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Biodiesel from animal fats with methanol and ethanol was produced in the  presence of sodium methoxide and sodium ethoxide as catalysts. Two samples of  pork fats and one natural beef tallow were directly transesterified with a  good final product yield; 87.7%, 86.7% and 86.3% for methanolysis and 78.4%,  82.6% and 82.7% for ethanolysis, respectively. Methyl ester content was also  determined, being higher than 96.5 wt. % for all the samples prepared, the  presence of natural C17:0 in animal fats makes it necessary to correct the  method proposed in the standard EN 14103 (2003). Biodiesel density at 15 oC  of the samples was between 870 and 876 kg/m3, within the acceptance range of  standard EN 14214, dynamic viscosity at 40 oC of the produced biodiesels, in  the range of 4.5 to 5.16 mm2/s, also fulfills requirements of EN 14214  standard. The iodine value is much lower than the superior limit established  by EN 14214 standard but oxidation stability (OSI) is lower than the required  limit, 6 h, of the standard, which can be attributed to the lack of natural  antioxidants in tallows.

Methanolysis and ethanolysis of animal fats: A comparative study of the influence of alcohols