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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 of the ending of this project. 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. 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.
Then, investigation Jatropha oil storage times are 2 samples, A and B. They were bought from 2 companies. They are kept in plastic tank and zincs tank. The storage times are 0, 1, 3, 6, 9, 12, 15, 18, 21, 24 months respectively. When the storage time is duration, they are took sample A and B to analyze acid value, water content and oxidation stability.
The analysis result of sample A which is kept in plastic and zinc tank on 0 month. It is found that acid value is 2.34 mg of potassium/ gm. oil and oxidation stability is 12 hrs. Sample B is kept in plastic and zincs tank on 0 month. It was found that acid value is 5.85 mg of potassium/ gm. oil and oxidation stability is 7.68 hrs. However, the same values of water contents are 0.09 %. After that, the storage times past 24 months. The analysis result of sample A and B are kept in plastic and zinc tank found that the sample A, acid value is increase and percents of increase are 33.70 and 35.0., the oxidation stability is decrease and percents of decrease are 35 and 40.67. Anyway, the water contents are same increasing percent, 11.11. The sample B, acid value is increase and percents of increase are 31.28 and 33.33., the oxidation stability is decrease and percents of decrease are 23.83 and 30.34. Anyway, the water contents are same percent increase, 11.11.
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