Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 106: Issue 2
Sunflower biodiesel
Use of P-DSC in the evaluation of antioxidant efficiency
Authors:
M. L. A. Tavares Departamento de Química, CCEN, Universidade Federal da Paraíba, Laboratório de Combustíveis e Materiais, João Pessoa, PB, Brazil

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N. Queiroz Departamento de Química, CCEN, Universidade Federal da Paraíba, Laboratório de Combustíveis e Materiais, João Pessoa, PB, Brazil

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I. M. G. Santos Departamento de Química, CCEN, Universidade Federal da Paraíba, Laboratório de Combustíveis e Materiais, João Pessoa, PB, Brazil

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A. L. Souza Departamento de Química, CCEN, Universidade Federal da Paraíba, Laboratório de Combustíveis e Materiais, João Pessoa, PB, Brazil

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E. H. S. Cavalcanti Divisão de Corrosão e Degradação, Instituto Nacional de Tecnologia, Rio de Janeiro, RJ, Brazil

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A. K. D. Barros Universidade Federal do Maranhão, São Luiz, MA. ANP—Agência Nacional do Petróleo, Gás Natural e Biocombustíveis, Av. Rio Branco, 65/21, Andar-Rio de Janeiro, RJ, 20090-004, Brazil

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R. Rosenhaim Departamento de Química, CCEN, Universidade Federal da Paraíba, Laboratório de Combustíveis e Materiais, João Pessoa, PB, Brazil

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L. E. B. Soledade Departamento de Química, CCEN, Universidade Federal da Paraíba, Laboratório de Combustíveis e Materiais, João Pessoa, PB, Brazil

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A. G. Souza Departamento de Química, CCEN, Universidade Federal da Paraíba, Laboratório de Combustíveis e Materiais, João Pessoa, PB, Brazil

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Pages:
575–579
Online Publication Date:
16 Feb 2011
Publication Date:
01 Nov 2011
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-011-1357-4
Keywords:
Biodiesel; Sunflower oil; Thermo-oxidative stability; Antioxidants
Restricted access

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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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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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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