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Bioresour Technol. 2008 Apr;99(6):1716-21. Epub 2007 May 24.

Biodiesel production from crude Jatropha curcas L. seed oil with a high content of free fatty acids.

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  • 1Energy Technology Center, Agency for Assessment and Application of Technology, Kawasan Puspiptek, Serpong, Tangerang, Indonesia.


A technique to produce biodiesel from crude Jatropha curcas seed oil (CJCO) having high free fatty acids (15%FFA) has been developed. The high FFA level of JCJO was reduced to less than 1% by a two-step pretreatment process. The first step was carried out with 0.60 w/w methanol-to-oil ratio in the presence of 1% w/w H(2)SO(4) as an acid catalyst in 1-h reaction at 50 degrees C. After the reaction, the mixture was allowed to settle for 2h and the methanol-water mixture separated at the top layer was removed. The second step was transesterified using 0.24 w/w methanol to oil and 1.4% w/w NaOH to oil as alkaline catalyst to produce biodiesel at 65 degrees C. The final yield for methyl esters of fatty acids was achieved ca. 90% in 2 h.

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