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Effects of water on the esterification of free fatty acids by acid catalysts
Park, Ji-Yeon; Wang, Zhong-Ming; Kim, Deog-Keun; Lee, Jin-Suk
2010-03
Source PublicationRENEWABLE ENERGY
ISSN0960-1481
Volume35Issue:3Pages:5,614-618
Contribution Rank[Park, Ji-Yeon; Kim, Deog-Keun; Lee, Jin-Suk] Korea Inst Energy Res, Taejon 305343, South Korea; [Wang, Zhong-Ming] Guangzhou Inst Energy Convers, Guangzhou 510640, Guangdong, Peoples R China
Corresponding Authorbmjslee@kier.re.kr
Other AbstractTo maximize the production of biodiesel from soybean soapstock, the effects of water on the esterification of high-FFA (free fatty acid) oils were investigated. Oleic acid and high acid acid oil (HAAO) were esterified by reaction with methanol in the presence of Amberlyst-15 as a heterogeneous catalyst or sulfuric acid as a homogeneous catalyst. The yield of fatty acid methyl ester (FAME) was studied at oil to methanol molar ratios of 1:3 and 1:6 and reaction temperatures of 60 and 80 degrees C. The rate of esterification of oleic acid significantly decreased as the initial water content increased to 20% of the oil. The activity of Amberlyst-15 decreased more rapidly than that of sulfuric acid, due to the direct poisoning of acid sites by water. Esterification using sulfuric acid was not affected by water until there was a 5% water addition at a 1:6 molar ratio of oil to methanol. FAME content of HAAO prepared from soapstock rapidly increased for the first 30 min of esterification. Following the 30-min mark, the rate of FAME production decreased significantly due to the accumulation of water. When methanol and Amberlyst-15 were removed from the HAAO after 30 min of esterification and fresh methanol and a catalyst were added, the time required to reach 85% FAME content was reduced from 6 h to 1.8 h. (C) 2009 Elsevier Ltd. All rights reserved.
KeywordSoapstock Esterification Water Production Amberlyst-15 Sulfuric Acid Response-surface Methodology Biodiesel Production Diesel Fuel High Ffa Oil Methanol Optimization
Subject AreaEnergy & Fuels
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Indexed BySCI ; EI
Language英语
Document Type期刊论文
Identifierhttp://ir.giec.ac.cn/handle/344007/8516
Collection中国科学院广州能源研究所
Recommended Citation
GB/T 7714
Park, Ji-Yeon,Wang, Zhong-Ming,Kim, Deog-Keun,et al. Effects of water on the esterification of free fatty acids by acid catalysts[J]. RENEWABLE ENERGY,2010,35(3):5,614-618.
APA Park, Ji-Yeon,Wang, Zhong-Ming,Kim, Deog-Keun,&Lee, Jin-Suk.(2010).Effects of water on the esterification of free fatty acids by acid catalysts.RENEWABLE ENERGY,35(3),5,614-618.
MLA Park, Ji-Yeon,et al."Effects of water on the esterification of free fatty acids by acid catalysts".RENEWABLE ENERGY 35.3(2010):5,614-618.
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