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Received August 2, 2007
Accepted October 29, 2007
- This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Optimization of biodiesel production from trap grease via acid catalysis
1Guangzhou Institute of Energy Conversion, CAS, China 2Graduate University of Chinese Academy of Sciences, 19, Yunquan, Shijingshan, Beijing, 100049, China 3Korea Institute of Energy Research, Daejeon 305-343, Korea
bmjslee@kier.re.kr
Korean Journal of Chemical Engineering, July 2008, 25(4), 670-674(5), 10.1007/s11814-008-0110-6
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Abstract
As a kind of waste collected from restaurants, trap grease is a chemically challenging feedstock for biodiesel production for its high free fatty acid (FFA) content. A central composite design was used to evaluate the effect of methanol quantity, acid concentration and reaction time on the synthesis of biodiesel from the trap grease with 50% free fatty acid, while the reaction temperature was selected at 95 oC. Using response surface methodology, a quadratic polynomial equation was obtained for ester content by multiple regression analysis. Verification experiments confirmed the validity of the predicted model. To achieve the highest ester content of crude biodiesel (89.67%), the critical values of the three variables were 35.00 (methanol-to-oil molar ratio), 11.27 wt% (catalyst concentration based on trap grease) and 4.59 h (reaction time). The crude biodiesel could be purified by a second distillation to meet the requirement of biodiesel specification of Korea.
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