 bar. Also, the MPe premixed flame growth rate and stability curves were obtained using theoretical analysis. The stability curves showed that at high initial pressures and temperatures, MPe flame instability occurs early at a smaller flame radius. Moreover, the experimental and theoretical critical radii agreed well. The research results provide a concrete foundation for advancing the knowledge of methyl pentanoate combustion.

Multistructural partition function truncation and its effect on the thermal rate constants.

Thermal rate constants for the hydrogen abstraction reaction of methyl pentanoate were calculated using the multistructural canonical variational theory with small-curvature tunneling (MS-CVT/SCT). The conformational search for the stationary points generated by these reactions was performed with an algorithm that combines systematic and stochastic searches at dual-level. At the high-level (MPWB1K/6-31+G(d,p)), 244 geometries for methyl pentanoate and transition states were found. A systematic estimative of the efficiency of the truncation of multistructural rovibrational partition functions and its effects on thermal rate constants was carried out. In this analysis, we observed that rotation about -OCH3 group (ϕ4) of the ester generates unstable structures with little contribution to the magnitude of the partition function. We also estimate that the truncation of the partition functions in a small set of conformations can produce deviations up to 75% compared to converged theoretical results.

Methyl pentanoate laminar burning characteristics: Experimental and numerical analysis

This study investigated the laminar combustion characteristics of methyl pentanoate (MPe) using the constant volume combustion chamber at the initial pressures and temperatures of 1, 2, and 4 bar and 423, 453, and 483 K, respectively over the equivalence ratios ranging from 0.7 to 1.4. The experimental and simulated peak pressures showed a good trend irrespective of the disparities between both results. The experimental laminar burning velocities agreed well with the simulated laminar burning velocities. Also, laminar burning velocities at the initial temperatures and pressures up to 573 K and 8 bar, respectively were estimated using a deduced empirical formula. Last but not least, the main pathways for the decomposition of MPe were MPe → MPe2J → MPeMJ → MPe3J.

Determining the Optimal Cooking Time for Cooking Loss, Shear Force, and Off-Odor Reduction of Pork Large Intestines

The objective of this study was to determine the optimal cooking time by considering the cooking loss, shear force, and off-odor reduction of pork large intestines. Commercial pork large intestines were purchased, quartered perpendicularly, and cooked in boiling water for 40, 120, 180, and 240 min. Cooking loss of the samples increased after 240 min of cooking (10.92, p<0.05) while shear force value was lower at 240 min (4.45) compared to that at other cooking times (p<0.001). The amount of major volatile organic compounds showed a decreasing trend with increasing cooking time. In particular, the amount of methyl pentanoate (17,528.71) and methyl isobutyrate (812.51), compounds with a relatively low odor threshold, decreased significantly after 120 min of cooking and no change was observed thereafter (p<0.05). In addition, the amount of 2-pentanol (3,785.65) and 1-propanol (622.26), possibly produced by lipid oxidation, significantly decreased at the same cooking time (p<0.001). In the principal component analysis, only the 40 min cooking time was significantly different from other cooking time by high amounts of 1-propanol, 2-pentanol, and methyl isobutyrate. In conclusion, in the present study, the optimal cooking time for pork large intestines was 120 min in terms of off-odor reduction, cooking loss, and shear force.

A decoupled modeling approach and experimental measurements for pyrolysis of C6-C10 saturated fatty acid methyl esters (FAMEs)

Biodiesels are promising renewable fuels that can aid in the transition to carbon neutrality. The high molecular weight and complex composition of real biodiesel fuels complicate development of compact kinetic models needed for engine simulations. Our group previously proposed the functional group approach (FGMech) to model real-fuel combustion based on the identification of intrinsic relationships between fuel molecular structure and model parameters. Establishing these relationships requires a database consisting of the model parameters of pure fuels for training. In this work, we selected five fatty acid methyl esters (FAMEs) as target fuels, including methyl pentanoate (MPE), methyl hexanoate (MHX), methyl heptanoate (MHP), methyl octanoate (MO) and methyl nonanoate (MN). To facilitate development of an FGMech reaction scheme, a decoupling model approach is adopted here for model construction. Lumped reaction mechanisms are developed to describe the (oxidative) pyrolysis of fuels while a detailed model is used for describing the conversion of pyrolysis intermediates. To validate the present model, pyrolysis experiments for these FAMEs are conducted in a jet-stirred reactor (JSR) at 1 atm and over 790–1120 K. Both the synchrotron vacuum ultraviolet photoionization mass spectrometry (SVUV-PIMS) and gas chromatography (GC)/GC–MS are applied for measuring pyrolysis intermediates. The fuels, primary hydrocarbon and oxygenated products, secondary products including various aromatic compounds, are identified and quantified for model validation. The present model well-predicts the temperature window of fuel decomposition, and reasonably predicts the yields of most pyrolysis products under both present atmospheric conditions and high pressure conditions in literature. The agreement between the measured and predicted results indicates that the present decoupling methodology can accurately describe fuel decomposition and the evolution of intermediates under pyrolysis conditions. In addition, it is found that increasing alkyl CH2 groups in C6 to C10 FAMEs has little influence on the yields of primary oxygenated products; however, increasing yields of hydrocarbon products with increasing alkyl CH2 groups indicates that alkane chemistry becomes more important moving from MPE to MN.

