Abstract
A high-temperature coal tar was sequentially extracted in a batch extraction system with petroleum ether, methanol, acetone, carbon disulfide, and isometric acetone/carbon disulfide mixed solvent to afford extracts 1 to 5 (E1 to E5). All the extracts were analyzed with gas chromatography/mass spectrometry. As the heaviest extract, E5 mainly consists of condensed arenes with five or more rings according to gas chromatography/mass spectrometry analysis. Lighter components were removed from E5 by ultrasonic extraction with petroleum ether and subsequent rotary distillation in a vacuum up to 300°C. The lighter components-free E5 proved to be a high quality coal-tar pitch by analysis with an XP-203E hot stage polarizing microscope.
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