The Possible Uses ofAntioxidant to Increase Oxidation Resistance of Biodiesel Synthesized from[arak-pagar(jatropha curcas L.) Seed Oil

The experiment has been done to look into the utilization of [atropa curcas oilfor biodiesel as the alternative of the fossil-based diesel oil through the es/rans (esteri.fication and transesteri.fication) process and the use of antioxidants.The estrans process brought about favorable changes in the oil characteristicvs(e,g,the decreases in density, viscosity, acid number, and iod number), thereqy enhancing itsperformance as biodiese/.Three kinds of antioxidantswere used (i.e.TBHQ, BHT, and Formula X), each with varying concentrations (0. 03-0. 10%), and storage duration were imposed from thefirst until fourth week.The examined responses comprised of peroxide number, acid number, and kinematic viscosity.Reaching thefourth week, however, the oxidationprocess still occurred to the biodieseloil despite using antioxidants(slight increases in peroxide number, acid number, and kinematic viscosity),but with the intensityfarless than that of the control biodiesel (without antioxidant). The antiokxidant regarded as the most effective inhibiting such oxidation was TBHQ, followed in decreasing order qy BHT and Formula X. However,the Formula X could expectedfyperform as effectivefy as TBHQ and BHT, but with higher concentration (>0.10%).The characteristics of biodiesel either the control or with antioxidants (upto thefourth week duration) could still satisfy the SNI criteria and those offossil-based dieseloil.