Experimental Studies of Thermal Conductivity of Three Biodiesel Compounds: Methyl Pentanoate, Methyl Octanoate, and Methyl Decanoate

Experimental Studies of Thermal Conductivity of Three Biodiesel Compounds: Methyl Pentanoate, Methyl Octanoate, and Methyl Decanoate

Theoretical study on isomerization, decomposition and ring-closure reaction kinetics of methyl pentanoate radicals

A comprehensive study on the isomerization, decomposition and ring-closure reaction kinetics, as well as thermodynamic properties of methyl pentanoate radicals were carried out in this work. The M06–2X/cc-pVTZ level of theory was employed to optimize geometries and analyze frequencies for all the stationary points on the potential energy surfaces. The CCSD(T) method with two basis sets, cc-pVDZ and cc-pVTZ, was used to calculate single point energies, which were further extrapolated to the complete basis set (CBS) limit to construct the potential energy surfaces. The energy calculation results indicated that isomerization of δ-R to α-R, decomposition of γ-R to CH2C(=O)OCH3 and propene, and ring-closure reaction of δ-R to 1-methoxycyclopentanoxyl radical are the most energetically favored reactions among the studied isomerization, decomposition and ring-closure reaction channels, respectively. High pressure limit, and temperature and pressure dependent rate coefficients were determined by solving the one-dimensional energy-dependent master equations with Tsinghua University Minnesota Master Equation program (TUMME). The rate coefficients and branching ratios were found to be significantly affected by temperature and pressure. The decomposition reactions yielding small unsaturated esters or small ester radicals dominate at high temperatures, while the isomerization reactions proceeding via five- and six-membered ring saddle points, as well as the ring-closure reactions play more important roles at low temperatures. Significant discrepancies are observed between the theoretically calculated rate coefficients and estimated results. The thermochemical properties of methyl pentanoate radicals were calculated using isodesmic reaction method and atomization method together with the multistructural torsional anharmonicity partition functions. This study provides accurate kinetic and thermodynamic data on methyl pentanoate radicals, which are expected to advance our understanding of combustion chemistry of methyl pentanoate and larger methyl esters.

Implication of Sensitive Reactions to Ignition of Methyl Pentanoate: H-Abstraction Reactions by H and CH3 Radicals

Implication of Sensitive Reactions to Ignition of Methyl Pentanoate: H-Abstraction Reactions by H and CH3 Radicals

Identification of markers of sensory quality in ground coffee: an untargeted metabolomics approach

IntroductionIn the last years, consumers increased the demand for high-quality and healthy beverages, including coffee. To date, among the techniques potentially available to determine the overall quality of coffee beverages, metabolomics is emerging as a valuable tool.ObjectiveIn this study, 47 ground coffee samples were selected during the 2018 Edition of the “International coffee tasting” (ICT) in order to provide discrimination based on both chemical and sensory profiles. In particular, 20 samples received a gold medal (“high quality” group), while lower sensory scores characterized 27 samples (without medal).MethodsUntargeted metabolomics based on ultra-high pressure liquid chromatography coupled with quadrupole-time-of-flight (UHPLC-QTOF) and head space-gas chromatography coupled with mass spectrometry platforms followed by multivariate statistical approaches (i.e., both supervised and unsupervised) were used to provide new insight into the searching of potential markers of sensory quality.ResultsSeveral compounds were identified, including polyphenols, alkaloids, diazines, and Maillard reaction products. Also, the headspace/GC-MS highlighted the most important volatile compounds. Polyphenols were scarcely correlated to the sensory parameters, whilst the OPLS-DA models built using typical coffee metabolites and volatile/Maillard compounds possessed prediction values > 0.7. The “high quality” group showed specific metabolomic signatures, thus corroborating the results from the sensory analysis. Overall, methyl pentanoate (ROC value = 0.78), 2-furfurylthiol (ROC value = 0.75), and L-Homoserine (ROC value = 0.74) established the higher number of significant (p < 0.05) correlations with the sensory parameters.ConclusionAlthough ad-hoc studies are advisable to further confirm the proposed markers, this study demonstrates the suitability of untargeted metabolomics for evaluating coffee quality and the potential correlations with the sensory attributes.Graphic abstract

