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  • 1 Universidade Federal da Paraíba Departamento de Química, CCEN Campus I Joao Pessoa PB 58059-900 Brazil
  • | 2 Universidade Estadual do Maranhão Departamento de Química e Biologia, CECEN Sao Luis MA Brazil
  • | 3 Universidade Estadual do Piauí Coordenação de Química, CCEN Teresina PI Brazil
  • | 4 Instituto Nacional de Tecnologia Laboratório de Corrosão e Proteção, DCD 20081-312 Rio de Janeiro RJ Brazil
  • | 5 Universidade Federal de Goiás Departamento de Química Goiania GO Brazil
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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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