加氢润滑油基础油结构组成与氧化安定性关系I.加氢润滑油基础油的物理性质和结构组成

 采用柱色谱、质谱法、1H NMR 、13C NMR和 DEPT 13C NMR等手段详细分析了6种不同基属原油生产的加氢润滑油基础油和1种聚α烯烃（PAO-6）的物理性质和烃类组成。结果表明，各种基础油的S、N含量很低，饱和烃含量很高，芳香烃含量很低；基础油碳类型含量的分布和基础油烃类结构组成影响其黏度指数。正构烷烃和亚甲基含量高的基础油的黏度指数高，而支链甲基和次甲基含量高的基础油黏度指数低；支化度与基础油黏温性能有负的相关性，支化度越大，黏温性能越差，黏度指数越低。不同基属原油生产的润滑油基础油烃类结构符合相应原油特性。

RELATIONSHIP OF OXIDATION STABILITY AND STRUCTURAL COMPOSITION OF HYDROCRACKED LUBRICANT BASE STOCKS I.Physical Properties and Structural Composition of Hydrocracked Lubricant Base Stocks

The physical properties and hydrocarbons composition of six hydrogenated lubricant base stocks from different class crude oils and a poly α-olefin (PAO-6) were detailedly analyzed by using column chromatogram, mass spectrum, 1H NMR, 13 C NMR and DEPT 13 C NMR. The results showed that these base stocks contained much more saturated hydrocarbons and less aromatic hydrocarbons, and also less sulfur and nitrogen. There was a direct proportional relationship between the viscosity index of hydrocracked lubricant base stock and its paraffin hydrocarbons content. High n-alkanes and methylene contents of the base oil corresponded to high viscosity index, and high branched-chain methyl and methylene contents of base stock corresponded to low viscosity index. Branching degree and viscosity-temperature performance of base stock had negative correlation, the greater the degree of branching, the poorer the viscosity-temperature performance, the lower viscosity index. The hydrocarbon structure of base stock was corresponding with the characteristics of crude oil, from which the base sock comes.