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Received January 22, 2007
Accepted April 6, 2007
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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
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Novel biodiesel production technology from soybean soapstock
1Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, 2, Nengyuan, Wushan, Tianhe, Guangzhou, 510640, China 2Graduate University of Chinese Academy of Sciences, 19, Yunquan, Shijingshan, Beijing, 100049, China 3Korea Institute of Energy Research, 71-2, Jang-dong, Yuseong-gu, Daejeon 305-343, Korea
bmjslee@kier.re.kr
Korean Journal of Chemical Engineering, November 2007, 24(6), 1027-1030(4), 10.1007/s11814-007-0115-6
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Abstract
his paper describes an attractive method to make biodiesel from soybean soapstock (SS). A novel recovery technology of acid oil (AO) from SS has been developed with only sulfuric acid solution under the ambient temperature (25±2 ℃). After drying, AO contained 50.0% FFA, 15.5% TAG, 6.9% DAG, 3.1% MAG, 0.8% water and other inert materials. The recovery yield of AO was about 97% (w/w) based on the total fatty acids of the SS. The acid oil could be directly converted into biodiesel at 95 ℃ in a pressurized reactor within 5 hours. Optimal esterification conditions were determined to be a weight ratio of 1 : 1.5 : 0.1 of AO/methanol/sulfuric acid. Higher reaction temperature helps to shorten the reaction time and requires less catalyst and methanol. Ester content of the biodiesel derived from AO through one-step acid catalyzed reaction is around 92%. After distillation, the purity of the biodiesel produced from AO is 97.6% which meets the Biodiesel Specification of Korea. The yield of purified biodiesel was 94% (w/w) based on the total fatty acids of the soapstock.
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