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The Optimization of Biodiesel Production from Waste Frying Sunflower Oil Using a Heterogeneous Catalyst

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This study was performed to optimize a base heterogeneous CaO catalyzed transesterification process for biodiesel production from waste frying sunflower oil. Response surface methodology based on central composite face centered design was employed to statistically evaluate and optimize the conditions for maximum production of biodiesel and study the significance and interaction of methanol to oil (M:O) molar ratio, catalyst concentration and reaction time on biodiesel yield. A quadratic model equation was obtained for biodiesel production and the validity of the predicted model was confirmed. The optimum combination for transesterification was determined to be 7.05:1 M:O, 8.21 CaO wt% and 1.5 h at 60°C, and mixing rate of 300 rpm. The maximum predicted and actual biodiesel yield was 92.2 and 93%, respectively. The reusability of used CaO was investigated and recorded sufficient biodiesel production up to four cycles. The fuel properties of the produced biodiesel were measured and compared with those of Egyptian petro-diesel and international biodiesel standards. Acceptable agreement was observed, encouraging application of biodiesel as an alternative or complementary to petro-diesel.
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Keywords: biodiesel; heterogeneous CaO catalyst; optimization; transesterification; waste frying sunflower oil

Document Type: Research Article

Affiliations: 1: Egyptian Petroleum Research Institute, Nasr City, Cairo, Egypt 2: School of Civil Engineering, Universiti Sains Malaysia, Nibong Tebal, Penang, Malaysia

Publication date: August 3, 2014

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