石炭液化油オイル成分のＨＰＬＣ‐ＦＩＤ法による化合物クラスの分布

Abstract

The distributions of compound classes in coal-derived oil were investigated by high performance liquid chromatography (HPLC) and thin layer chromatography equipped with a flame ionization detector (TLC/FID).Neutral oils, free of the acidic and the basic portion, were separated into 5 compound classes Fr-P (alkanes), Fr-M (monoaromatics), Fr-D (diaromatics), Fr-T (tri-or tetraaromatics) and Fr-PP (polyaromatics or hetero compounds). Separations were performed by HPLC using a Zorbax BP-NH2 column, as reported previously. Quantitative distributions of these compound classes were estimated by FID, compared with the conventional gravimetric method.In order to accurately determine the contents of compound classes, it is necessary to examine the sensitivity of FID response. The sensitivities of FID for compound classes with a larger number of aromatic rings, such as Fr-T and Fr-PP, were higher than those of compound classes with smaller number of aromatic rings, such as Fr-P, Fr-M and Fr-D. The contents were estimated by using the calibration curves, which give the relationhips between contents and signal intensities of FID (TLC peak area in this case) for each compound class. Consequently, distributions of compound classes with parent coal C% by FID agrees fairly well with those according to the gravimetric method.It is concluded that the HPLC-FID method is useful for characterization of coal-derived neutral oil. So, routine quantitative analyses can be carried out relatively easily by this method.