Transesterification kinetics of palm olein oil using supercritical methanol

Choi, Cheong Song; Kim, Jin-Woo; Jeong, Cheol-Jin; Kim, Huiyong; Yoo, Ki‐Pung

doi:10.1016/j.supflu.2011.06.015

Cited by 47 publications

(27 citation statements)

References 15 publications

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“…In a batch-type reactor, system pressure depends on the temperature of the experiment, the oil:alcohol ratio and the amount of reactants (Boer and Bahri, 2011). To compare the results found in the literature for reactions in continuous mode, we considered the study by Choi et al (2011) that evaluated the effect of pressure on the reaction of palm olein oil using supercritical methanol. These authors reported 70% and 95% yields for pressures of 20 MPa and 35 MPa, respectively, at 623 K with an oil-to-methanol molar ratio of 1:40 and 20 min of reaction.…”

Section: Effect Of Pressurementioning

confidence: 99%

“…For reactions with other vegetable oils in continuous mode, Choi et al (2011) reported the positive effect of temperature in the range of 543 to 623 K on the methyl esters yield for transesterification performed in a plug flow reactor at 35 MPa, 25 min and palm olein oil:methanol molar ratio of 1:40, with yields of 55% and 80% at 563 K and 603 K, respectively. Vieitez et al (2011b), in the transesterification of castor oil in a tubular reactor at 20 MPa, 42 min of residence time and using an oil:ethanol molar ratio of 1:40, obtained about 28 wt% and 42 wt% of FAEE at 573 K and 598 K, respectively.…”

Section: Effect Of Temperaturementioning

confidence: 99%

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Continuous catalyst-free production of esters from Jatropha curcas L. oil under supercritical ethanol

Silva

Colonelli

Silva

et al. 2014

Braz. J. Chem. Eng.

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-In the present study, the transesterification of Jatropha oil in a continuous catalyst-free process using supercritical ethanol was investigated. Experiments were performed in a packed-bed tubular reactor by studying the effect on the reaction of temperature, pressure, water and cosolvent (n-hexane) concentrations, keeping the oil:ethanol mass ratio fixed at 1:1 for different residence times. The results demonstrated that temperature and pressure had a positive effect on fatty acid ethyl ester (FAEE) production and it was observed that the free fatty acids present in vegetable oil promote faster reaction kinetics due to simultaneous esterification and transesterification reactions. The addition of water and a cosolvent increased the FAEE yields at 573 K and 20 MPa. Within the experimental ranges investigated, water and the cosolvent decreased the decomposition of fatty acids. Appreciable reaction yields (~90 wt%) were achieved at 573 K, 20 MPa, with an oil:ethanol mass ratio of 1:1 and 10 wt% water.

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Section: Effect Of Pressurementioning

confidence: 99%

Section: Effect Of Temperaturementioning

confidence: 99%

Continuous catalyst-free production of esters from Jatropha curcas L. oil under supercritical ethanol

Silva

Colonelli

Silva

et al. 2014

Braz. J. Chem. Eng.

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show abstract

“…Several studies have reported the kinetic modeling of supercritical transesterification in batch, semi-batch, or continuous mode from various kinds of feedstocks [17][18][19][20][21]. Kusdiana and Saka [19] studied the batch transesterification of rapeseed oil to biodiesel by supercritical methanol and proposed the reaction kinetics by ignoring intermediate reactions (i.e.…”

Section: Introductionmentioning

confidence: 99%

Transesterification of leather tanning waste to biodiesel at supercritical condition: Kinetics and thermodynamics studies

Ong

Kurniawan

Suwandi

et al. 2013

The Journal of Supercritical Fluids

118

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“…According to Ong et al (2013), the negative values for ΔS ‡ may be associated with the formation of activated species in the state in which the reactants combine to form complexes, thereby reducing the number of free species. Thus, the more negative the activation entropy, the more activated complexes species are formed and, finally, the higher the reactivity (Choi, Kim, Jeong, Kim, & Yoo, 2011). Lower negative values of ΔS ‡ for both catalyst are in accordance to higher oxidative stability, mainly for the methoxide case.…”

Section: Determination Of Kinetic and Thermodynamic Parametersmentioning

confidence: 65%

<b>Evaluation of the kinetic and thermodynamic parameters of oxidation reaction in biodiesel from a quaternary mixture of raw material

et al. 2017

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ABSTRACT.A mixture of vegetable oil and animal fat as raw materials was optimized by simplexcentroid mixture design to produce a type of biodiesel with good oxidative stability, flow properties and reaction yield. Further, kinetic and thermodynamic parameters of oxidation reaction were determined by the accelerated method at different temperatures. Biodiesel produced with sodium methoxide as catalyst presented 6.5°C of cloud point, 2.0°C of pour point, and oxidative stability at 110°C equal to 8.98h, with a reaction yield of 96.04%. Activation energy of the oxidation reaction was 81.03 kJ mol ) showed that the process of degradation of this biofuel was slower than that produced with NaOH. The mixture of raw materials proposed, transesterified with the methoxide catalyst, resulted in a biofuel that resisted oxidation for longer periods, making unnecessary the addition of antioxidant Keywords: oxidative stability, animal fat, vegetable oil, catalyst.Avaliação dos parâmetros cinéticos e termodinâmicos da reação de oxidação em biodiesel de uma mistura quaternária de matérias-primas RESUMO. Com o objetivo de produzir um biodiesel com boas características de estabilidade oxidativa, propriedades de fluido e rendimento de reação, uma mistura de óleo vegetal e gordura animal de matérias-primas foi otimizada por delineamento de mistura simplex-centroide. Adicionalmente, os parâmetros cinéticos e termodinâmicos da reação de oxidação foram determinados pelo método acelerado em diferentes temperaturas. O biodiesel produzido com metóxido de sódio como catalisador apresentou ponto de névoa igual a 6,5°C, ponto de fluidez de 2,0°C, estabilidade oxidativa de 8,98h, com rendimento de reação de 96,04%. A energia de ativação da reação de oxidação foi de 81,03 kJ mol ) mostra que a degradação deste biocombustível é mais lenta que o daquele produzido com NaOH. A mistura de matérias-primas proposta, transesterificada com o catalisador metóxido, resulta em biocombustível que é resistente à oxidação por longos períodos, tornando a adição de antioxidante desnecessária.Palavras-chave: estabilidade oxidativa, gordura animal, óleo vegetal, catalisador.

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Transesterification kinetics of palm olein oil using supercritical methanol

Cited by 47 publications

References 15 publications

Continuous catalyst-free production of esters from Jatropha curcas L. oil under supercritical ethanol

Continuous catalyst-free production of esters from Jatropha curcas L. oil under supercritical ethanol

Transesterification of leather tanning waste to biodiesel at supercritical condition: Kinetics and thermodynamics studies

<b>Evaluation of the kinetic and thermodynamic parameters of oxidation reaction in biodiesel from a quaternary mixture of raw material

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