Abstract
Renewable fuels production got a big boost in recent years. One alternative is the production of vegetable oils with the ability to replace all or partly the diesel fuel derived from oil. The objective of this work was to produce biodiesel from blends of virgin castor oil (VCO) and waste frying oil (WFO) from ethylic route and alkaline catalysis as well as to study the physical and chemical properties. Biodiesel was obtained from 5 different raw materials: VCO (B1), WFO (B2) and three different blends (B3: 50%VCO+50%WFO; B4:25%VCO+75%WFO; B5:75%VCO+25%WFO). The raw materials were evaluated by acidity level, free fatty acids, saponification index and density. For the biodiesel, the index of iodine, cetane, glycerin, absence of triglycerides and rheology was determined. According to the results, all samples were within the specified standard for iodine index and density, but B1 biodiesel showed viscosity and cetane number not allowed in the legislation. Despite the fact thatB4 and B5 results were within the legislation for biodiesel, B4 would be a better alternative due to higher quantity of WFO.
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