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在经典的润滑油潜含量测定过程中 ,使用柱色谱法来分离样品。该分离方法耗时长 ,有机试剂用量大。本课题结合超临界流体萃取的制备特性和色谱的分离特性 ,在萃取池中加入既能作为样品载体又能作为烃类分离介质的吸附剂 ,用超临界 CO2 作流动相 ,用改性剂将润滑油馏分萃取分离为饱和烃 (链烷烃和环烷烃 ,P+ N)、轻芳烃 (A1 )、中芳烃 (A2 )、重芳烃 +胶质 (A3+胶质 ) 4部分。本方法的分离效果接近于柱色谱法 ,且无环境污染、仪器操作简单、重复性好。
In the classical determination of oil latent levels, column chromatography was used to separate the samples. The separation method takes a long time and the amount of organic reagent is large. Combining with the preparative characteristics of supercritical fluid extraction and the chromatographic separation characteristics, this topic is to add the adsorbent which can both serve as the sample carrier and as the separation media of hydrocarbon, using supercritical CO2 as the mobile phase, Lube oil fraction is extracted and separated into 4 fractions of saturated hydrocarbons (paraffins and naphthenes, P + N), light aromatic hydrocarbons (Al), medium aromatic hydrocarbons (A2), heavy aromatics + gums (A3 + gums). The separation of this method is close to the column chromatography, and no environmental pollution, the instrument is simple and reproducible.