Study of biodiesel production from animal fats with high free fatty acid content
2011
Encinar, J.M. | Sánchez, N. | Martinez, G. | García, L.
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 89.0wt.% ester content was obtained by acid-transesterification (9wt.%H₂SO₄, 6:1 methanol:fats molar ratio, 60°C, 48h). Pre-esterification conditions were studied for different fats and acid catalysts: 0.5wt.%H₂SO₄ or 1.0wt.%p-TsOH, 6:1 methanol:fats molar ratio, 65°C and 4h 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 97.3wt.% ester content. Biodiesel quality was evaluated and most of properties were well within EN 14214.
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