Stability evaluation of biodiesel supplemented with synthetic and bio-based antioxidants by a pressurized accelerated oxidation method

This work examines pressurized accelerated oxidation by a RapidOxy tester as an alternative method for determination of biodiesel stability. Sunflower oil-based was synthesized and treated with antioxidants: tert-butylhydroquinone (TBHQ) - synthetic antioxidant known its powerful protective effect, mixture bio-based compounds extracted from vinery waste, VWEeth. The potency TBHQ evaluated at varying temperatures (110 140 ?C) concentrations (250 2,000 mg dm-3) the method; assessment selected results performed comparison relevant data obtained standard Rancimat method. VWEeth added in two high dosages to (87,500 150,000 analyzed 140?C Both antioxidants all applied showed beneficial effects on improving oxidative stability biodiesel, but not achieved improvements reached minimum identified EN14214 standard. lowest addition seemed have similar effect tested these additions did increase induction period above limit 8 h; two-fold higher quantity successful this respect, increasing initial factor about 2, which determined both methods. proved be very fast suitable testing large number samples, is particularly important efficient different types doses antioxidants.