CHEMICAL ANALYSIS OF HIGH ASH BRAZILIAN COAL TAR. 1. PREPARATIVE LIQUID CHROMATOGRAPHIC FRACTIONATION.

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Abstract
A Brazilian high ash coal tar oil has been distilled into six distinct cuts (A to F) which are further fractionated by column liquid chromatography into eight discrete chemical classes (PLC1 to PLC 8). A proper sequence of eluents allows the separation of 5 classes containing hydrocarbons (saturated, olefinic, monoaromatic, diaromatic and polyaromatic), one of intermediate polarity (resins) and two polar fractions (asphaltenes and asphaltols). More than 50% of the oil is verified to distill above 300°C. Infra-red and nuclear magnetic res-sonance spectroscopy confirms the sucess of the group-type fractionation. Very small amounts of hydrocarbons were found, the resins being the major fraction in all cuts studied.