Spectral Analysis and Evaluation of Shanshan Coal Tar

doi:10.11938/cjmr20160109

Abstract

Abstract:

The composition and structure parameters of coal tar distilled from the coal of the Shanshan area, Xinjiang were studied by NMR spectroscopy and Fourier transform infrared (FT-IR) spectrometry. With the structure parameters calculated from the spectra, and coalification degree and hydrocarbon generation capacity of the crude coal were evaluated. The result showed that the average rate of aromatic carbon (f_ar^C) was 0.44, carbon number (N) was 2.87, replace index (s) was 0.33 and condensation index (Q) was 0.74. It was found that there were many alkyl-side chains connecting to the condensation aromatic nuclei. Five IR parameters (B₁~B₅) were chosen to process the spectra with vector normalization and integral in the Ominic software. The NMR and IR data indicated that the crude coal is medium in metamorphic grade, and belongs to humic coal mainly composed of vitrinite. The oxygen-containing functional groups exist mainly in the form of aryl ethers. Carboxyl and methoxy groups either fall out or disappear. According to the hydrocarbon generation mechanism, these data indicated that the gas potentiality of the coal tar is higher than its oil potential; and the gas potential carbon is mainly the methyl units.

Key words: NMR, FT-IR, structure parameters, coal tar, Shanshan

CLC Number:

O482.53

HONG Kun, MA Feng-yun, ZHAO Xin, ZHONG Mei, LIU Jing-mei, LIU Yue-e, HE Lu. Spectral Analysis and Evaluation of Shanshan Coal Tar[J]. Chinese Journal of Magnetic Resonance, 2016, 33(1): 96-105.

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