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Rio de Janeiro, Brazil

Farias A.F.F.,Federal University of Paraiba | da Conceicao M.M.,Federal University of Paraiba | Cavalcanti E.H.S.,Institute National of Technology | Melo M.A.R.,Federal University of Paraiba | And 2 more authors.
Journal of Thermal Analysis and Calorimetry | Year: 2015

In Brazil the soybean oil is most utilized for biodiesel production due to its high production. Nevertheless, this feedstock presents low oxidative stability. This work aimed to evaluate the application of castor oil, babassu oil and beef tallow in soybean oil as an additive (<5 %) to improve thermal and oxidative stability of ethyl soybean biodiesel. The characterizations realized were gas chromatography, kinematic viscosity, thermal analysis and Rancimat. In the binary and ternary formulations were added 2–4 % (w/w) babassu oil, castor oil or beef tallow in soybean oil for promoting ethyl transesterification. Content of ester agrees with Brazilian biodiesel specification, except to soybean biodiesel with 2 % beef tallow (87.2 %). The increase in content of beef tallow in soybean oil for biodiesel synthesis led to an increase in the cloud point and pour point, mainly soybean biodiesel with addition of 4 % beef tallow. In relation to the kinematic viscosity all biodiesel formulations were in agreement with the Technical Regulation established by ANP 3/2014, except for soybean biodiesel with addition of 4 % beef tallow. Thermogravimetric curves indicated that 4 % ternary formulation was the most stable (245 °C). In relation to oxidative stability, the most stable were soybean biodiesel with 2 and 4 % beef tallow and 4 % ternary formulation. Considering thermal, oxidative and flow properties, it is suggested that 4 % ternary formulation (soybean oil additive with 2 % babassu oil and 2 % castor oil) is the most appropriate for production of biodiesel. © 2015 Akadémiai Kiadó, Budapest, Hungary Source

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