亚油酸甲酯热氧化衰变动力学研究

Study on Thermal Oxidative Deterioration Kinetics of Methyl Linooleate

为了考察亚油酸甲酯的热氧化衰变特性,采用自制氧化模拟装置将样品加速氧化,定时取样,利用气相色谱测定亚油酸甲酯在不同温度下的氧化曲线;通过Rancimat法加速氧化实验,测定了亚油酸甲酯的氧化诱导期;同时采用一个简单连串反应模型,求出了反应速度方程的积分形式,并且分别利用微分方程法和积分法对反应速度方程式的参数进行了计算,进而确定了反映亚油酸甲酯热氧化降解历程的宏观反应动力学方程式,为进一步建立生物柴油高温热氧化衰变模型提供数据支持。

The accelerated oxidation reaction was carried out on an oxidation simulator in order to study the oxidative deterioration property of methyl linoleate under conditions of different temperature. The oxidative curves were determined by GC. In addition, the induction period of methyl linoleate was determined by the Rancimat method. A simple series reaction model was adopted for simulating the oxidation process. The integration equation was obtained for the first-order series reaction, and the parameters of the kinetic equations were calculated by both the integral method and the differential equation method. Thus, the macro-kinetic equationswere established, which could be used for the establishment of thermal oxidation deterioration kinetic model of biodiesel.