文献类型：期刊文献

英文题名：Evaluation of Coal Extraction with Supercritical Carbon Dioxide/1Methyl-2-pyrrolidone Mixed Solvent

作者：Sun, Ye[1];Wang, Xingjun[1];Feng, Tingting[1];Yu, Guangsuo[1];Wang, Fuchen[1]

机构：[1]E China Univ Sci & Technol, Minist Educ, Key Lab Coal Gasificat & Energy Chem Engn, Shanghai 200237, Peoples R China

年份：2014

卷号：28

期号：2

起止页码：816

外文期刊名：ENERGY & FUELS

收录：;EI(收录号：20141017417648);WOS:【SCI-EXPANDED(收录号:WOS:000331861800010)】；

基金：This research is supported by the National Key State Basic Research Development Program of China (973 Program, Grant 2010 CB 227000). The authors thank Professor Ling Zhao and Professor Dexiang Zhang for providing part of the analytical instruments.

语种：英文

外文关键词：Supercritical fluid extraction - Pore size - Carbon dioxide - Solvents

摘要：A novel coal extraction method using supercritical carbon dioxide (scCO(2))/1-methyl-2-pyrrolidone (NMP) mixed solvent, which has the advantages of high efficiency, diffusibility, separability, and environmental friendliness, is proposed in this paper. The physical and chemical properties of the extracts and residues in scCO(2)/NMP mixed solvent extraction of coal were studied. The results showed that 8 bituminous coals had relatively higher extraction yields. The bituminous coal with 85.12% carbon content had the maximum observed extraction yield. The mixed solvent of scCO(2) and NMP had a good extractability for hydroxyl-rich substances, oxygen, sulfur, and other heteroatom-containing compounds. The extracts of Bei Su (BS) and Qu Jin (QJ) coals with higher extraction yields contained more aromatic ring structures. Studies of coal structure revealed that BET surface area of residues were generally lower than that of raw coals, especially for low-rank coals. After extraction, BET and pore volume declined whereas the pore size increased with increasing pressure. It could also be concluded that stacking heights of four coals (QJ, BS, Nan Lu Tian, and Yang Chang Wan) decreased after the extraction procedure. The degree of decline of NLT lignite was larger than that of other coals according to the carbon minicrystal research. A microcrystalline structure similar to raw coal was formed in the process of the solvent evaporation, with a lower stacking height and a higher interplanar spacing. The gasification reactivities of the four coals have been improved by the extraction with scCO(2)/NMP mixed solvent, especially for QJ and BS coals, which have high extraction yields.