Structural features of Qitaihe high-temperature coal tar by sequentially fractional extraction

ABSTRACT

A coal tar was sequentially extracted with petroleum ether, methanol, butanone, carbon disulfide, and isometric butanone/carbon disulfide mixed solvent to afford extracts 1 to 5 (E₁ to E₅) under ultrasonic irradiation in a batch extraction system, respectively. All of the extracts were analyzed with Fourier transform infrared and gas chromatography/mass spectrometer. Results showed that 18 compounds were detected in E₁, including 17 condensed arenes varying from one to five rings and 1 organooxygen compound. A series of heteroatom-containing organic species were enriched to large extents in E₂; and 16 compounds were detected in E₃, including 13 condensed arenes, 1 organosulfur compound, and 2 organonitrogen compounds. Organic species in E₄ and E₅ with molecular weight beyond the measurement range of gas chromatography/mass spectrometer were identified using Fourier transform infrared. Possible structures of some highly condensed aromatic species were inferred.

KEYWORDS:

• Coal tar
• fractional extraction
• organic compounds
• structural feature

Additional information

Funding

This work was subsidized by the Special Fund for Major State Basic Research Project (Grant 2011CB201302) and the Fund from National Natural Science Foundation of China for Innovative Research Group (Grant 50921002).