Abstract
Mono-aromatic ring fractions in coal-derived oils were separated into several fractions by high-performance liquid chromatography (HPLC) equipped with carbon packed column (Carbonex, TONEN). Any obtained fractions had a wide molecular weight distribution with same molecular weight compounds each other. This results showed that the carbon packed column separation was due to structural differences of isomers for alkylated aromatic hydrocarbons. Using HPLC equipped with carbon packed column as a separation method of coal-derived oils would be suitable for an analysis of isomeric aromatic components.