Influence of synthetic antioxidants on the oxidation stability of biodiesel produced from acid raw Jatropha curcas oil

Supriyono, .supriyono and Hary, Sulistyo and Manuel, Almeida and Joana M., Dias (2915) Influence of synthetic antioxidants on the oxidation stability of biodiesel produced from acid raw Jatropha curcas oil. Fuel Processing Technology, 132. pp. 133-138. ISSN ISSN: 0378-3820.

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Abstract

In the present work, Jatropha curcas biodiesel was produced from a high free fatty acid raw oil (AV = 35.36 mg KOH g− 1) containing 76.5% w/w of unsaturated fatty acids. The production route consisted of a two-step method, using acid esterification, followed by conventional alkali methanolysis. Biodiesel was characterized in agreement with EN 14214:2014 and a study on the use of 4 synthetic antioxidants was conducted. The high free fatty acid content of the oil could be reduced to 0.8% w/w by acid esterification. A good product quality was generally ob- served but the very low oxidation stability, corresponding to an induction period (IP) of 1.37 h, was the highest concern. Statistically significant predictive models, which related each antioxidant concentration with the IP, were obtained. Pyrogallol (PY) showed the best results, being estimated that the use of 204 ppm in biodiesel could increase its IP to the limit imposed by the quality standard (8 h). The following rank, in terms of effective- ness, was obtained: PY N propyl gallate (PG) N butylated hydroxytoluene (BHT) N tert-butyl hydroquinone (TBHQ). In agreement, the stabilization factors (F), considering the use of 204 ppm of antioxidant, were: 5.84 for PY, 4.06 for PG, 1.85 for BHT and 0.85 for TBHQ.

Item Type: Article
Subjects: T Technology > TP Chemical technology
Depositing User: supriyono .
Date Deposited: 19 Sep 2024 07:39
Last Modified: 19 Sep 2024 07:39
URI: http://repo.setiabudi.ac.id/id/eprint/6313

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