添加剂对橡胶籽油生物柴油氧化稳定性的改进

测定了橡胶籽油的物化性能及组成. 加入6种抗氧化剂，采用Rancimat法研究了其添加量及复配、温度、0#柴油添加量、金属铜、铁等对橡胶籽油生物柴油氧化稳定性能的影响. 结果表明，橡胶籽油所制生物柴油不饱和脂肪酸含量达82.1%，诱导期为0.81 h，达不到国家标准(6 h). 6种抗氧化剂在添加量为4000′10-6(w)时对橡胶籽油生物柴油的氧化稳定性能均有提升，其中TBHQ效果最好，使其氧化稳定性诱导期达13.09 h，6种抗氧化剂的抗氧化效果为TBHQ>BHT>D-TBHQ>OG>PG>BHA. PG与其他抗氧化剂复配后效果较好，而TBHQ与其他抗氧化剂复配后效果降低. 温度和0#轻柴油添加量对橡胶籽油生物柴油的氧化稳定性能影响很大，随温度升高，诱导期明显缩短，而随0#柴油添加量增大，诱导期增加，添加量较大时诱导期增幅很大. 铁、铜对其氧化稳定性能也有一定影响.

Improvement of Oxidative Stability of Rubber Seed Oil Biodiesel with Additives

Physical and chemical properties and fatty acid composition of rubber seed oil were measured. Using Rancimat method, the influences of six antioxidants and their addition, blending with any two kinds of antioxidants, temperature and mental copper and iron on the oxidative stability of rubber seed oil biodiesel were studied. The results show that the content of unsaturated fatty acid is 82.1% and the induction period of rubber seed oil biodiesel 0.81 h. The antioxidative effect of the biodiesel is better when the six antioxidants are used. When the TBHQ addition is 4000′10-6 (w), the biodiesel can achieve the national standard of biodiesel, the induction period of thel biodiesel is 13.09 h. The antioxidative effect order of six antioxidants on the biodiesel is TBHQ>BHT>D-TBHQ>OG>PG>BHA. The best antioxidative effect is obtained with PG mixed with other antioxidants. But using TBHQ mixed with other antioxidants will reduce itself antioxidative effect. The measuring temperature and addition of 0# light diesel on the biodiesel greatly affect the oxidative stability. With the increase of measuring temperature, the induction period decreases, but with the increase of 0# light diesel, the induction period prolongs. Copper and iron affect the oxidative stability of the biodiesel.