In this research biodiesel is produced from goat tallow in the presence of homogenous catalysts such as KOH and NaOH using trans-esterification process. For this purpose, effect of several parameters such as temperature, reaction time, methanol to oil ratio, type and concentration of a catalyst has been investigated. The results showed that the maximum biodiesel yield (96 and 98 %) was obtained using NaOH and KOH, respectively, and optimal conditions were determined. Also, to improve some properties of biodiesel, biodiesel was mixed with diesel at different ratio (B5-B100) and their properties such as flash point, cloud point, pour point, viscosity and density were measured. It was found that the properties of produced biodiesel is in the range of standard and can be used as a biofuel.
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