A Comparative Study of Vegetable Oils for Biodiesel Production in Spain

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• 作者：Gemma Vicente ; Mercedes Martí ; nez ; and José ; Aracil
• 刊名：Energy & Fuels
• 出版年：2006
• 出版时间：January 2006
• 年：2006
• 卷：20
• 期：1
• 页码：394 - 398
• 全文大小：63K
• 年卷期：v.20,no.1(January 2006)
• ISSN：1520-5029

文摘

In recent years, the acceptance of fatty acid methyl esters (biodiesel) as an alternative fuel has rapidlygrown in Spain. The raw materials to produce biodiesel in this country include traditional seed oils (sunflowerand rapeseed), alternative seed oils (Brassica carinata), genetically modified vegetable oils (high oleicsunflower), and used frying oils. In this study, the above vegetable oils with free fatty acid content from 0.02to 6.47% were transesterified with methanol using potassium hydroxide as a catalyst in a batch-stirred reactor.Biodiesel yield and ester content were independent of the type of vegetable oil, but both decreased when thevegetable oil acid value increased due to the neutralization of the free fatty acid content in the oil. Yield losseswere also due to triglyceride saponification and methyl ester dissolution in glycerol, according to the materialbalance of the process. On the other hand, the stoichometric potassium hydroxide to neutralize the free fattyacids was added to the amount of potassium hydroxide used as a catalyst for the vegetable oils with thehighest proportion of free fatty acid. In every case, biodiesel met the glyceride concentration specifications,but the process gave much lower yields. The viscosity, peroxide value, and acid value were within EUspecifications for the methyl ester evaluated. The iodine value was above the EU specification for the methylesters from sunflower oil and low erucic B. carinata oil.