Abstract
Hitherto, the chemical structure of coal derived oil was represented to oversimplification as the hypothetical mean structure. In this review, a more detailed assessment was made by the presentation of the actual profile with the distribution of chemical structure. This procedure consists of a separation by GPC/ DS (distillation) and HPLC for coal oils into specific chemical constitution having a homologus ring cluster and a narrow molecular weight distribution. Subsequently the structural analysis was conducted by a low voltage MS method to these fractions.
Fundamental information for the separation behavior of amine column as packing material on HPLC, GPC and the distillation fractionation was presented in the coal oil fractions separated by preparative LC/GPC/DS as reference materials because these fractions are chracterized previously in the chemical structure by MS analyses. Struc tural analyses of DS-HPLC fractions by LV-MS spectra are described for the assign ment of compound types by Z numbers and for quantitative estimation of these contents.
Presentation of structural results are subjected to a three dimensional diagram for aromatic ring numbers (Ra), naphthenic ring numbers (Rn) and alkyl carbon numbers attached to these rings (Cal). Coal oil derived from hydrogenolysis of Akabira coal (C%: 83.0) was estimated for the structural distribution of compound type and assessed by Ra-Rn-Cal diagram to characterize the chemical structure.
