Estimation of Reaction Rates of Transesterification Pathways

Pérez-Méndez, Mario Alberto; Jiménez-García, Gladys; Huirache–Acuña, R.; Maya-Yescas, Rafael

doi:10.3389/fceng.2021.673970

Cited by 2 publications

(2 citation statements)

References 17 publications

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“…This assumption is acceptable in view of the large excess of EtOH employed and the finding that the transesterification rate constants follow the order: monoglycerides > diglycerides > triglyceride. That is, the intermediate products of transesterification react with EtOH faster than the original oil to produce BD, probably because of the accompanying decreased in steric hindrance. − …”

Section: Resultsmentioning

confidence: 99%

Active Learning in the Undergraduate Chemistry Laboratory: Synthesis of Biodiesel from an Amazon Region Oil (Babassu): Keep It Simple!

et al. 2023

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An active-learning approach was employed in a project for our chemistry major students on the synthesis of biodiesel (BD) from an Amazon region oil. The project, involving activities in class and in the laboratory, was given during 8 weeks of the spring semester of 2022. The students were asked about their previous contact with the synthesis and analysis of BD, ionic liquids as solvents and catalysts, and the use of chemometrics for yield optimization. The students were asked to do a literature survey, suggesting renewable starting materials (oil and alcohol) and a homogeneous catalyst for BD synthesis. The students selected babassu oil, bioethanol, and a Brønsted acid as a taskspecific ionic liquid catalyst. As independent experimental variables, the students suggested studying the effects of reaction mixture composition (oil, alcohol, catalyst) and reaction time and temperature. Based on a second questionnaire, the students chose viscosity for the determination of the BD yield. By using design of experiment and varying the molar ratios of bioethanol/babassu oil (6−12) and catalyst/babassu oil (0.1−0.2) and reaction time (1−2 h), the students calculated the effect of these variables on BD yield. The resulting mathematical correlations were validated by using additional experiments. Measuring product viscosity, after its appropriate purification, is a simple and attractive alternative to gas chromatography, being less time-and energy-consuming. The students positively evaluated the project because of the socioeconomic importance of BD, the use of renewable starting materials, application of chemometrics for yield optimization, and they were involved in decision making.

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Section: Resultsmentioning

confidence: 99%

Active Learning in the Undergraduate Chemistry Laboratory: Synthesis of Biodiesel from an Amazon Region Oil (Babassu): Keep It Simple!

et al. 2023

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“…This design (Figure 1) was used for the transesterification of virgin soybean oil to monitor the development of the reaction in an ideal and controlled environment. A detailed pathway of the reaction was available by [37]. The parameters for the experiment design were chosen using data from the literature.…”

Section: Design For Virgin Oil Experimentsmentioning

confidence: 99%

Minimising Leachate Wastewater Generated from NaOH-Catalysed Biodiesel Synthesis from Methanol

et al. 2023

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Currently, energy generation based on fossil fuels is producing negative environmental impacts; two of the main symptoms of these impacts are water pollution and climate change. Consequently, the search for new technologies to satisfy the energy demand must have the goal to minimise possible impacts to the environment. There are alternatives with biofuels and, among them, biodiesel. The cheapest reaction pathway for biodiesel production is the transesterification of triglycerides by methanol in the presence of sodium hydroxide; however, this option can contaminate large volumes of water used in the final leach of the biodiesel product. Therefore, a feasible way of producing this biofuel while simultaneously minimising leaching water will be environmentally friendly and will improve economical savings. The present study developed an experimental design in order to minimise the addition of NaOH during biodiesel production by the basic homogeneous pathway. The best operating conditions were 46 °C, methanol in situ 7.5% v/v and NaOH 0.035 M. These conditions allowed to reduce the leaching water amount by 25% compared to techniques reported in the literature; however, the yield to biodiesel decreased from 98 wt.% to 87 wt.% when a model waste oil was used instead of virgin oil.

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Estimation of Reaction Rates of Transesterification Pathways

Cited by 2 publications

References 17 publications

Active Learning in the Undergraduate Chemistry Laboratory: Synthesis of Biodiesel from an Amazon Region Oil (Babassu): Keep It Simple!

Active Learning in the Undergraduate Chemistry Laboratory: Synthesis of Biodiesel from an Amazon Region Oil (Babassu): Keep It Simple!

Minimising Leachate Wastewater Generated from NaOH-Catalysed Biodiesel Synthesis from Methanol

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