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http://dx.doi.org/10.14478/ace.2018.1083

Preparation of Waste Cooking Oil-based Biodiesel Using Microwave Energy: Optimization by Box-Behnken Design Model  

Lee, Seung Bum (Department of Chemical Engineering, Dankook University)
Jang, Hyun Sik (Department of Chemical Engineering, Dankook University)
Yoo, Bong-Ho (College of Engineering, Dankook University)
Publication Information
Applied Chemistry for Engineering / v.29, no.6, 2018 , pp. 746-752 More about this Journal
Abstract
In this study, an optimized process for the waste cooking oil based biodiesel production using microwave energy was designed by using Box-Behnken design model. The process variables were chosen as a mole ratio of the methanol to oil, microwave power, and reaction time. Fatty acid methyl ester (FAME) content was then measured. Through the results of basic experiments, the range of optimum operation variables for the Box-Behnken design model, such as the methanol/oil mole ratio and reaction time, were set as between 8 to 10 and between 4 to 6 min, respectively. Ranges of the microwave power were set as from 8 to 12 W/g for 1.30 mg of KOH/g, acid value, while from 10 to 14 W/g for 2.00 mg of KOH/g, acid value. The optimum methanol/oil mole ratio, microwave power, and reaction time were reduced to 7.58, 10.26 W/g, and 5.1 min, respectively, for 1.30 mg KOH/g of acid value. Also, the optimum methanol/oil mole ratio, microwave power, and reaction time were 7.78, 12.18 W/g, and 5.1 min, respectively, for 2.00 mg KOH/g of acid value. Predicted FAME contents were 98.4% and 96.3%, with error rates of less than 0.3%. Therefore, when the optimized process of biodiesel production using microwave energy was applied to the Box-Behnken design model, the low error rate could be obtained.
Keywords
biodiesel; microwave; Box-Behnken design model; waste cooking oil; FAME content;
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