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KMID : 1094720080130040505
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Biotechnology and Bioprocess Engineering
2008 Volume.13 No. 4 p.505 ~ p.510
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Estimating and improving cold filter plugging points by blending biodiesels with different fatty acid contents
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Jeong Gwi-Taek
Park Jae-Hee
Park Seok-Hwan
Park Don-Hee
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Abstract
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Biodiesels are alkyl esters produced by transesterification of higher fatty acids (aliphatic chains composed of 14 to 22 carbon units) from animal fats and/or vegetable oils. The cold filter plugging points (CFPP) of biodiesels are not only higher than that of petro-diesel, but they also differ from the melting point of the raw (unesterified) materials. In this study, we empirically derived equations that estimated the CFPP of a biodiesel based on its fatty acid content, using various biodiesel blends containing four methyl esters with different fatty acid compositions: soybean (SME), palm (PME), rapeseed (RME), and lard (LME). These blending ratio experiments yielded three equations that described the correlation between CFPP and fatty acid content: Y (CFPP, °C) = ?3.1X (blending ratio) ? 12.7 (PME/SME); Y = 2.2X ? 10.7 (LME/SME); and Y = ?4.0X ? 13.0 (PME/RME). We also obtained the correlation between CFPP and total saturated fatty acid methyl ester content in the biodiesels: Y (CFPP, °C) = 0.449X (total saturated fatty acid methyl ester content, wt%) ? 9.198. These empirical equations accurately predicted CFPP values of biodiesel compounds with known fatty acid compositions, facilitating the use of diverse biodiesels in industrial fields.
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KEYWORD
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biodiesel, transesterification, cold filter plugging point, prediction
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