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摘要: 用二硫化碳-N-甲基-2-吡咯烷酮（CS2-NMP）(1∶1, V/V) 混合溶剂，以及丙酮和吡啶将云南褐煤和南桐烟煤逐级萃取，去除萃取溶剂后得到各级固态级分。通过ASAP 2010型比表面积及孔快速测试仪，对原煤及萃取级分的氮气吸附行为进行测试，分别用BET模型、线型方程对实验结果进行拟合。结果表明对于萃取率较高的煤，溶剂萃取能较大地增加其孔隙率；煤对氮气的吸附行为遵从Henry定律，因此只需在氮气饱和气压的沸点（77 K）下，测出少数几个压力点的吸附量，就可以得到一条准确的等温吸附线。Abstract: Yunnan lignite and Nantong bituminous coal were extracted with a carbon disulfide-N-methyl-2-pyrrolidinone (CS2-NMP) mixed solvent, actone and pyridine at room temperature in turn,and the solid powders were gained after removal of the solvent. Adsorption behaviors of nitrogen by the coal, its extract fractions and residuals were investigated using Accelerated Surface Area and Porosimetry (ASAP) 2010 apparatus, and the experimental data were fitted by BET equation and y=kx+b. Results showed that solvent extraction can increase the porosity for the coal with high extraction yield, and the nitrogen adsorption behaviors of coal complied with the Henry law.This demonstrated that, at the saturated temperature of nitrogen (77 ),an exact nitrogen adsorption isotherm can be obtained from few data values of adsorption volumes
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Key words:
- coal /
- extract fractions /
- residue /
- adsorption isotherm
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