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Abstract
This study is intended to consider aspects related to the feasibility of the production of biodiesel from waste/recycled oils in an attempt to help reduce the cost of biodiesel and reduce waste and pollution coming from the waste oil. The production of biodiesel fuel from a waste frying oil transesterification process was used with an alkali catalyst (NaOH). The transesterification process was made with four alcohol types with a molar ratio of 6:1 alcohol to oil at temperature 60°C and different reaction times (1 h and 3 h). The methyl ester products were then analyzed according to the standard methods of analysis (ASTM and IP) and evaluated according to their fuel properties as compared to diesel fuel. In addition, to improve the performance of the methyl ester, it was blended with diesel oil at different ratios (10, 15, and 20), then the oxidation stability of the products was carried out with and without antioxidant additive.