Navegando por Autor "Carvalho Filho, J. R."
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Artigo Influence of soybean biodiesel content on basic properties of biodiesel–diesel blends(Elsevier BV, 2009-04) Bicudo, Tatiana de Campos; Candeia, R. A.; Silva, M. C. D.; Carvalho Filho, J. R.; Brasilino, M. G. A.; Santos, I. M. G.; Souza, A. G.The world tendency in last years is to restrict the use of fossil fuels and replace them partially or totally by renewable fuels. Accordingly, biodiesel is being studied as one of the main alternatives and the production and consumption of this pure biofuel and its binary blends with fossil diesel have been markedly grown. Thus, the present work evaluated the influence of biodiesel concentration on such blends when mixed to diesel in 5, 15, 25 and 50 volume percentages. For each blend, both methanol and ethanol biodiesels were investigated. The biodiesel samples were physicochemically characterized. Their rheological behavior was analyzed. It was observed that the biodiesel enrichment leads to an acceptable increase in the viscosity and to a decrease in the volatilization of the binary blends. The viscosity was also shown to be temperature-dependent, as well as the fatty acids chain length and unsaturationArtigo Thermal investigation of oil and biodiesel fromJatropha curcasL.(Springer, 2009-06-19) Bicudo, Tatiana de Campos; Freire, L. M. S.; Rosenhaim, R.; Sinfrônio, F. S. M.; Botelho, J. R.; Carvalho Filho, J. R.; Santos, Ieda Maria Garcia dos; Fernandes Júnior., V. J.; Antoniosi Filho, N. R.; Souza, A. G.Biodiesel is susceptible to autoxidation if exposed to air, light and temperature, during its storage. Physic nut (Jatropha curcas L.) seeds show potential application for biodiesel production since its oil yields high quality biodiesel. This work aims to evaluate the thermal behavior of the physic nut oil and biodiesel, from several Brazilian crops, by means of thermoanalytical techniques. Thermogravimetry (TG) and pressurized-ifferential scanning calorimetry (PDSC) were used in order to determine the applicability of physic nut biodiesel as fuel. Results suggest that physic nut biodiesel is a practical alternative as renewable and biodegradable fuel able to be used in diesel motors