Chinese Journal of Magnetic Resonance ›› 2006, Vol. 23 ›› Issue (1): 41-47.

• Articles • Previous Articles     Next Articles

Thermally Dissolved Products of Coal-oil Slurry During Direct Coal Liquefaction Studied by NMR Spectroscopy

  

  1. Analysis and Research Center, East China University of Science and Technology, Shanghai 200237
  • Received:2005-03-07 Revised:2005-09-30 Published:2006-03-05 Online:2006-03-05

Abstract:

Studying the composition of product of thermally dissolved coaloil slurry can provide important information on how to control direct coal liquefaction. In this study, Shenhua coal was thermally dissolved in an autoclave using different solvents at different temperatures (250~370 ℃). Solid state 13C CP/MAS/TOSS NMR spectroscopy was used to analyze Shenhua coal, its thermally dissolved products and extracted residue. The results showed that thermal extraction removed oxygen-containing functional groups and some aliphatic hydrocarbon in the Shenhua coal, and fractured a fraction of aromatic bridgehead carbons and nonprotonated carbons. Increasing reaction temperature and continuous supply of hydrogen decreased the aromaticity of the THF extract, but increased the extraction yield.

Key words: solid state NMR, 13C CP/MAS/TOSS NMR, thermally dissolved products, preasphaltene, aromaticity

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