Comparative study on ethyl butanoate reactivity – Experimental investigation and kinetic modeling of the C6 ethyl ester

Ethyl butanoate is a representative for oxygenated hydrocarbons as they are discussed as future liquid fuels from sustainable production pathways. An in-depth understanding of the influence of oxygen on the reactivity of those fuel candidates is mandatory for the molecular design and their application in internal combustion engines. Towards this goal, ignition delay times for ethyl butanoate were measured at conditions relevant to internal combustion engines using a shock tube and a rapid compression machine. These experiments were conducted for stoichiometric mixtures with air-like conditions at pressures of 20, 30 and 40 bar and a total temperature range of 680–1260 K. A negative temperature coefficient regime was found where the ignition delay times increased with increasing temperatures for all covered pressures. To further understand the kinetics of ethyl butanoate and the influence of the ester functional group, a detailed kinetic mechanism was developed and validated against the measured ignition delay times. A good agreement between the measured data and the prediction by the newly developed mechanism was achieved. The findings of this work were then used to compare ethyl butanoate to di-ethyl carbonate, methyl pentanoate and n-heptane, which also show a seven-heavy-atom-membered main chain and have all been kinetically studied before. The differences between the molecular structures and their effect on the kinetic pathways was discussed to extract information for future fuel design. It was found that especially the inhibting effect of oxgen atoms on six-membered internal H-atom migration reactions has a significant impact on the fuel’s reactivity.

Antioxidative 2H-chromenyls attenuate pro-inflammatory 5-lipoxygenase and carbolytic enzymes: Prospective bioactive agents from Babylonidae gastropod mollusk Babylonia spirata.

Oxygenated heterocycles are emerging as valuable pharmacophores involved in the prophylaxis and treatment of several diseases elicited by the reactive oxygen species. Bioassay-led chromatographic fractionation of the organic extract of the gastropod mollusk Babylonia spirata (family Babylonidae) yielded two unprecedented 2H-chromenyl derivatives characterized as 2-(butyryloxy)-5-hydroxy-hexahydro-2H-chromene-3-methyl carboxylate (1) and (3-hydroxy-hexahydro-2H-chromen-2-yl)methyl pentanoate (2). The chromenyl derivative (1) registered significantly greater attenuation potential against pro-inflammatory 5-lipoxygenase (IC50 ~2.02mM) than those exhibited by the compound (2) (IC50 2.76mM) and the non-steroidal anti-inflammatory drug ibuprofen (IC50 4.36mM, p<.05). The compound (1) exhibited comparable antioxidant activity (IC50 1.47-1.72mM) with standard antioxidative agent α-tocopherol (IC50 1.4-1.7mM). Inhibitory potential of chromenyl derivative (1) toward α-glucosidase (IC50 1.18mM) and α-amylase (IC50 0.92mM) was greater than those displayed by 2 (IC50 1.16-1.56mM). Structure-activity relationships revealed that bioactivities of the compounds were determined by the electronic factors and hydrophilic-lipophilic balance. PRACTICAL APPLICATIONS: The marine gastropod Babylonia spirata is one of the prominent edible gastropod species harvested from the coastlines along the southwestern region of the Indian peninsula. Two 2H-chromenyl derivatives were isolated to homogeneity from the organic extract of the marine buccinid gastropod B. spirata by the bioactivity-guided chromatographic fractionation and were found to possess potential antioxidant and attenuation properties against pro-inflammatory 5-lipoxygenase and carbolytic enzymes. The attenuation properties of the 2H-chromenyls against pro-inflammatory 5-lipoxygenase showed that 2H-chromenyl analogs possessed significantly greater anti-inflammatory potential than the non-steroidal anti-inflammatory drug ibuprofen. In particular, the chromenyl derivative bearing 2H-chromene-3-methyl carboxylate framework might constitute a prospective biogenic constituent in functional food and pharmaceutical applications for use against oxidative agents, including inflammation and hyperglycemic pathologies.

Kinetic modeling of methyl pentanoate pyrolysis based on ab initio calculations.

