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论文类型：期刊论文

发表时间：2015-03-01

发表刊物：JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS

收录刊物：SCIE、EI

卷号：112

页面范围：113-120

ISSN号：0165-2370

关键字：Lignite; Tetrahydrofuran extraction; Pyrolysis; Tar; GC; NMR

摘要：Based on the host-guest model of coal, the fixed and mobile phase of coal which can be separated by solvent extraction will present different characteristics during thermal conversion. The pyrolysis of Xilinguole and Huolinhe lignites and their extraction residues with tetrahydrofuran were investigated at 450-700 degrees C under N-2 atmosphere. The results indicate that the temperature at the maximum tar yield of extraction residue is lower than that of coal. Compared with raw coal, residue pyrolysis process exhibits lower water yield, higher gas yield and similar char yield. Similar H-2 yield, more CO and CO2 yields but less CH4 yield are obtained during residue pyrolysis than those in coal pyrolysis. GC analysis of tar shows that contents of phenols and mononuclear aromatics from residue tar are higher than those from raw coal tar. H-1 NMR and C-13 NMR of tar indicate that the tar from residue has higher aromaticity factor than that from coal. The total acidity and acid distribution in raw coal, extraction residue and their chars obtained at 600 degrees C show that phenolic -OH is the main oxygen contained group in extract. The activity of O in coal could be improved by extraction, and more O will be translated to -OH during pyrolysis. (C) 2015 Elsevier B.V. All rights reserved.