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Advisor(s)
Abstract(s)
Biodiesel production is performed in the industry by alkaline transesterification of oils with a low amount of free
fatty acids. In order to reduce the disposal of conventional catalysts used industrially, ionic liquids (ILs) have
been studied to be applied as catalysts in transesterification since they can be recovered and reused in subsequent
reaction cycles. In this work, the ionic liquid choline hydroxide (ChOH) was successfully applied as a catalyst for
the transesterification reaction of triacylglycerols present in sunflower oil with methanol. A kinetic modeling
study under the specific conditions of 2 wt% catalyst dosage, 1:10 oil/methanol molar ratio, for 0–120 min at
35–65 ℃ was conducted, and liquid–liquid extraction with water/butanol was evaluated as a process to recover
the IL. A 95.0% ester yield content was achieved in this work for a short reaction time (30 min). Furthermore, the
results of the kinetic study demonstrated that a first-order model was the best fit for the reaction with a rate
constant (k) estimated as 0.1182 min 1 and activation energy (Ea) of 13.64 kJ/mol. For the tested conditions, the
complete recovery of the IL using liquid–liquid extraction did not occur since it is noted the presence of ChOH in both phases.
Description
Keywords
Biodiesel production Transesterification Ionic liquids Choline Hydroxide
Citation
Lima, Ana Carolina; Hachemane, Khadidja; Ribeiro, António E.; Queiroz, Ana; Gomes, Maria Carolina Sérgi; Brito, Paulo (2022). Evaluation and kinetic study of alkaline ionic liquid for biodiesel production through transesterification of sunflower oil. Fuel. ISSN 0016-2361. 324, p. 1-8
Publisher
Elsevier