几种合成抗氧化剂对菜籽生物柴油的抗氧化作用

Antioxidation of synthesized antioxidant on rapeseed biodiesel

采用碱催化甲醇转酯化法制备菜籽生物柴油(RME),通过气相色谱法测定样品中脂肪酸甲酯的分布与含量,样品中脂肪酸甲酯总量达98%,符合欧盟生物柴油质量标准要求。在该RME样品中分别添加0.04%、0.08%、0.12%3个不同水平的TBHQ、BHT、BHT与BHA等量混合物3种不同的抗氧化剂,置于(63±2)℃的培养箱中,加速其氧化,定时取样检测样品过氧化值、酸值,考察上述3种抗氧化剂的抗氧化效果及其最适添加量。研究表明,对RME而言,不同种类的抗氧化剂有不同的最适添加量;添加量相同时,不同种类的抗氧化剂表现出不同的抗氧化效果,且在不同时期内其抗氧化效果有所差异;0.08%TBHQ对RME的抗氧化效果最好。

Rapeseed biodiesel（RME）was synthesized with the catalyst of alkaline. The total fatty acid methyl esters in RME were 98% by GC analysis.The antioxidation of TBHQ,BHT,compound of BHT and BHA to RME were compared by using schaal oven method at （63±2）℃.The results showed that the best content of antioxidant was different,and the antioxidation of different antioxidant was different when the content was the same.The antioxidation of TBHQ with 0.08% dosage was the best.