Investigation of Microwave-Assisted Transesterification Reactor of Waste Cooking Oil
In this work, the esterification and trans-esterification reactions of waste cooking oil (WCO) with high free fatty acids (FFA) ( ≥ 1% by weight) were investigated. This investigation used a two-step batch process with kinetic based reaction mechanisms and examined potential benefits of combining the conventional Fatty Acid Methyl Ester (FAME) trans-esterification method with microwave technology. Optimization of an acid-catalyzed FAME process to minimize FFA content in the feedstock found that a feed volume ratio of 0.3 L of methanol per liter of WCO, 2% grams of sulfuric acid (H2SO4) per gram of WCO for a reaction time of 200 min at a reaction temperature of 60 °C produced a biodiesel yield of 24%. By comparison, optimization of a base-catalyzed FAME process found that a feed volume ratio of 0.3 L methanol per liter WCO oil, 1 g of potassium hydroxide (KOH) per gram of WCO for a reaction time of 60 min at a reaction temperature of 60 °C produced a biodiesel yield of 93-98%. When microwave irradiation was included, the reaction time for the acid-catalyzed system was 80 min (compared to 200 min) and 10 min for the base-catalyzed system (compared to 60 min). These preliminary results suggest microwave technology merits further investigation for industrial application to biodiesel production.
A. A. Hassan and J. D. Smith, "Investigation of Microwave-Assisted Transesterification Reactor of Waste Cooking Oil," Renewable Energy, vol. 162, pp. 1735-1746, Elsevier, Dec 2020.
The definitive version is available at https://doi.org/10.1016/j.renene.2020.09.123
Chemical and Biochemical Engineering
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01 Dec 2020