基于气相色谱法的油酸甲酯热氧化降解动力学研究

Thermal oxidative degradation kinetics of methyl oleate based on GC

为了考察油酸甲酯的热氧化降解特性,采用自制的氧化模拟装置将样品加速氧化,定时取样,利用气相色谱测定油酸甲酯在不同温度下的氧化曲线;通过Rancimat法加速氧化试验,测定了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,利用微分法和积分法获得了相应动力学参数,确定了反映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 to study the oxidative degradation property of methyl oleate under the conditions of different temperature. The degradation degrees of oxidative oil were determined by GC. In addition, the induction period of methyl oleate was determined by the Rancimat method. A simple series reaction models were 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 equations have been established, which could be used for other unsaturated fatty acid methyl ester thermal oxidation deterioration contained in biodiesel for further establishment of biodiesel thermal oxidation deterioration kinetic model.