Amethod for synthesizing biodiesel comprising the steps of extracting oil form ground rubber seeds using a solvent extraction method; blending the extracted rubber seed oil with crude palm oil, wherein said extracted rubber seed oil is blended with the crude palm oil in a volumetric ratio range of 3-7:10;; esterifying the oil blend with an alcohol catalyzed by and acid, wherein the oil blend is reacted with the alcohol in a molar ratio range of 1:10-20, wherein the acid is applied in an amount of 0. 5wt% to 2.0wt%; and transesterifying the esterified oil blend with the alcohol catalyzed by a base to acquire the biodiesel, wherein the esterified oil blend is reacted with the alcohol in a molar ratio range of 1:6-10, wherein the base is applied in an amount of 0.5wt% to 2.0wt%.
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