Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 2, Pages 1044-1050Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2010.08.029
Keywords
Fatty acid methyl esters; Optimization; Unsaturation degree; Chain length; Response surface methodology
Funding
- Spanish Ministry of Science and Education [ENE2007-65490/ALT]
- Ministry of Science and Innovation [HI2008-0229, TRA2009-_0265_02, ENE2009-14522-C05-03]
- Junta de Andalucia, Spain [TEP-4994]
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Presence of unreacted glycerides in biodiesel may reduce drastically its quality. This is why conversion of raw material in biodiesel through transesterification needs to readjust reaction parameter values to complete. In the present work, monitoring of glycerides transformation in biodiesel during the transesterification of vegetable oils was carried out. To check the influence of the chemical composition on glycerides conversion, selected vegetable oils covered a wide range of fatty acid composition. Reactions were carried out under alkali-transesterification in the presence of methanol. In addition, a multiple regression model was proposed. Results showed that kinetics depends on chemical and physical properties of the oils. It was found that the optimal reaction temperature depends on both length and unsaturation degree of vegetable oils fatty acid chains. Vegetable oils with higher degree of unsaturation exhibit faster monoglycerides conversion to biodiesel. It can be concluded that fatty acid composition influences reaction parameters and glycerides conversion, hence biodiesel yield and economic viability. (C) 2010 Elsevier Ltd. All rights reserved.
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