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E. F. S. M. Ramalho Departamento de Química, CCEN, LACOM, Universidade Federal da Paraíba, Campus I, João Pessoa, PB, 58059-900, Brasil

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I. M. G. Santos Departamento de Química, CCEN, LACOM, Universidade Federal da Paraíba, Campus I, João Pessoa, PB, 58059-900, Brasil

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A. S. Maia Departamento de Química, CCEN, LACOM, Universidade Federal da Paraíba, Campus I, João Pessoa, PB, 58059-900, Brasil

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A. L. Souza Departamento de Química, CCEN, LACOM, Universidade Federal da Paraíba, Campus I, João Pessoa, PB, 58059-900, Brasil

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A. G. Souza Departamento de Química, CCEN, LACOM, Universidade Federal da Paraíba, Campus I, João Pessoa, PB, 58059-900, Brasil

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Abstract

Chemical composition of oils and fats used in the biodiesel synthesis can influence in processing and storage conditions, due to the presence of unsaturated fatty acids. An important point is the study of the biodiesel thermal stability to evaluate its quality using thermal analysis methods. In this study the thermal stabilities of the poultry fat and of their ethyl (BEF) and methyl (BMF) biodiesels were determined with the use of thermogravimetry (TG/DTG), differential thermal analysis (DTA) and differential scanning calorimetry (DSC), in different atmospheres. The TG/DTG curves of the poultry fat in synthetic air presented three decomposition steps while only one step was observed in nitrogen (N2) atmosphere. The DSC results indicated four exothermic enthalpic transitions in synthetic air and an endothermic transitions in N2 atmosphere attributed to the combustion process and to the volatilization and/or decomposition of the fatty acids, respectively. For both biodiesels the TG/DTG curves in air indicated two mass loss steps. In the DSC curves four exothermic transitions were observed in synthetic air besides an endothermic one in N2 atmosphere.

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
1
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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