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Journal of Thermal Analysis and Calorimetry
Authors: M. Dantas, A. Almeida, Marta Conceição, V. Fernandes Jr, Iêda Santos, F. Silva, L. Soledade, and A. Souza

Abstract  

This work presents the characterization and the kinetic compensation effect of corn biodiesel obtained by the methanol and ethanol routes. The biodiesel was characterized by physico-chemical analyses, gas chromatography, nuclear magnetic resonance and thermal analysis. The physico-chemical properties indicated that the biodiesel samples meet the specifications of the Brazilian National Agency of Petroleum, Natural Gas and Biofuels (ANP) standards. The analyses by IR and 1H NMR spectroscopy indicated the ester formation. Gas chromatography indicated that biodiesel was obtained with an ester content above 97%. The kinetic parameters were determined with three different heating rates, and it was observed that both the methanol and ethanol biodiesel obeyed the kinetic compensation effect.

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Journal of Thermal Analysis and Calorimetry
Authors: M. Dantas, Marta Conceição, V. Fernandes Jr, Nataly Santos, R. Rosenhaim, Aldalea Marques, Iêda Santos, and A. Souza

Abstract  

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.

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Journal of Thermal Analysis and Calorimetry
Authors: A. Vasconcelos, M. Dantas, M. Filho, R. Rosenhaim, E. Cavalcanti, N. Antoniosi Filho, F. Sinfrônio, I. Santos, and A. Souza

Abstract  

The influence of drying processes in the biodiesel oxidation was investigated by means of the oxidative induction time obtained from differential scanning calorimetry data. For this purpose, corn biodiesel was dried by different methods including: chemical (anhydrous sodium sulfate) and thermal (induction heating, heating under vacuum and with microwave irradiation). The drying efficiency was evaluated by monitoring IR absorption in the 3,500–3,200 cm−1 range and by the AOCS Bc 2-49 method. In general, the oxidative induction times increased inversely to the heating degree, except that of microwave irradiation, which was selective to water evaporation and caused low impact over the unsaturation of biodiesel. The DSC technique was shown to be a powerful tool to evaluate with high level of differentiation the influence of the drying process on the oxidative stability of biodiesel.

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Biodiesel from soybean oil, castor oil and their blends

Oxidative stability by PDSC and rancimat

Journal of Thermal Analysis and Calorimetry
Authors: M. B. Dantas, A. R. Albuquerque, L. E. B. Soledade, N. Queiroz, A. S. Maia, I. M. G. Santos, A. L. Souza, E. H. S. Cavalcanti, A. K. Barro, and A. G. Souza

, Cavalcanti , EHS , Antoniosi Filho , NR , Sinfrônio , FSM , Santos , IMG , Souza , AG . Influence of drying processes on oxidative stability of ethyl corn biodiesel by differential scanning calorimetry . J Therm Anal Calorim . 2009 ; 97 : 2 657

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Journal of Thermal Analysis and Calorimetry
Authors: E. F. S. M. Ramalho, A. R. Albuquerque, A. L. Souza, A. K. Barro, A. S. Maia, I. M. G. Santos, and A. G. Souza

, Filho , MGR , Rosenhaim , R , Cavalcanti , EHS , Antoniosi Filho , NR , Sinfrônio , FSM , Santos , IMG , Souza , AG . Influence of drying processes on oxidative stability of ethyl corn biodiesel by differential scanning calorimetry . J

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Journal of Thermal Analysis and Calorimetry
Authors: Luzia Patricia Fernandes Carvalho Galvão, Anne Gabriella Dias Santos, Amanda Duarte Gondim, Marcela Nascimento Barbosa, Antonio Souza Araujo, Luiz Di Souza, and Valter José Fernandes Junior

Thermal and kinetic study of corn biodiesel obtained by the methanol and ethanol routes . J Therm Anal Calorim . 10.1007/s10973-006-7780-2 . 2. Meher , LC , Sagar , DV . 2006 Technical

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Journal of Thermal Analysis and Calorimetry
Authors: Romulo D. A. Andrade, Elaine A. Faria, Amaury M. Silva, Wandallas C. Araujo, Gustavo C. Jaime, Kenia P. Costa, and Alexandre G. S. Prado

, FSM , Santos , IMG , Souza , AG . Influence of drying processes on oxidative stability of ethyl corn biodiesel by differential scanning calorimetry . J Therm Anal Calorim . 2009 ; 97 : 657 – 660 . 10.1007/s10973

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Sunflower biodiesel

Use of P-DSC in the evaluation of antioxidant efficiency

Journal of Thermal Analysis and Calorimetry
Authors: M. L. A. Tavares, N. Queiroz, I. M. G. Santos, A. L. Souza, E. H. S. Cavalcanti, A. K. D. Barros, R. Rosenhaim, L. E. B. Soledade, and A. G. Souza

study of corn biodiesel obtained by the methanol and ethanol routes . J Therm Anal Calorim . 2007 ; 87 : 835 – 839 . 10.1007/s10973-006-7780-2 . 5. Domingos , AK , Saad , EB

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Santos , NA et al. 2007 Thermal and kinetic study of corn biodiesel obtained by the methanol and ethanol routes . J Therm Anal Calorim 87 3 835 – 839 10.1007/s10973-006-7780-2 . 25. Kök

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Journal of Thermal Analysis and Calorimetry
Authors: Eveline De Robertis, Gabriela F. Moreira, Raigna A. Silva, and Carlos A. Achete

stability of corn biodiesel . Fuel . 2011 ; 90 : 773 – 778 . 10.1016/j.fuel.2010.09.014 . 18. Schneider , C , Porter , NA , Brash , AR . Routes to 4-hydroxynonenal: fundamental issues

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