小桐子生物柴油在氧化期间的特性分析

Analysis on the Characteristics of Jatropha Curcas Biodiesel During Oxidation

本研究通过Rancimat法加速氧化实验进行生物柴油氧化特性研究,并采用气相色谱-质谱联用仪(GC-MS)分析氧化期间的成分组成变化。研究结果表明:在小桐子生物柴油的加速氧化期间主要是含碳碳双键的脂肪酸甲酯被氧化,氧化期间会有醛、酮、分子质量较高的含氧化合物及其可溶性聚合物生成;小桐子生物柴油的氧化使其C和H的含量降低导致热值降低12.8%;小桐子生物柴油的氧化产物使其润滑性能变差,磨斑直径增加幅度较大,从184.14μm增至441.86μm;小桐子生物柴油的密度和运动黏度伴随着氧化分别增加3.3%和20.8%。

Oxidative stability is important for the development of bio - diesel and commercial applications. In this paper, the oxidative properties of biodiesel were studied through the Rancimat method, and the composition of the components during oxidation was analyzed by GC - MS. The results showed that： during the accelerated oxidation of Jatropha curcas biodiesel, fatty acid methyl esters containing mainly carbon - carbon double bonds are oxidized and aldehydes and ketones, higher molecular weight oxygenates and soluble polymers are formed during oxidation during oxidation; the oxidation of biodiesel reduced the contents of C and H, resulting in a decrease of 12.8% in calorific value. The oxidation products of Jatropha curcas biodiesel deteriorated its lubricating properties, and the diameter of the scar increased significantly from 184.14 μm to 441.86μm. The density and kinematic viscosity of biodiesel in- creased by 3.3% and 20.8% with oxidation, respectively.