Assessment of kinetic models in biodiesel production from cotton oil
DOI:
https://doi.org/10.6008/CBPC2179-6858.2021.002.0037Keywords:
Biodiesel, Kinetics, Cotton oilAbstract
With the growing search for substitutes for diesel fuel, due to the environmental and public health problems that oil provides, the need arises to replace diesel oil with other oils that serve as substitutes of the same efficiency and lower environmental impact. The use of kinetic models for the production of biodiesel is important for the production of biofuel. The objective of this work was to propose a model for the transesterification of cotton oil via ethyl route. The variables studied were: Temperature (50°, 60° and 70°), Molar Ratio (6/1, 10/1 and 14/1) and catalyst percentage (0.50% 0.75% and 1.0%). A factorial planning 23 was used. With an R2 = 0.9897, the model was very representative. The highest values of the ester contents were obtained when the low catalyst concentration and high molar ratio were used resulting in yields above 97 % (60°C). A first order model was adopted. The kinetic data kr = 0.2745 min-1 and Ea = 27,480 J/mol that were obtained for ethanol proved to be compatible with what was expected when it was compared to the methanol kinetic model proposed in the literature. Values for consecutive reaction constants were also obtained (k1 = 0.22 min-1; k2 = 0.67 min-1; k3 = 1.33 min-1). A kinetic study using a neural network model was also developed, which proved to be more efficient in describing the various aspects of influence on transesterification. Leading to an average error of 2.1488, and an R2 of 0.990.
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