Performance improvement of blends of tung oil-waste oil based biodiesel.

Tung oil based biodiesel was blended with waste oil based biodiesel(1:1(V:V))to improve the quality.Effects of antioxidants such as tert-butylhydroquinone(TBHQ),butyl-4-methylphenol(BHT)and butylated hydroxyanisole(BHA)on the oxidation stability and other properties of blend were investigated.Change of viscosity and peroxide value of blends were also studied under accelerated oxidation condition.Results indicated that blending tung oil based biodiesel with waste oil based biodiesel made a balance between the properties of two biodiesels,so that viscosity of tung oil based biodiesel was decreased and fluidity of waste oil based biodiesel was increased.TBHQ showed better antioxidative activity than BHT and BHA,and the addition of TBHQ exhibited little effect on other properties.The blends can meet national standard of GB/T 20820-2007 When 1% TBHQ was added.The peroxide value and viscosity of blend had increased after oxidization,and TBHQ inhibited the change.