Abstract
The aim of this investigation is to characterize Jatropha curcas seeds and to study the influence of seeds storage time on the extracted oil quality. The characterization process is done according to the French standards and the DIN standards are utilized as a basis for the extracted oil analysis as engine fuel. Two extraction methods are utilized, the solvent and the mechanical extractions. The maximum oil content, 40.42% is obtained from seeds having one year storage time and minimum water content of 4.48%. The oil acidity is also largely influenced by the same parameters. As a matter of fact, higher acidity percentage, 2.83% is obtained from seeds having respectively two years storage time and 7.15% water content whereas, the smaller percentage, 1.13%. is obtained with seeds of one year storage time and the same water content. The investigation has also shown that the oil content is function of the seeds origin. The maximum oil extraction rate (81.4%) is obtained with a specific mechanical energy consumption of 70 Wh/kg.
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