Main Article Content
The extraction of Jatropha oil from Jatropha seed could be done by three typical methods namely, Soxhlet Extraction, Hydraulic Press, and Screw Press. Each method provided Jatropha oil with different quantity and property. Soxhlet extraction and hydraulic press provided highest and lowest quantity of Jatropha oil respectively. Jatropha oil extracted by the screw press was found to have the best chemical and physical properties with medium quantity.
The study of storage time for both Jatropha seed and (extracted) oil were conducted in parallel. The storage durations for the seed were 0th, 1st, 3rd, 6th, 10th, 12th, 15th, 18th month. This Jatropha seed was extracted by screw press and storage time for the extracted oil was 24 months except extracted oil from seed at 15th, 18th month which storage time of extracted oil was 9 months because this project was finished. Consequently, certain amount of Jatropha seed at month 0th was sampled and extracted, then properties of extracted oil, i.e. water content, acid value and oxidation stability, were analyzed and recorded. Jatropha oil from seeds those stored durations reached the 0th, 1st , 3rd, 6th, 9th, 12th, 15th and 18th month were sampled, extracted analyzed and recorded.
The results in the analysis indicates that water content, acid value and oxidation stability, of oil extracted from seed at month 0th were 0.07 % (wt.), 1.31 mg of Potassium/ gm oil, 13.9 hours respectively. Water content and acid value of Jatropha oil extracted from seed at month 18th were 14.29 and 129.77 % higher than those extracted from seed at month 0th, but the oxidation stability was 39.21 lower than oil extracted from seed at month 0th.
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