| With soybean biodiesel as raw material, effect factors of oxidative stability of soybean biodiesel such as unsaturation, preparation process and storage process of soybean biodiesel were studied through Rancimat rancidity method.The results showed that the lower unsaturation of soybean biodiesel,the better oxidative stability of soybean biodiesel; the higher methanol residue and moisture residual in soybean biodiesel, the worse oxidative stability of soybean biodiesel, and the glycerol residue had little effect on the oxidative stability of soybean biodiesel, so moisture residual in soybean biodiesel should be lower than 0.05%, and methanol residue should be less than 0.2%. As the temperature increased, the oxidation induction time of soybean biodiesel shortened quickly. As the air flow rate increased, the oxidation induction time of soybean biodiesel descended linearly. Metal ion was catalyst in oxidative degradation of soybean biodiesel, and oxidation of soybean biodiesel was easier in case of light and aeration, so soybean biodiesel should be stored in carbon steel container with less metal ion at low temperature and environmental conditions were lucifugal and stuffiness. |
