煤及其溶剂萃取产物的氮气吸附行为

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