Citation:
MA Lun, LU Da-rong, LIANG Han-dong, ZHU Shu-quan, DING Yi, LI Shan, CHEN Yu-fei. Preliminary study on macromolecular structure characteristics of Shenhua long flame coal[J]. Journal of Fuel Chemistry and Technology,
;2013, 41(5): 513-522.
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By using ASE 350 (Accelerated Solvent Extraction) Shenhua long flame coal was extracted with mixed solvent of carbon disulfide/N-methyl pyrrolidone (CS2/NMP) under high temperature and high pressure, and the extraction rate was about 25%. The extracted residue was degraded by ruthenium ion catalytic oxidation (RICO), then the products were examined with IC and GC/MS, which depends on thermal auxiliary-methyl esterification of tetramethyl ammonium hydroxide (TMAH, 25% methanol solution). The results show that the macromolecular structure of Shenhua coal contains alkyl side chains at a length of C2~28 and alkyl bridge between aromatic rings at a length of C2~22. The aromatic condensation level is relatively low (most are conjugated structure of 2~4 benzene rings). And there are many ether linked aromatic structures, oxygen groups like hydroxyl (-OH), carbonyl (C=O), methoxy (-OCH3), and heteroatom compounds with sulfur and nitrogen.
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Keywords:
- Shenhua long flame coal,
- solvent extraction,
- RICO,
- GC-MS
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