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Heteroatom-containing species in the coal liquid oils (CLO) were identified and quantified by the aid of gas chromatography with atomic emission detector (GCAED). Four different CLOs from different rank coals, processes and cut points were investigated in the present study. Thiophene and its derivatives were found to be the major sulfur compounds, pyridines and anilines, and phenols were the major nitrogen and oxygen compounds, respectively in the oils of boiling range < 300 ℃. An oil of boiling range (300 – 420℃) carried more dimethyldibenzothiophenes and benzoquinolines. The correlation between feed coal and liquid product was discussed in terms of the compositions of heteroatomic compounds. Kata kunci: coal liquid oil, heteroatomic compounds, GC-AED

MOLECULAR COMPOSITION OF COAL LIQUID OIL CHARACTERIZED BY GAS CHROMATOGRAPHY WITH ATOMIC EMMISION DETECTOR