Department of Chemical Physics and Applied Thermodynamics, EPS, Edificio Leonardo da Vinci, Campus de Rabanales, Universidad de Cordoba, 14071 Cordoba, Spain.
Bioresour Technol. 2011 Jan;102(2):1044-50. doi: 10.1016/j.biortech.2010.08.029. Epub 2010 Aug 10.
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.
生物柴油中未反应的甘油酯的存在可能会大大降低其质量。这就是为什么需要调整原料在通过酯交换转化为生物柴油过程中的反应参数值使其完全转化。在本工作中，监测了在植物油的酯交换过程中生物柴油中甘油酯的转化。为了检查化学成分对甘油酯转化率的影响，选择的植物油涵盖了广泛的脂肪酸组成。反应在甲醇存在下进行碱酯交换。此外，还提出了一个多元回归模型。结果表明，动力学取决于油的化学和物理性质。结果发现，最佳反应温度取决于植物油脂肪酸链的长度和不饱和度。不饱和程度较高的植物油具有更快的单甘油脂转化为生物柴油。可以得出结论，脂肪酸组成影响反应参数和甘油酯转化率，从而影响生物柴油的产率和经济可行性。
