Component Analysis of Coal-derived Heavy Oil -Analysis of Carcinogenic Components in Neutral Nonpolar Fractions-

Abstract

The components of the neutral nonpolar fraction of the coal-derived heavy oil were analyzed in detail and carcinogenic components were determined quantitatively.
The heavy distillate (bp 340-400°C) of the solvent-trea ted coal was separated into neutral (86.0%), acidic (6.4%) and basic fractions (2.2%). The neutral fraction was devide d into seven fractions using dual-packed liquid chromatography (Fig.1). Nonpolar fractions (Fr 1-6)were analyzed by a new techniq4e combining capillary GC-MS, retention index (RI) for capillary GC and HPLC-fluorescence methods. The methods were effective for identification of isomeric polycyclic aromatic hydrocarbons (PAHs) and their quantities were determined by capillary GC.
Components more than 95.5 % of the neutral fraction were identified. Normal paraffins (C₁₇-C₃₄), mono-, di-, tri- and tetracyclicnaphthene nonpolar (C₁₂-C₁₉) and thirty a romatic ring systems ranging from monocyclic to hexacyclic rings were identified (Table 2 and 4-6). The components were increased in the order of normal paraffins (17.2% in the neutral fraction) >C₀-C₄--substituted phenanthrene (12.8%) >C₀-C₄ pyrene (11.1%)>C₁-C₆ acenaphthene(7.2%) >C₀-C₄ 4, 5-dihydropyrene (5.9%) >C₀-C₆ fluorene(4.7%) >C₀-C₄ benzofluorene (three isomers, 4, 5%) >C₀-C₄ chrysene(3.0%).
Carcinogenic components such as chrysene, benz[a]anthracene, benzo[a]pyrene and dibenz [a, h]anthracene systems were concentrated in Fr 6 and constitute 3.3% of the neutral fraction (Table 7).