Study On The Extracts Of Special Coal-Cannel And Its Technology

The extracts of special coal(Huangling cannel)and its extracting technology was studied. Selecting ED, DMAC－CS2, NMP－CS2 and DMF-CS2 extracted the coal in mild conditions by circumfluence extraction. The best technology parameters were found by the orthogonal design. The optimal parameters of ED and DMF-CS2 were just the same (0.054mm,45℃,48h), but the optimums of DMAC-CS2 and NMP-CS2 were 0.064mm,50℃,48h, and 0.064mm,40℃,48h respectively. The extracted yields of the coal in ED, DMAC－CS2, NMP－CS2 and DMF-CS2 was 21.56%,23.12%,25.38% and 30.50% in turn. The coal, its residues and extracts were analyzed by SEM, TG, DSC, FTIR and GC-MS. It was shown that the small molecular substance in coal was extracted in general. Solvent extraction made the hole structure of the coal increasing. Thermal stability of the coal residues declined. A majority of the extracts were aliphatic hydrocarbons, but mineral and aromatics enriched in the coal residues. There were three kinds of substance in the extracts. Aliphatic compounds, in which the principal components belonged to C21~C29 normal alkanes, were dominant in extracts. It also contained some iso-alkane and cycloalkane. Heterocyclic compounds included heterocyclic nitrogenous compounds and heterocyclic sulfo-compounds. Only very small amounts of the aromatics were detected. Some compounds in extracts could be used in medicament and organic synthesis.