Abstract
Different antioxidant effects of adding tert-butylhydroquinone (TBHQ) to biodiesel in different processes of biodiesel production were investigated by determining oxidation stability during the biodiesel production process. The induction time of biodiesel prepared from waste animal and vegetable oils containing 0.10 wt% TBHQ was 10.9 h at 110 °C, the induction time increased with the increase of TBHQ concentration. While the antioxidant effect of adding the same concentration of antioxidant TBHQ was weakened with the extension of storage time (before TBHQ was added), the oxidation stability of the biodiesel decreased by 53.6% after 18 hours' placement. Similarly, when TBHQ was added in the production process, the induction time also extended with the increase of TBHQ concentration. With 0.06 wt% TBHQ added in the distillation process, the oxidation induction time of biodiesel obtained was 9.7 h, with 0.06 wt% TBHQ added in the reaction process, the oxidation induction time of biodiesel obtained was 14.27 h. As expected, for the same concentration, TBHQ displayed the highest effectiveness when added in the reaction process and showed better efficacy when used in the distillation process compared to adding in store stage.
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