Experimental and kinetic modeling of acid oil (trans)esterification in supercritical ethanol

Santos, Kallynca Carvalho dos; Hamerski, Fabiane; Voll, Fernando Augusto Pedersen; Corazza, Marcos L.

doi:10.1016/j.fuel.2018.03.102

Cited by 17 publications

(6 citation statements)

References 52 publications

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“…In a study conducted by , increased ester yields were observed on increasing the temperature from 250 to 300 °C, with a difference of ∼42% in only 10 min of reaction. A similar result was reported by Santos et al, (2018) with a 30% increase in the ester yield for the same temperature range. In addition, Zhou et al, (2017) and Akkarawatkhoosith et al, (2019a) obtained an increased ester content of ∼60% on increasing the operating temperature from 250 to 300 ºC.…”

Section: Effect Of Temperaturesupporting

confidence: 89%

“…For all conditions evaluated, high TG conversions were achieved, with contents in these compounds in the samples obtained being below 0.14 wt%. In other studies on the transesterification reaction under pressurized conditions conducted at the same temperature, the TG contents of 0.2 to 22 wt% (Santos et al, 2018;Trentin et al, 2011;Trentini et al, 2019;Vieitez et al, 2010) were detected under the conditions that provided maximum ester yields.…”

Section: Triglyceride Diglyceride and Monoglyceride Contentsmentioning

confidence: 76%

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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 Temperaturesupporting

confidence: 89%

Section: Triglyceride Diglyceride and Monoglyceride Contentsmentioning

confidence: 76%

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

et al. 2021

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“…Umar et al reported the higher biodiesel yielding through high acidity feedstock 51 . Also, Santos et al claimed with increasing FFA content, the yield and reaction rate also increased 82 . Table 4 presents the various feedstocks with their respective Fatty acid profile, which shows these feedstocks' suitability for this method.…”

Section: The Parameters Affecting Transesterification Reaction In the Scf Methodsmentioning

confidence: 83%

Supercritical transesterification route for biodiesel production: Effect of parameters on yield and future perspectives

Singh

Kumar

Gautam

2021

Env Prog and Sustain Energy

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Catalyst‐free biodiesel production through supercritical transesterification is faster with the high conversion and a more environment‐friendly route than conventional catalyst transesterification. Improving and exploring the new possibilities in this alternative biodiesel production method by including newly available technology will lead us to a more sustainable future. In this paper, supercritical transesterification of biodiesel production has been reviewed in detail. The different parameters of this method, such as temperature, pressure, molar ratio, alcohol types, and residence time which affect the yielding and quality of fuel, have been reviewed. Besides, recycling the energy and suitable feedstock for this method has also been explored to reduce the intensive energy demand and operating cost. Furthermore, light has also thrown on co‐solvents effect on this method to reduce the extreme reaction conditions required. At last, the review concludes future recommendations in supercritical transesterification along with the challenges in energy integration and recycling.

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“…The contents in intermediate compounds (DG and MG) obtained using a reaction step was 0.46 wt%, which increased to 2.50-2.53 wt%; while the content in triglycerides decreased from 4.34 to 0.19-0.36 wt%. Santos et al (2018) The execution of the second reaction stage for both tested catalysts was effective, and resulted in an increase in the ester content, low decomposition and still low content of unreacted compounds, proving the efficiency of the application of this process. According to the ANP 45/2014 (Brazil) (ANP, 2014) the limit for MG, DG and TG in biodiesel is 0.70, 0.20 and 0.20 wt%, respectively, so the values obtained for MG and TG are in accordance with the legislation.…”

Section: Two-step Reactionmentioning

confidence: 82%

Study of the operational conditions for ethyl esters production using residual frying oil and KF/clay catalyst in a continuous system

et al. 2022

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The transesterification of residual frying oil (RFO) with pressurized ethanol was carried out in a continuous reactor containing KF/clay as a heterogeneous catalyst. In the experiments, different oil:ethanol mass ratios were evaluated at 275 and 300 ºC and 20 MPa. In the sequence, the operational stability of the catalyst was evaluated for 8 hours, as well as the conduct of the reaction in two steps (testing new and recycled catalyst). An esters yield of ~90% was achieve at 275 ºC, for15 min and at 1:1.5 oil:ethanol mass ratio. Under these conditions, the catalyst provided a stable yield in the first 3 hours of operation, and a total decrease of 29% after 8 hours. This result can be attributed mainly to the leaching of the K+ cations for the reactions in which the catalyst was exposed to long operating times. The two-step reaction served to increase the RFO conversion to esters, with low thermal decomposition.

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Experimental and kinetic modeling of acid oil (trans)esterification in supercritical ethanol

Cited by 17 publications

References 52 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

Supercritical transesterification route for biodiesel production: Effect of parameters on yield and future perspectives

Study of the operational conditions for ethyl esters production using residual frying oil and KF/clay catalyst in a continuous system

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