Journal of Thermal Analysis and Calorimetry

, Volume 117, Issue 3, pp 1357–1363 | Cite as

Thermal evaluation of heavy crude oil by simultaneous TG-DSC-FTIR: Part 2

  • Michelle G. Mothé
  • Cheila G. Mothé
  • Carlos H. M. Carvalho
  • Marcia C. Khalil de Oliveira


In this work a continuous investigation of the thermal behavior of two heavy crude oils, P2 and P4, from Brazilian basin was performed using simultaneous technique TG-DSC-FTIR. In previous publication—Part 1, about these same oils at nitrogen atmosphere, it was identified for P2 sample that the main evolved component was 1-dodecyl-4-octyl-cyclohexane at 450 °C and for P4 sample the main component was evolved at 340 °C referent to 1-methyl cyclohexene. The simultaneous technique TG/FTIR was also performed for the present study in synthetic air atmosphere and was more elucidative than analysis in nitrogen atmosphere. For heavy oil P2, there was identified the presence of carbon dioxide, carbon monoxide and 4-methylcyclohexanone at 382 °C. Whilst for sample P4 the gaseous components evolved at 454 °C were carbon dioxide, carbon monoxide and 1-methylcyclohexene. Also differences in TG analysis for both samples were observed regarding the number of components. In air atmosphere crude oil P2 exhibited three decomposition stages, in nitrogen were only two. Four stages were exhibited on the thermogravimetric curve for oil P4 in synthetic air, while in nitrogen atmosphere there were three stages. Thus, this study has a unique character regarding the use of combined simultaneous techniques as STA/FTIR to identify components in heavy oil which may contribute to upgrade methods referring to crude oil composition.


Heavy crude oil Thermal analysis Simultaneous TG-DSC-FTIR 



The authors would like to thank Petrobras and the Brazilian Council for Scientific and Technological Development (CNPq) for their financial support and NETZSCH - Geratebau GmbH Applications Laboratory.


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2014

Authors and Affiliations

  • Michelle G. Mothé
    • 1
  • Cheila G. Mothé
    • 1
  • Carlos H. M. Carvalho
    • 2
  • Marcia C. Khalil de Oliveira
    • 2
  1. 1.School of ChemistryFederal University of Rio de JaneiroRio de JaneiroBrazil
  2. 2.Petrobras R&D Center - CENPESRio de JaneiroBrazil

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