Thermal decomposition and stability of fatty acid methyl esters in supercritical methanol

Shin, Hee‐Yong; Lim, Sang-Kyu; Bae, Seung Yong; Oh, Sea Cheon

doi:10.1016/j.jaap.2011.07.003

Cited by 78 publications

(28 citation statements)

References 11 publications

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“…2b, the yield of FAME was about 55% at 250 C and it was increased progressively to the highest point of about 90% by increasing temperature from 250 C to 350 C and lengthening transesterification time from 120 s to 600 s at a constant pressure of 14 MPa and methanol to oil molar ratio of 25:1. Increasing temperature above 350 C would lead to partial thermal degradation of mono-and polyunsaturated fatty acid methyl esters in the mixture such as methyl stearate, methyl oleate, and methyl linoleate, as reported previously by Shin et al [36]. Therefore, temperature of 350 C was selected as the maximum point for supercritical methanol transesterification of KSO in this work.…”

Section: Temperature and Pressurementioning

confidence: 70%

“…2b and may reveal that the thermal degradation of fatty acid methyl esters in the mixture has not occurred at temperature of 350 C for reaction time of 120e600 s. From the previous studies [36,37], it can be concluded that the extent of thermal degradation of methyl esters in the mixture is typically controlled by reaction time and temperature in the process. For example, methyl palmitate and methyl oleate remain stable at 350 C for reaction time up to 20 min and 90 min, respectively while methyl linoleate started to gradually decompose when reaction time was longer than 20 min for the same reaction temperature [36,37]. Fig.…”

Section: Experimental Runmentioning

confidence: 94%

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Optimization of catalyst-free production of biodiesel from Ceiba pentandra (kapok) oil with high free fatty acid contents

Ong

Effendi

Kurniawan

et al. 2013

Energy

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Section: Temperature and Pressurementioning

confidence: 70%

Section: Experimental Runmentioning

confidence: 94%

Optimization of catalyst-free production of biodiesel from Ceiba pentandra (kapok) oil with high free fatty acid contents

Ong

Effendi

Kurniawan

et al. 2013

Energy

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“…To calculate the degree of decomposition, the equation proposed by Vieitez et al (2008) was used. The term "decomposition" of fatty acids referred to the decrease in their percentages (determined by gas chromatography) due to the formation of other compounds, such as oxygenated compounds (Lee et al, 2012) and hydrocarbons (Shin et al, 2011).…”

Section: Methodsmentioning

confidence: 99%

Assessment of process variables on the use of macauba pulp oil as feedstock for the continuous production of ethyl esters under pressurized conditions

Colonelli

Trentini

Santos

et al. 2017

Braz. J. Chem. Eng.

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-This study evaluated the potential of macauba pulp oil (MPO) as a feedstock for continuous ester production using ethanol under pressurized conditions. Experiments were performed in order to obtain data for the effect of process variables on ethyl ester (FAEE) and free fatty acid (FFA) conversion in a catalyst-free process. From the results, it appears that the MPO to ethanol mass ratio and the pressure were the variables with more favorable effect on the evaluated response variables. The addition of n-hexane caused an increase in the production of esters; however, this had a negative effect on FFA conversion. The addition of water was unfavorable for oil processing with high acidity. In this process, esterification and transesterification occur simultaneously, and the high FFA content in MPO provides high yields (85 wt% of esters; 93% FFA conversion) at low temperature, since the esterification reaction rate is higher than the transesterification. The decomposition of fatty acids was evaluated and levels <5% were observed under the evaluated experimental conditions.

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“…The degradation of the fatty acid methyl ester (FAME) product typically occurs via radical chain scission with previous studies demonstrating that the degradation of methyl stearate and methyl oleate to shorter chain 1-alkenes and alkanes respectively will occur at reaction temperatures greater than 260 • C [6,15,16]. To circumvent the need for high energy input and the need for large masses of methanol chemical inputs, some studies have suggested the viability of the alternative utilisation of an integrated subcritical lipid hydrolysis and supercritical esterification (ISHSE) process.…”

Section: Introductionmentioning

confidence: 84%

“…Furthermore, recent studies have also established that the imposition of such high temperature conditions on supercritical transesterification reaction systems will lead to the degradation of the biodiesel product thus reducing biodiesel yield [15]. The degradation of the fatty acid methyl ester (FAME) product typically occurs via radical chain scission with previous studies demonstrating that the degradation of methyl stearate and methyl oleate to shorter chain 1-alkenes and alkanes respectively will occur at reaction temperatures greater than 260 • C [6,15,16].…”

Section: Introductionmentioning

confidence: 99%

Catalyst-Free Biodiesel Production Methods: A Comparative Technical and Environmental Evaluation

2018

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Abstract:In response to existing global focus on improved biodiesel production methods via highly efficient catalyst-free high temperature and high pressure technologies, this study considered the comparative study of catalyst-free technologies for biodiesel production as an important research area. In this study, therefore, catalyst-free integrated subcritical lipid hydrolysis and supercritical esterification and catalyst-free one step supercritical transesterification processes for biodiesel production have been evaluated via undertaking straight forward comparative energetic and environmental assessments. Energetic comparisons were undertaken after heat integration was performed since energy reduction has favourable effects on the environmental performance of chemical processes. The study confirmed that both processes are capable of producing biodiesel of high purity with catalyst-free integrated subcritical lipid hydrolysis and supercritical esterification characterised by a greater energy cost than catalyst-free one step supercritical transesterification processes for an equivalent biodiesel productivity potential. It was demonstrated that a one-step supercritical transesterification for biodiesel production presents an energetically more favourable catalyst-free biodiesel production pathway compared to the integrated subcritical lipid hydrolysis and supercritical esterification biodiesel production process. The one-step supercritical transesterification for biodiesel production was also shown to present an improved environmental performance compared to the integrated subcritical lipid hydrolysis and supercritical esterification biodiesel production process. This is because of the higher potential environment impact calculated for the integrated subcritical lipid hydrolysis and supercritical esterification compared to the potential environment impact calculated for the supercritical transesterification process, when all material and energy flows are considered. Finally the major contributors to the environmental outcomes of both processes were also clearly elucidated.

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Thermal decomposition and stability of fatty acid methyl esters in supercritical methanol

Cited by 78 publications

References 11 publications

Optimization of catalyst-free production of biodiesel from Ceiba pentandra (kapok) oil with high free fatty acid contents

Optimization of catalyst-free production of biodiesel from Ceiba pentandra (kapok) oil with high free fatty acid contents

Assessment of process variables on the use of macauba pulp oil as feedstock for the continuous production of ethyl esters under pressurized conditions

Catalyst-Free Biodiesel Production Methods: A Comparative Technical and Environmental Evaluation

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