Energy Sources Part A-recovery Utilization and Environmental Effects, Vol.34, No.1-4, 64-71, 2012
Preparation of Superior Coal-tar Pitch from a High-Temperature Coal Tar by Solvent Extraction
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 (E-1 to E-5). All the extracts were analyzed with gas chromatography/mass spectrometry. As the heaviest extract, E-5 mainly consists of condensed arenes with five or more rings according to gas chromatography/mass spectrometry analysis. Lighter components were removed from E-5 by ultrasonic extraction with petroleum ether and subsequent rotary distillation in a vacuum up to 300 degrees C. The lighter components-free E-5 proved to be a high quality coal-tar pitch by analysis with an XP-203E hot stage polarizing microscope.