赤外線吸収スペクトル法による潤滑油基油中の全芳香族成分含有量の定量
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Determination of total aromatic content in lubricating oil stocks by infrared absorption method was investigated. The following conclusions were obtained from the experimental results.<BR>1) Four representative lubricating oil stocks A, B, C and D were separated into two main components, saturated hydrocarbons and aromatic hydrocarbons respectively by silica gel adsorption chromatography. Standard samples containing 1050wt% aromatics were prepared by adding aromatic hydrocarbons to saturated hydrocarbons obtained in chromatography.<BR>Linear calibration curves were obtained from the aromatic contents and the infrared absorbances at near 1, 613cm<SUP>-1</SUP> of standard samples. And also, it was found that there are linear correlation between molecular weight of samples and gradient of their calibration curves.<BR>2) Total aromatic contents in various lubricating oil stocks produced at the refinery in this country and foreign country from same crude oil were determined by chromatographic method and infrared absorption method. As a result, analytical values from these method agreeded with one another within ±3% by relative error.<BR>3) As this procedure is simple and rapid (10min/one sample), this is considered as a very useful method for routine analysis.
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