Investigation of original preasphaltene and asphaltene in coal
- East China Univ. of Science and Technology, Shanghai (China)
- China Univ. of Mining and Technology, Xuzhou (China)
- Chinese Academy of Science, Taiyuan (China). Inst. of Coal Chemistry
The preasphaltene (PA) and asphaltene (A) from untreated coal show a direct relationship of PA/A (w/w) to the carbon content of coal. Their thermal stability was investigated by in-situ pyrolysis FTIR, and the results show that PA is more stable than A. Five types of hydrogen bonds formed by hydroxyl were observed by means of vacuum FTIR, and their thermal stability was found to be OH{pi} < self-associated OH < OH-ether {le} tightly bonded cyclic OH {approx_equal} OHN. The insolubility of PA in benzene and A in hexane was determined by the hydrogen bonding associated strength of acid/base components in them, but not their structure parameters and molecular weight. The acid/base associated strength of preasphaltene and asphaltene is estimated in the following ranges, asphaltene, < 5.15kJ/mol; preasphaltene, 5.15--30.9kJ/mol.
- OSTI ID:
- 324862
- Report Number(s):
- CONF-970931--
- Country of Publication:
- United States
- Language:
- English
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