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A biodiesel production plant using waste frying oil was studied in a step of transesterification. The free fatty acid value of the studied waste cooking oil was not more than 2%. The crude biodiesel was produced from the transesterification, catalyzed with KOH. The results indicate that the optimum conditions for more 90% biodiesel conversion, is a catalyst amount of 1.2% (w), an oil to methanol ratio of 1:6, 60°C reaction temperature, 30 minutes reaction time, and 600 rpm stirring rate. Furthermore, the optimum conditions can scale up for biodiesel production in a purification process with commercial ion exchange resin packed in a column of the plant, instead of a water washing process. Hence, the used resin prevented generating wastewater from the biodiesel production. The optimum conditions of biodiesel flow rate in a fixed bed was studied. The results of the optimum reaction and the washing process can be applied for environmental friendly biodiesel plants.
Keywords: Biodiesel, Waste cooking oil, Ion exchange resin, Purification,Catalyst