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    Title: Comparison Of Biodiesels Produced From Waste And Virgin Vegetable Oils
    Authors: Hung, Yi-shun' Chen, Yi-hung;Shang, Neng-chou;Chang, Cheng-hsin;Li, Tsung-lung;Chang, Ching-yuan;Shie, Je-lueng
    Contributors: 淡江大學土木工程學系
    Keywords: Biodiesel;waste vegetable oil;esterification;transesterification;fuel properties
    Date: 2010-11
    Issue Date: 2012-10-09 10:05:51 (UTC+8)
    Publisher: Chinese Institute of Environmental Engineering
    Abstract: In this study, a two-step process (acid catalyzed esterification followed by alkali catalyzed transesterification) was employed to convert waste vegetable oil (WVO), which showed the free fatty acids of 1.33 wt%, acid value of 2.66 mg KOH g-1, and the kinematic viscosity at 40 °C of 39.5 mm2 s-1, into the biodiesel. The WVO biodiesel was synthesized under the following conditions: the methanol to oil molar ratio of 6, the H2SO4 catalyst dosage of 0.5 wt% based on the oil weight, and the reaction temperature of 45 °C for the acid catalyzed esterification; the methanol to oil molar ratio of 9, the KOH catalyst dosage of 2 wt% based on the oil weight, and the reaction temperature of 60 °C for the alkali catalyzed transesterification. The acid values of the esterified WVO and the WVO biodiesel were determined as 1.42 and 0.18 mg KOH g-1, respectively. In addition, a single-step process (alkali catalyzed transesterification) was used to convert virgin vegetable oil (VVO) to biodiesel for comparison. These two oils were successfully converted to biodiesel while the ester contents of the WVO and VVO biodiesels were 98.8% and 99.3%, respectively. As a result, the WVO biodiesel had less polyunsaturated fatty acid methyl esters, higher kinematic viscosity, and lower oxidation stability compared to those of the VVO biodiesel. Furthermore, the fuel properties of two biodiesels can satisfy most biodiesel standards except the cold filter plug point and oxidation stability.
    Relation: Sustainable Environment Research 20(6), pp.417-422
    Appears in Collections:[土木工程學系暨研究所] 期刊論文

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