Abstract
The higher is the degree of unsaturation in ester chain of a biodiesel, the smaller is its oxidation stability. Sunflower biodiesel obtained by the ethyl route possesses a high amount of unsaturated fatty acids, mainly oleic acid (C18:1) and linoleic acid (C18:2), thus being more prone to the oxidation process. In Brazil, with the purpose of meeting the specifications of the Brazilian National Agency of Petroleum, Natural Gas and Biofuels (ANP), antioxidant additives, from synthetic and natural origins, have been added to the biofuel. Antioxidants are an alternative to prevent the oxidative deterioration of the fatty acid derivatives, as they are substances able to reduce the oxidation rate. In this study, the oxidative stability of sunflower biodiesel, obtained by the ethyl route and additivated with different concentrations of the antioxidants butylated hydroxytoluene (BHT) and t-butylhydroquinone (TBHQ), was evaluated by means of Pressure differential scanning calorimetry (P-DSC) and the Accelerated oxidative stability test (Rancimat, Method EN 14112). The results obtained by the two techniques showed the same oxidation tendency. Thus, P-DSC can be used as an alternative to determine the oxidative stability of biodiesel. The antioxidant TBHQ, added to biodiesel at the concentrations of 2000 and 2500 mg kg−1, raised the oxidation induction time to a value higher than 6 h, the limit established by the Resolution ANP number 7/2008, thus being the best alternative among the studied antioxidants.
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References
Kumar P, Robins A, ApSimon H. Nanoparticle emissions from biofuelled vehicles—their characteristics and impact on the number-based regulation of atmospheric particles. Atmos Sci Lett. 2010;11:327–31.
Haas MJ, Scott KM, Alleman TL, Mccormick RL. Engine performance of biodiesel fuel prepared from soybean soapstock: a high quality renewable fuel produced from a waste feedstock. Energy Fuel. 2001;15:1207–12.
Conceição MM, Candeia RA, Silva FC, Bezerra AF, Fernandes VJ Jr, Souza AG. Thermoanalytical characterization of castor oil biodiesel. Renew Sustain Energy Rev. 2007;11:964–75.
Dantas MB, Conceição MM, Fernandes VJ Jr, Santos NA, Rosenhaim R, Marques ALB, Santos IMG, Souza AG. Thermal and kinetic study of corn biodiesel obtained by the methanol and ethanol routes. J Therm Anal Calorim. 2007;87:835–9.
Domingos AK, Saad EB, Vechiatto WWD, Wilhelm HM, Ramos LP. The influence of BHA BHT and TBHQ on the oxidation stability of soybean oil ethyl esters (biodiesel). J Braz Chem Soc. 2007;18:416–23.
Candeia RA, Silva MCD, Carvalho Filho JR, Brasilino MGA, Bicudo TC, Santos IMG, Souza AG. Influence of soybean biodiesel content on basic properties of biodiesel–diesel blends. Fuel. 2009;88:738–43.
Jorge N, Gonçalves LAG. Behavior of high oleic sunflower oil heated under thermoxidation and frying conditions. Ciên Tecnol Aliment. 1998;18:335–42. (in Portuguese).
ANP—Brazilian National Agency of Petroleum, Natural Gas and Biofuels Resolution number 07 (March 19, 2008). DOU 20.03.2008.
Ramos MJ, Fernández CM, Casas A, Rodríguez L, Pérez A. Influence of fatty acid composition of raw materials on biodiesel properties. Bioresource Technol. 2009;100:261–8.
Sharma BK, Stipanovic AJ. Development of a new oxidation stability test method for lubricating oils using high-pressure differential scanning calorimetry. Thermochim Acta. 2003;402:1–18.
Rodrigues FMG, Souza AG, Santos IMG, Bicudo TC, Silva MCD, Sinfrônio FSM. Vasconcelos AFF antioxidative properties of hydrogenated cardanol for cotton biodiesel by P-DSC and UV/VIS. J Therm Anal Calorim. 2009;97:605–9.
Santos NA, Santos JRJ, Sinfrônio FSM, Bicudo TC, Santos IMG, Antoniosi Filho NR, Fernandes VJ Jr, Souza AG. Thermo-oxidative stability and cold flow properties of babassu biodiesel by P-DSC and TMDSC techniques. J Therm Anal Calorim. 2009;97:611–4.
López-Beceiro J, Artiaga R, Tarrıó-Saavedra J, Gracia C, Tarrío-Saavedra J, Naya S, Mier JL. Comparison of olive, corn, soybean and sunflower oils by P-DSC. J Therm Anal Calorim. 2010;. doi:10.1007/s10973-010-1165-2.
Ferrari RA, Souza WL. Evaluation of oxidation stability of sunflower oil biodiesel with antioxidants. Quim Nova. 2009;32:106–11. (in Portuguese).
Stavinoha LL, Kline KS. Report, Oxidation Stability of Methyl Soyates—Modified ASTM D 5304 and D 6186 for Biodiesel B100; Warren: U.S. Army, TACOM, TARDEC, National Automotive Center; 2001.
Shahidi F. Bailey’s industrial oil and fat products, vol. 6. 6th ed. Hoboken: Copyright John Wiley & Sons, Inc; 2005.
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The authors acknowledge the support of the Brazilian agencies Research and Projects Financing (FINEP) and National Council for Scientific and Technological Development (CNPq/MCT).
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Tavares, M.L.A., Queiroz, N., Santos, I.M.G. et al. Sunflower biodiesel. J Therm Anal Calorim 106, 575–579 (2011). https://doi.org/10.1007/s10973-011-1357-4
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DOI: https://doi.org/10.1007/s10973-011-1357-4