title: Influence of vegetable oils fatty acid composition on reaction temperature and glycerides conversion to biodiesel during transesterification.
abstract: 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.
authors.affiliation: Department of Chemical Physics and Applied Thermodynamics, EPS, Edificio Leonardo da Vinci, Campus de Rabanales, Universidad de Cordoba, 14071 Cordoba, Spain.
authors.forename: S
authors.initials: S
authors.lastname: Pinzi
authors.forename: L M
authors.initials: LM
authors.lastname: Gandía
authors.forename: G
authors.initials: G
authors.lastname: Arzamendi
authors.forename: J J
authors.initials: JJ
authors.lastname: Ruiz
authors.forename: M P
authors.initials: MP
authors.lastname: Dorado
mesh_terms: D000704:Analysis of Variance; D056804:Biofuels / Q000032:analysis*; D004951:Esterification; D005227:Fatty Acids / Q000032:analysis* / Q000737:chemistry*; D005989:Glycerides / Q000737:chemistry*; D008956:Models, Chemical; D010938:Plant Oils / Q000737:chemistry*; D012044:Regression Analysis; D013696:Temperature; D013997:Time Factors
chemical_list: D056804:Biofuels; D005227:Fatty Acids; D005989:Glycerides; D010938:Plant Oils