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利用柱层析和高压差示扫描法研究了6种加氢基础油烃类组成与氧化安定性的关系。结果表明:大庆石化分公司石蜡基原油生产的加氢基础油和兰州石化分公司中间基原油生产的加氢基础油的抗氧化性能较差。铁对基础油的氧化有明显的催化作用,随着铁含量的增加,基础油起始氧化温度迅速下降。基础油起始氧化温度与铁含量有负的线性相关性。在铁存在下,基础油中环烷烃含量越高,起始氧化温度下降越多,氧化安定性越差。基础油柱层析组分的PDSC氧化安定性测试以及反添加试验结果表明,轻芳烃的存在对加氢基础油氧化安定性有负面影响,中芳烃和多芳烃的存在有助于提高加氢基础油的氧化安定性。
The relationship between hydrocarbon composition and oxidation stability of six hydrogenated base oils was studied by column chromatography and high pressure differential scanning. The results show that the hydrogenation base oil produced by paraffinic crude oil of Daqing Petrochemical Company and the hydrogenated base oil produced by intermediate base crude oil of Lanzhou Petrochemical Company have poor oxidation resistance. Iron has a significant catalytic effect on the oxidation of base oil. With the increase of iron content, the initial oxidation temperature of base oil decreases rapidly. The initial linear oxidation temperature of the base oil has a negative linear correlation with the iron content. In the presence of iron, the higher the naphthene content in the base oil, the lower the initial oxidation temperature, the worse the oxidation stability. The PDSC oxidation stability test and reverse addition test results of the base oil column chromatography components show that the presence of light aromatic hydrocarbons has a negative impact on the oxidation stability of hydrogenated base oil. The presence of medium aromatic hydrocarbons and polyaromatic hydrocarbons helps to improve the hydrogenation basis Oxidation stability of oil.