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Journal of Thermal Analysis and Calorimetry

, Volume 113, Issue 2, pp 437–442 | Cite as

Analysis of thermal and oxidative stability of biodiesel from Jatropha curcas L. and beef tallow

  • Erisandro S. Silva
  • Marta M. Conceição
  • Eduardo H. S. Cavalcanti
  • Valter J. FernandesJr.
  • Ana C. D. Medeiros
  • Antonio G. Souza
Article

Abstract

The oxidation of oils and biodiesels occurs due to several factors: the quantity of double bonds and the presence of allylic and bis-allylic hydrogens. Esters (biodiesel) that have large amounts of unsaturated fatty acids are more susceptible to oxidation than saturated. The aim of this work was to analyze the thermal and oxidative stability of ethyl biodiesel from Jatropha curcas L. and beef tallow by thermogravimetric, pressure differential scanning calorimetry, and PetroOxy methods. The samples of biodiesel from beef tallow present higher oxidation stability compared to biodiesel from J. curcas. In relation to calorimetric curves of biodiesel from J. curcas and beef tallow stored by 60 days without and with antioxidant, there was verified displacement of peak temperature of the transition to higher temperatures, respectively. Just a sample of biodiesel from beef tallow stored for 60 days with 3,000 ppm of antioxidant t-butyl-hydroxyquinone was within the standard established by Brazilian National Agency of Petroleum, Natural Gas, and Biofuels (ANP). The biodiesel from beef tallow was more stable in terms of thermal and oxidative stability than biodiesel from J. curcas. The thermal and oxidative stability of biodiesel depends on its chemical structure; this corroborates the fact that the oils with a predominance of saturated fatty acids are more stable than the unsaturated.

Keywords

Thermal and oxidative stability Jatropha curcas Beef tallow PDSC PetroOxy 

Notes

Acknowledgements

The authors thank CNPq for the financial support.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2012

Authors and Affiliations

  • Erisandro S. Silva
    • 1
  • Marta M. Conceição
    • 1
  • Eduardo H. S. Cavalcanti
    • 2
  • Valter J. FernandesJr.
    • 3
  • Ana C. D. Medeiros
    • 4
  • Antonio G. Souza
    • 5
  1. 1.Universidade Federal de Campina Grande, CES, Campus de CuitéCuitéBrazil
  2. 2.Instituto Nacional de TecnologiaRio de JaneiroBrazil
  3. 3.Universidade Federal do Rio Grande do NorteNatalBrazil
  4. 4.Universidade Estadual da ParaíbaCampina GrandeBrazil
  5. 5.Universidade Federal da ParaíbaJoão PessoaBrazil

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