Removal of Naphthenic Acids from a Diesel Fuel by Esterification

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• 作者：Yanzhen Z. Wang ; * ; Xueying Y. Sun ; Yanping P. Liu ; Chenguang G. Liu
• 刊名：Energy & Fuels
• 出版年：2007
• 出版时间：March 2007
• 年：2007
• 卷：21
• 期：2
• 页码：941 - 943
• 全文大小：69K
• 年卷期：v.21,no.2(March 2007)
• ISSN：1520-5029

文摘

The presence of relatively high levels of naphthenic acids in diesel fuels has great influence on petroleumrefiners. In this paper, a new method of catalytic esterification was introduced to remove the naphthenic acidsfrom a diesel fuel. The paper used SnO/Al₂O₃ as the catalyst system, and a fixed bed catalyst was made. Theexperiments were finished in a fixed bed reactor. The total acid number of the diesel fuel was lowered from1.7 mg KOH/g to less than 0.1 mg of KOH/g at a methanol/oil ratio of 0.010. This method can attain theeffectiveness of aqueous base washing and has no loss of oil. Data indicates that the acid removal is influencedby the reaction temperature, methanol/oil ratio, and space velocity. A high reaction temperature and methanol/oil ratio or low space velocity are favorable for the esterification. The color of the de-acided oils can apparentlybe improved during the esterification. The optimum reaction temperature is 280 C.