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Kinetic evaluation of the esterification of fatty acids to biodiesel

The free fatty acids of cotton seed oil were processed with methanol and ethanol into the corresponding alkyl fatty esters in the presence of diluted sulfuric acid. The products characterized as biodiesels presented higher mass fraction levels (43.0 wt%) of the alkyl linoleates, and 17.0 and 13.0 wt...

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Published in:Reaction kinetics, mechanisms and catalysis mechanisms and catalysis, 2012-10, Vol.107 (1), p.39-48
Main Authors: Araújo, Frederico A. D., Pereira, Sonia V., Sales, Deivson C. S., Schuler, A. R., Abreu, Cesar A. M.
Format: Article
Language:English
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Summary:The free fatty acids of cotton seed oil were processed with methanol and ethanol into the corresponding alkyl fatty esters in the presence of diluted sulfuric acid. The products characterized as biodiesels presented higher mass fraction levels (43.0 wt%) of the alkyl linoleates, and 17.0 and 13.0 wt% of the alkyl esters C16:0 and C18:1, respectively. A model based on the mechanism of the acid esterification, and representing the evolutions of the fatty ester concentrations, was fitted to the experimental evolution results where the orders of magnitude of the kinetic parameters were quantified. The selectivities of the methyl and ethyl fatty esters in the biodiesel mixtures were compared, where the C18:2 ethyl linoleate selectivity (92.3 %) in the ethyl biodiesel was almost twice the methyl linoleate selectivity (57.3 %) in the methyl biodiesel.
ISSN:1878-5190
1878-5204
DOI:10.1007/s11144-012-0449-x