Jatropha curcas is one of promising raw materials for biodiesel in the world particularly in Aceh, Indonesia. In this study, Jatropha curcas oil was extracted from fruits to produce methyl ester via the trans-esterification of Jatropha curcas oil by using KOH catalyst. The performance of KOH catalyst was verified by conducting the kinetics experiments at the atmospheric pressure with molar ratio of 1:12, 1:14 and 1:16 of the oil to methanol, the reaction temperature in the range of 30-60 o C, and with the catalyst in the range of 0.75-1.5 % (weight). The effect of operating parameters was investigated. The result showed that the optimum oil (methyl ester) yield was achieved for the molar ratio of 1:16, with the catalyst concentration of 1.5%. The rate constant of transesterification increased with the increase in the reaction temperature. Using the Arrhenius equation, the activation energy, Ea = 28.8 kJ moL-1 was obtained at the reaction temperature of 60 o C. The biodiesel produced was fairly met with the ASTM, where in the density (at 15 o C gr/ml), flash point, kinematic viscosity (at 40 o C) and cetane index were 0.99, 190 o F, 5.30 and 49, respectively
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