TLC/FID分析原油SARA组成方法研究

Study on SARA Composition of Crude Oil by TLC/FID

以渤海原油为研究对象,建立原油棒状薄层色谱/氢火焰离子化检测器(TLC/FID)族组分分析方法,对原油的四个族组分(饱和烃、芳烃、胶质、沥青,SARA)进行了分析,并对其影响因素展开次数、点样量、展开剂的干燥方式进行了优化,在优化所得条件下,方法的精密度RSD值为3.54%,方法重现性RSD值为3.23%。与文献报道方法相比,本文建立的方法,可将原油中的胶质和沥青两个组分分开,更能全面反应原油的族组成成分,具有分析速度快、有机溶剂用量少、操作简单等特点。最后将建立的方法应用到不同来源的原油中,结果令人满意。

TLC/FID has been used as a rapid and inexpensive way to determine SARA fractions (saturate, aromatic, resin, asphaltene) in crude oils. In this study, SARA analysis was accomplished on an IATROSCAN MK—6s system using silica gel rods. The oil samples from Bohai sea were applied on thin rod of SG which was then separated in typical TLC procedures. The effects of various operational parameters such as times of separation, TLC/FID Chromarod Drying and TLC/FID Chromarod Mass Loading were systematically studied. The precisions of four peak area measurements were found to be better than 3.54%(R. S. D. , n=5). The reproducibility (R. S. D.) of the proposed method, on the basis of peak areas forfive replicate injections, was 3.23%. The TLC—FID technique can produce quantitative measurements of each of the four petroleum fractions which has proven to be a rapid, convenient, and reliable semi—quantitative characterization technique for petroleum compounds. At last, crude oils from different field samples have been analyzed by TLC/FID.