Recently, methyl pentanoate (MP) was proposed as a viable biodiesel surrogate to petroleum-based fuels. To better understand the pyrolysis chemistry of MP, the unimolecular decomposition kinetics of MP is theoretically investigated on the basis of ab initio calculations; ten primary channels, including four intramolecular H-shifts and six C-C and C-O bond fissions, are identified. The geometries are optimized at the M06-2X/cc-pVTZ level of theory, and accurate barrier heights are determined using the DLPNO-CCSD(T)/CBS(T-Q) method, which shows a good performance against the CCSD(T)/CBS(T-Q) method with an uncertainty of 0.5 kcal mol-1 for small methyl esters. The atomization enthalpy method is adopted to obtain the thermodynamics of involved species. The Rice-Ramsperger-Kassel-Marcus/master equation theory coupled with one-dimensional hindered rotor approximation is employed to calculate the phenomenological rate constants at 500-2000 K and 0.01-100 atm. The branching ratio analysis indicates that two reactions, MP ↔ CH3OC([double bond, length as m-dash]O)CH3 + CH2CHCH3 and MP ↔ CH3OC([double bond, length as m-dash]O)CH2 + CH2CH2CH3, are the dominant channels at low and high temperatures, respectively. The model from Diévart et al. [Proc. Combust. Inst., 2013, 34(1), 821-829] is updated with our calculations, and the modified model can yield a better prediction in reproducing the ignition delay times of MP at high temperatures. This work provides a comprehensive investigation of MP unimolecular decomposition, and can serve as a prototype for understanding the pyrolysis of larger alkyl esters.

Benchmarking dual-level MS-Tor and DLPNO-CCSD(T) methods for H-abstraction from methyl pentanoate by an OH radical.

Methyl pentanoate (MP) was recently proposed as a potential biodiesel surrogate due to its negative temperature coefficient region. To provide a basis for constructing an accurate mechanism, chemical kinetics of H-abstraction from MP by an OH radical are investigated theoretically at 200-2000 K. M06-2X/cc-pVTZ is applied for geometry optimizations and frequency calculations. Given the long alkyl-chain in MP, the multi-structural torsional anharmonicity is characterized by using the dual-level MS-T method due to its relatively low computational cost and established accuracy. In particular, AM1 and M06-2X/cc-pVTZ are adopted as low-level and high-level methods in dual-level MS-T, respectively. The results of dual-level MS-T are further used to benchmark against the full high-level method (M06-2X/cc-pVTZ), leading to an uncertainty of less than 30% in the high temperature range. For the single-point energy calculations, the lower computational cost DLPNO-CCSD(T) method is first used to benchmark against the gold-standard method CCSD(T) for small methyl ester (C2-C4) + OH reaction systems, yielding an overestimation of less than 1.1 kcal mol-1 for barrier height; it is then used to refine the electronic energies for the present reaction system MP + OH. Phase-space theory and conventional transition state theory are used to calculate the H-abstraction rate constants. After compensating the uncertainty of barrier height, the calculated phenomenological H-abstraction rate constants agree well with the experimental data at 263-372 K. Branching ratio analysis indicates that the β-site H abstraction is the dominant channel at 200-1200 K due to its lowest barrier height.

Structure determination of fatty acid ester biofuelsvia in situcryocrystallisation and single crystal X-ray diffraction

In situcryocrystallisation enabled the crystal structure determination of a homologous series of low-meltingn-alkyl methyl esters Cn−1H2n+1CO2CH3.

Experimental investigations on the liquid thermal conductivity of five saturated fatty acid methyl esters components of biodiesel

Abstract The utilization of biodiesel is a promising way to replace fossil fuels, and thermal conductivity of biodiesel is a very important thermophysical property for its applications. In this work, the transient hot-wire instrument with one bare platinum wire was used to measure the thermal conductivity of five pure components of biodiesel in liquid phase at atmospheric pressure. The measured substances include methyl butyrate, methyl pentanoate, methyl caproate, methyl caprylate, and methyl pelargonate, and the temperature range was from (283 to 358) K, (285 to 362) K, (263 to 368) K, (273 to 393) K, (278 to 383) K, respectively. The total standard uncertainty of the experimental results was estimated to be less than 2% and the repeatability was better than ±0.5%. The thermal conductivity data of each substance were fitted as a function of temperature. The average absolute relative deviation and maximum absolute relative deviation between the experimental data and calculated results were 0.17% and 0.44% for methyl butyrate, 0.25% and 0.58% for methyl pentanoate, 0.16% and 0.44% for methyl caproate, 0.15% and 0.47% for methyl caprylate, 0.15% and 0.33% for methyl pelargonate, respectively.