title: Study of biodiesel production from animal fats with high free fatty acid content.
abstract: The aim of this work was to obtain biodiesel from animal fats, an inedible feedstock. Three different types of fats were used to produce biodiesel; their main characteristic was high free fatty acid content. Animal fats were transesterified with acid catalyst and basic catalyst with and without pre-esterification. Biodiesel of 89.0 wt.% ester content was obtained by acid-transesterification (9 wt.%H2SO4, 6:1 methanol:fats molar ratio, 60 °C, 48 h). Pre-esterification conditions were studied for different fats and acid catalysts: 0.5 wt.%H2SO4 or 1.0 wt.%p-TsOH, 6:1 methanol:fats molar ratio, 65 °C and 4 h made it possible to obtain fats with acid value less than 0.5% FFA. Pre-treatment was effective for fats with different FFA content. Alkali transesterification of esterified fats resulted in a product with 97.3 wt.% ester content. Biodiesel quality was evaluated and most of properties were well within EN 14214.
authors: Departamento de Ingeniería Química y Química Física, Universidad de Extremadura-Avda, Elvas s/n, 06071 Badajoz, Spain. jencinar@unex.es
authors: J M
authors: JM
authors: Encinar
authors: N
authors: N
authors: Sánchez
authors: G
authors: G
authors: Martínez
authors: L
authors: L
authors: García
mesh_terms: D000818:Animals; D056804:Biofuels; D001709:Biotechnology / Q000379:methods*; D002384:Catalysis; D004951:Esterification; D004952:Esters / Q000737:chemistry; D005227:Fatty Acids / Q000032:analysis; D006862:Hydrogen Sulfide / Q000737:chemistry; D000432:Methanol / Q000737:chemistry; D008956:Models, Chemical; D013464:Sulfuric Acids / Q000737:chemistry; D013696:Temperature; D013997:Time Factors
chemical_list: D056804:Biofuels; D004952:Esters; D005227:Fatty Acids; D013464:Sulfuric Acids; C033158:sulfuric acid; D000432:Methanol; D006862:Hydrogen Sulfide