Authors:Nataly Santos, Marileide Tavares, R. Rosenhaim, F. Silva, V. Fernandes Jr, Iêda Santos, and A. Souza
The growing petroleum deficit
requires the development of alternative fuel sources. Biodiesel is a good
alternative, as it is a biodegradable and renewable product, which obeys the
carbon cycle. In this work, the biodiesel from babassu was synthesized using
the methanol route, and characterized by physico-chemical analyses in order
to make able the investigated biodiesel to fulfill with its properties the
requirements of Brazilian National Agency for Petroleum, Natural Gas and Biofuel
(ANP). Besides gas chromatography, IR spectroscopy experiments and thermoanalytical
measurements in air and in nitrogen were done to determine the main thermal
decomposition processes and calorimetric events. The evaporation temperature
of babassu biodiesel was similar in both atmospheres, started around 52 in
air and around 60C in nitrogen.
Authors:M. Dantas, Marta Conceição, V. Fernandes Jr, Nataly Santos, R. Rosenhaim, Aldalea Marques, Iêda Santos, and A. Souza
This work evaluates the thermal and kinetic
behaviour of corn biodiesel obtained by the methanol and ethanol routes. As
to the TG curves, in air three thermal decomposition steps are for the methanol
biodiesel and two steps are for the ethanol biodiesel. These steps are related
to the evaporization and/or combustion of the methyl and ethyl esters, respectively.
The corn oil presented four thermal decomposition steps in air, and only one
step in nitrogen. These steps were attributed to the evaporization and/or
decomposition of triglycerides. The TG and DTA profiles of the biodiesel approach
the mineral diesel oil ones.