Evaluation of Biodiesel Oxidative Stability by Condutimetric Measurements

Authors

  • Aline Rayboltt C. Souza  Dep. de Físico-Química, Instituto de Química, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
  • Natalia V. Lintz  Dep. de Físico-Química, Instituto de Química, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
  • Cynthia F. Scofield  Dep. de Físico-Química, Instituto de Química, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
  • Lucia R. Raddi de Araujo  Dep. de Físico-Química, Instituto de Química, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brasil

Keywords:

Biodiesel, Oxidative Stability, Rapeseed, Sunflower and Soybean

Abstract

The biodiesel stability is an issue of great interest in whole world. In the present study, the oxidative resistances of biodiesel samples, originating from three fatty raw materials, are compared. Biodiesel samples were obtained from ethylic and methylic transesterification, at 70ºC, using refined sunflower, soybean and rapeseed oils and KOH as the catalytic agent. These samples were subjected to an accelerated oxidation test at 110ºC, under air flow. The produced gases were collected in a container with an electrode immersed in distilled water for electric conductivity measurements. For all the samples, it was observed the electric conductivity increases with time as an indicative of the formation of oxidative products such as alcohols, formic acid or smaller fatty acids. The samples stability decreased with increasing air flow. Comparatively, ethylic biodiesel samples seemed to be a little more resistant to degradation process in comparison to methylic biodiesel. Among all the samples, biodiesel obtained from rapeseed oil was more resistant to oxidative degradation, which is in accordance with the least content of C18:2 fatty acids in the respective raw material structure.

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International Journal of Scientific Research in Science and Technology

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Published

2016-10-30

Issue

Volume 2, Issue 5, September-October-2016

Section

Research Articles

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How to Cite

[1]
Aline Rayboltt C. Souza, Natalia V. Lintz, Cynthia F. Scofield, Lucia R. Raddi de Araujo "Evaluation of Biodiesel Oxidative Stability by Condutimetric Measurements" International Journal of Scientific Research in Science and Technology(IJSRST), Online ISSN : 2395-602X, Print ISSN : 2395-6011,Volume 2, Issue 5, pp.68-72, September-October-2016.