Otimização da síntese de biodiesel de óleo de sementes de graviola

• Autor(a) principal: Albuquerque, Ingredy Meneses Cavalcanti de
• Data de Publicação: 2014
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UEPB
• Texto Completo: http://tede.bc.uepb.edu.br/tede/jspui/handle/tede/2349
• topic: Biocombustíveis; Annona muricata L.; Planejamento Box-Behnken; Box-Behnken design; Biofuels; CIENCIAS AGRARIAS

Biodiesel is a fuel derived from biomass sources, among them vegetable oils from agroindustrial activities. As a promising fruit for use as bioenergy matrix in the biodiesel synthesis highlights the soursop (Annona muricata L.) due to its potential productivity in semi-arid region of Northeast Brazil, which is favored by its edaphoclimatic conditions. Thus, the aim of this work was to optimize the reaction conditions for transesterification via ethanolysis for biodiesel production from soursop seed oil. It was first performed an exploratory study using Plackett-Burman design with the following variables: reaction time, oil/alcohol molar ratio, catalyst concentration, and temperature. It was identified as statistically significant variables catalyst concentration, temperature and oil/alcohol molar ratio, which were employed in a Rotatable Central Composite Design. However, the model used to describe this process exhibited lack of fit. This drawback was overcome with the implementation of a BoxBehnken Design, whose greatest mass yield of 94.99% was obtained using 1.25% of catalyst concentration, temperature of 50 °C and oil/alcohol molar ratio of 1:10. The built model was used to establish an optimal experiment, at a 95% confidence level, with a 95.51% determination coefficient for the following experimental conditions: catalyst concentration of 1.18%, temperature of 52.20 °C, and oil/alcohol molar ratio of 1:8.39. Finally, the physical and chemical analysis showed the conditions for obtaining biodiesel from soursop seed oil as a promising alternative to its mixture with petroleum diesel.