Preparation of Superior Coal-tar Pitch from a High-Temperature Coal Tar by Solvent Extraction

J.-S. Zhou Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), China University of Mining & Technology, Xuzhou, Jiangsu, China

X.-Y. Wei Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), China University of Mining & Technology, Xuzhou, Jiangsu, China

Y.-P. Zhao Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), China University of Mining & Technology, Xuzhou, Jiangsu, China

Y.-Q. Dou Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), China University of Mining & Technology, Xuzhou, Jiangsu, China

X.-S. Cong Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), China University of Mining & Technology, Xuzhou, Jiangsu, China

Z.-M. Zong Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), China University of Mining & Technology, Xuzhou, Jiangsu, China

X. Fan Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), China University of Mining & Technology, Xuzhou, Jiangsu, China

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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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Notes

^aBy difference; daf = dry and ash-free base; M_ad = moisture; A_d = ash.

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Preparation of Superior Coal-tar Pitch from a High-Temperature Coal Tar by Solvent Extraction

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Preparation of Superior Coal-tar Pitch from a High-Temperature Coal Tar by Solvent Extraction

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