Mathematical modeling and experimental esterification at supercritical conditions for biodiesel production in a tubular reactor

Jesus, Anderson Alles de; Souza, Domingos Fabiano de Santana; Oliveira, Jackson Araújo de; Deus, M. S.; Silva, Maxwell Gomes da; Franceschi, Elton; Egues, Silvia Maria; Dariva, Cláudio

doi:10.1016/j.enconman.2018.06.108

Cited by 17 publications

(6 citation statements)

References 26 publications

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“…Santos et al, (2017) obtained an esters content of ∼75% at 220 °C and 10 MPa with 80 min of reaction. Jesus et al, (2018) observed that the reaction between oleic acid and ethanol yielded ∼66% esters at 200 °C with a reaction time of 30 min and pressure of 15 MPa.…”

Section: Effect Of Temperaturementioning

confidence: 99%

“…Mello et al, (2017) reported a 12% increase in the ethyl ester yield on increasing the ratio of alcohol to crambe oil hydrolyzate from 12:1 to 15:1 (molar basis) in a reaction conducted at 275 °C, for 10 min at 15 MPa. Jesus et al, (2018) conducted the reaction at 250 °C and 15 MPa and found that on increasing the ethanol:oleic acid molar ratio from 1:1 to 6:1 the conversion of FFA to esters increased by 22%.…”

Section: Effect Of Oil To Ethanol Mass Ratiomentioning

confidence: 99%

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Catalyst-free production of fatty acid ethyl esters (FAEE) from macauba pulp oil

et al. 2021

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In this study, the production of fatty acid ethyl esters (FAEE) from macauba pulp oil and pressurized ethanol was investigated. The experiments were conducted without the addition of catalyst, at 20 MPa, to determine the effect of temperature (200 to 300 °C) and the oil to ethanol mass ratio (1:1 and 1:2) on the FAEE content and different residence times (10 to 45 min). The effect of the addition of n-hexane to the oil (20 wt%) as a co-solvent was also evaluated. The use of high temperatures (275 and 300 °C) resulted in high FAEE content (∼90%). Increasing the amount of ethanol in the reaction medium contributed to the formation of esters only at operating temperatures of 200 to 250 °C. It was also observed that with the addition of co-solvent (in the oil) it was possible to obtain high amounts of FAEE in a shorter reaction time. In addition, a low content of unreacted compounds (∼8.0%) and the conversion of ∼90 and 99% of the free fatty acids and triglycerides were observed, respectively.

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Section: Effect Of Temperaturementioning

confidence: 99%

Section: Effect Of Oil To Ethanol Mass Ratiomentioning

confidence: 99%

Catalyst-free production of fatty acid ethyl esters (FAEE) from macauba pulp oil

et al. 2021

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“…It has the potential to be converted to biodiesel through esterification with alcohol. However, the high FFA in POME cannot be processed using a base catalyst since it reacts to produce soap and might complicate the process of separating esters from glycerol (Aboelazayem et al, 2019;de Jesus et al, 2018). To solve this problem, some researchers use homogeneous acid catalysts for the production of biodiesel derived from ingredients with high FFA content (Encinar et al, 2011;Gebremariam & Marchetti, 2018a).…”

Section: Introductionmentioning

confidence: 99%

Esterification of Free Fatty Acid in Palm Oil Mill Effluent using Sulfated Carbon-Zeolite Composite Catalyst

Hasanudin¹,

Putri²,

Agustina³

et al. 2022

JST

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Free fatty acid esterification (FFA) in palm oil mill waste (POME) was carried out using a sulfonated carbon-zeolite composite catalyst. The catalyst is synthesized with carbon precursor obtained from molasses, which is adsorbed on the surface of the zeolite and then carbonized and sulfonated with concentrated H2SO4 to form a sulfonated carbon-zeolite catalyst composite, which will be used for the esterification catalyst and the optimization process for the esterification reaction is carried out using the response surface methodology (RSM) and experimental central composite design (CCD). Importantly, the observed independent variables were temperature, catalyst weight, and reaction time to produce fatty acid methyl ester (FAME) products. The catalyst was successfully synthesized, which was shown from the SEM characterization strengthened by the presence of a sulfate group in the FTIR results and the calculation results of high acidity properties. Optimization of FFA esterification with SCZ catalyst obtained optimal conditions with a temperature of 79oC, a catalyst weight of 3.00 g, and a reaction time of 134 minutes with a FAME product of 93.75%, considering that the viscosity of biodiesel is below that required by the API.

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“…Under these conditions, it is pertinent to consider that the radial profile of velocity and dispersion can affect the progress of the reaction in the axial direction . To overcome this deviation, the authors adopted the velocity correction from a thermodynamic perspective. , …”

Section: Introductionmentioning

confidence: 99%

“…23 To overcome this deviation, the authors adopted the velocity correction from a thermodynamic perspective. 24,25 In this study, an inert packed-bed reactor has been employed to conduct soybean transesterification reactions using ethanol under supercritical conditions. The analysis of the process intensification was performed from experimental and phenomenological perspectives to identify the influence of the bed porosity, temperature, and flow rate on the conversion.…”

Section: Introductionmentioning

confidence: 99%

Influence of Porosity in a Packed-Bed Tubular Reactor on Biodiesel Production from Soybean Oil and Supercritical Ethanol: An Experimental and Phenomenological Investigation

et al. 2019

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In the present study, the transesterification of soybean oil with ethanol under supercritical conditions was investigated using a packed-bed tubular reactor. The experiments were performed with an oil/alcohol molar ratio of 1:40, a pressure of 15 MPa, and different conditions of temperature (573–673 K), flow rate (0.5–1.0 mL/min), and bed porosity (0.32–1.0). A phenomenological model was developed to describe and analyze the results. The highest ester yield (98.99%) was obtained for the lower bed porosity (0.32), under 673 K and 0.5 mL/min with a residence time of 5.44 min. The kinetic and dispersion coefficients were estimated using the particle swarm optimization algorithm, and the model fitted the experimental data with an R 2 coefficient of 0.97. The proposed kinetic model followed the behavior of the Arrhenius equations. Low values of dispersion were observed under conditions of lower flow rate and porosity. An analysis of the model allowed us to verify that the increase of the ester yield produced occurs at small values of the Reynolds number and high Peclet numbers.

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Mathematical modeling and experimental esterification at supercritical conditions for biodiesel production in a tubular reactor

Cited by 17 publications

References 26 publications

Catalyst-free production of fatty acid ethyl esters (FAEE) from macauba pulp oil

Catalyst-free production of fatty acid ethyl esters (FAEE) from macauba pulp oil

Esterification of Free Fatty Acid in Palm Oil Mill Effluent using Sulfated Carbon-Zeolite Composite Catalyst

Influence of Porosity in a Packed-Bed Tubular Reactor on Biodiesel Production from Soybean Oil and Supercritical Ethanol: An Experimental and Phenomenological Investigation

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