Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 97: Issue 2
Antioxidative properties of hydrogenated cardanol for cotton biodiesel by PDSC and UV/VIS
Authors:
M. Rodrigues F Coordenação de Química, CCN, Universidade Estadual do Piauí, Pirajá, CEP 64002-150 Teresina, Piauí Brazil

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A. Souza Departamento de Química, CCEN, Universidade Federal da Paraíba, 58059-900 João Pessoa, Paraíba Brazil

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I. Santos Departamento de Química, CCEN, Universidade Federal da Paraíba, 58059-900 João Pessoa, Paraíba Brazil

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T. Bicudo Departamento de Química, CCEN, Universidade Federal da Paraíba, 58059-900 João Pessoa, Paraíba Brazil

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M. Silva Departamento de Química, CCEN, Universidade Federal da Paraíba, 58059-900 João Pessoa, Paraíba Brazil

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F. Sinfrônio Centro de Formação de Professores, Universidade Federal de Campina Grande (UFCG), CEP 58900-000 Cajazeiras, Paraíba Brazil

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A. Vasconselos Departamento de Química e Biologia, Universidade Estadual do Maranhão, 65055-150 São Luis, Brazil

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Pages:
605–609
Online Publication Date:
28 Apr 2009
Publication Date:
01 Aug 2009
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-008-9600-3
Keywords:
biodiesel; PDSC; UV/Vis
Restricted access

Abstract  

Biodiesel is a non-toxic biodegradable fuel that consists of alkyl esters produced from renewable sources, vegetal oils and animal fats, and low molecular mass alcohols, and it is a potential substitute for petroleum-derived diesel. Depending on the raw materials used, the amount of unsaturated fatty acids can vary in the biodiesel composition. Those substances are widely susceptible to oxidation processes, yielding polymeric compounds, which are harmful to the engines. Based on such difficulty, this work aims to evaluate the antioxidant activity of cashew nut shell liquid (cardanol), as additive for cotton biodiesel. The oxidative stability was investigated by the pressure differential scanning calorimetry (PDSC) and UV/Vis spectrophotometer techniques. The evaluated samples were: as-synthesized biodiesel — Bio T0, additivated and heated biodiesel — Bio A (800 ppm L−1 of hydrogenated cardanol, 150°C for 1 h), and a heated biodiesel — Bio B (150°C, 1 h). The oxidative induction time (OIT) analyses were carried out employing the constant volume operation mode (203 psi oxygen) at isothermal temperatures of 80, 85, 90, 100°C. The high pressure OIT (HPOIT) were: 7.6, 15.7, 22.7, 64.6, 124.0 min for Bio T0; 41.5, 77.0, 98.6, 106.6, 171.9 min for Bio A and 1.7, 8.2, 14.8, 28.3, 56.3 min for Bio B. The activation energy (E) values for oxidative processes were 150.0±1.6 (Bio T0), 583.8±1.5 (Bio A) and 140.6±0.1 kJ mol−1(Bio B). For all samples, the intensities of the band around 230 nm were proportional to the inverse of E, indicating small formation of hyper conjugated compounds. As observed, cardanol has improved approximately four times the cotton biodiesel oxidative stability, even after the heating process.

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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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