Optimization of the production of ethyl esters by ultrasound assisted reaction of soybean oil and ethanol

Rodrigues, Sueli; Mazzone, Luigia; Santos, Francisco Francielle Pinheiro dos; Cruz, Márcia G.A.

doi:10.1590/s0104-66322009000200013

Cited by 27 publications

(10 citation statements)

References 12 publications

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“…The cavitation effect can slightly increase the temperature and pressure, and can promote effective interaction between the substrate and the derivative reagent, and consequently enhance chemical reactions [17]. Ultrasonic derivatization reactions have been effectively used for transesterification, silylation, and glycosylation [18][19][20][21]. Fiamegos et al [22] recently reported a detailed protocol for the esterification of amino acids in urine with the aid of ultrasonic energy.…”

Section: Introductionmentioning

confidence: 99%

An ultrasonication-assisted extraction and derivatization protocol for GC/TOFMS-based metabolite profiling

et al. 2011

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Conventional chemical derivatization of metabolites in biological specimens is time-consuming, which limits the throughput and efficiency of metabolite profiling using a gas chromatography/time-of-flight mass spectrometry (GC/TOFMS) platform. We report an ultrasonication-assisted protocol which reduces the derivatization time from hours to about 30 min and significantly enhances the derivatization efficiency prior to a GC/TOFMS analysis. The protocol was evaluated using 40 compounds representing different classes of human metabolites, and demonstrated good analytical precision and accuracy. In comparison with the conventional method, the new protocol was able to increase the intensity of most of the identified peaks (71.0%) in the GC/TOFMS chromatograms of human serum samples. The detected compounds with increased intensity include most amino acids, keto-containing organic acids, carbonyl-containing carbohydrates, and unsaturated fatty acids. We applied this protocol in a metabolomic study of human serum samples obtained from 34 patients diagnosed with hypertension and 29 age- and gender-matched healthy subjects. Metabolite markers associated with hypertension, including glucosamine, D-sorbitol, 1-stearoylglycerol, and homocysteine, were identified and validated by statistical methods and use of reference standards. Our work highlights the potential of this novel approach for the large-scale metabolite profiling of samples generated from plant, animal, and clinical and epidemiological studies.

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Section: Introductionmentioning

confidence: 99%

An ultrasonication-assisted extraction and derivatization protocol for GC/TOFMS-based metabolite profiling

et al. 2011

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“…The methanol/oil molar ratio previous studies [11][12][13]. This result can also explain why the maximum predicted theoretical conversion rate greater than previous studies [16].…”

Section: Interaction Effect Between Amount Of Catalyst (Ca) and Methmentioning

confidence: 61%

“…The application of RSM [16] yields the following r gression equation, which is an empirical relationship b tween the conversion rate of biodiesel and the test variables in the uncoded unit:…”

Section: F Regression Model Equationmentioning

confidence: 99%

Optimization of the Production of Biodiesel Assisted by Ultrasonic and Microwave

Hsiao

Lin

2013

IJEPE

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The transesterification reaction of present study was assisted by ultrasonic mixing and microwave irradiation. Central composite design (CCD) was employed to optimize the transesterification reaction conditions of biodiesel production from soybean oil. A mathematical model predicted that the theoretical conversion rate of soybean oil of 102.19% could be obtained under the following reaction conditions: amount of catalyst used, 1.4wt%; reaction temperature, 57.89 o C; and methanol/oil molar ratio, 8.11:1, assisted by 1-min ultrasonic mixing and 2-min microwave irradiation. This result indicated that there are a wide range of reaction conditions to obtain conversion rate approach 100% assisted by ultrasonic mixing and microwave irradiation. Combined the ultrasonic mixing and microwave irradiation are very efficiency process to produce biodiesel. The total reaction time was shorter than those obtained in previous studies.

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“…The commercial biodiesel production facilities mostly employ methanol (derived from fossil sources) as the reacting alcohol because of its low cost and favorable chemical and physical properties (Ma and Hanna, 1999). In contrast, ethanol is a renewable source; because it can be produced from biomass by fermentation and has similar chemical and physical properties, it has been proposed as a reacting alcohol in place of methanol (Rodrigues et al, 2009). Therefore, using ethanol provides a 100% renewable basis for biodiesel production feedstocks.…”

Section: Introductionmentioning

confidence: 99%

An entirely renewable biofuel production from used palm oil with supercritical ethanol at low molar ratio

Sakdasri

Sawangkeaw

Ngamprasertsith

2017

Braz. J. Chem. Eng.

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-The biofuel production from used palm oil (UPO) using supercritical ethanol (SCE) at low molar ratio was investigated in order to produce an entirely renewable fuel. The effects of the reaction time and ethanol to oil molar ratio were considered from 0.5 to 10 min and 6:1 to 18:1, respectively. The optimal parameters were 10 min and a 12:1 molar ratio, representing a remarkable reduction from 42:1 for the conventional SCE process. Because of the high operating temperature, the triglycerides conversion rate reached 99%, and the glycerides content met the international specification for biodiesel. However, an ester content of 70% was obtained at optimal conditions. The side reaction between glycerol and ethanol demonstrated a positive effect in increasing fuel yield by 8.15%. The product can be considered an alternative biofuel instead of biodiesel.

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Optimization of the production of ethyl esters by ultrasound assisted reaction of soybean oil and ethanol

Cited by 27 publications

References 12 publications

An ultrasonication-assisted extraction and derivatization protocol for GC/TOFMS-based metabolite profiling

An ultrasonication-assisted extraction and derivatization protocol for GC/TOFMS-based metabolite profiling

Optimization of the Production of Biodiesel Assisted by Ultrasonic and Microwave

An entirely renewable biofuel production from used palm oil with supercritical ethanol at low molar ratio

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