石炭液化油中の含窒素化合物の分析法

Abstract

Of the numerous chemical species that are generally present in coal-derived products, the nitrogen-containing polycyclic aromatic compounds have been found to exhibit pronounced carcinogenic and mutagenic effects in biological system. As a result considerable emphasis is currently being placed on the identification and the determination of the nitrogen-containing polycyclic compounds. On the other hand, identification and quantitation of the nitrogen-containing compounds is important to evaluate denitrogenation properties of liquefaction catalysts and to determine the amenability of the liquefaction product to further processing. Nitrogen-containing compounds are present in various chemical forms. This complexity has led to the development of a wide variety of analytical methods aimed at achieving improved separation for characterization of coal liquid.A multi-step analytical methodology for the separation and identification of nitrogen-con-taining compounds has been developed in our laboratory. The integrated multi-stage separation method employs aqueous extraction of basic nitrogen compounds followed by gel permiation chromatography with subsequent thin layer chromatography. The combination of these techni-ques produces fractions which are chemically much less complex than the starting crude materials. Then this method facilitates the subsequent characterization of coal liquid. In this review, some methods for characterization of azaarenes in these fractions based on information from the retention values obtained in various chromatographic methods and the fluorescence spectra in addition to mass spectra.