Valorization of a high-acidity residual oil generated in the waste cooking oils recycling industries
- Álvarez-Mateos, P. 1
- García-Martín, J. F. 1
- Guerrero-Vacas, F. J. 1
- Naranjo-Calderón, C. 1
- Barrios-Sánchez, C. C. 2
- Pérez-Camino, M. C. 3
- 1 Universidad de Sevilla, España
- 2 Research Centre for Energy, Environment and Technology (CIEMAT), Spain
- 3 Instituto de la Grasa, CSIC, España
ISSN: 0017-3495, 1988-4214
Any de publicació: 2019
Volum: 70
Número: 4
Tipus: Article
Altres publicacions en: Grasas y aceites
Resum
A sludge fraction is obtained from the industries which recycle cooking oil and this sludge contains a large amount of oil with an extremely high acidity ( > 60%). In this work, we propose a scheme for methyl ester production from this residual oil consisting of the esterification of the free fatty acids followed by the transesterification of the remaining triglycerides. Esterifications were carried out with different methanol:oil molar ratios, and various catalysts in different weight ratios. The results revealed that homogeneous catalysts produced higher yields than heterogeneous ones in the esterification reaction. With the aim of improving the process, a previous triglyceride hydrolysis was assayed using lipases from Candida rugosa. Finally, the 3-stage process was performed under the most favorable conditions for each stage obtaining 84% wt. fatty acid methyl esters, which shows the potential of this residual oil as a source of biodiesel.
Informació de finançament
This work was supported by the European Union Funds under grant LIFE 13-Bioseville ENV/1113. The authors are grateful to Grupo BIOSEL for supplying the residual oil.Finançadors
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- LIFE 13-Bioseville ENV/1113
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