The Change Rule Of Extraction Ratio And Group Composition On The Different Coal Body Structure After Extracted

Based on solvent extraction method, the paper presents an experimental investigation on the extraction yields and group compositions of coal samples, which were formed in different tectonic conditions, exampled by anthracite from Sihe coal mine of Qinshui Basin, Shanxi province. The solvent extraction experiments were carried out by three solvents, including benzene, THF and NMP. By means of column chromatography, the group compositions of the extraction were separated and quantitatively measured. The paper investigates the change law of extraction yields and group composition.The research result shows that the extraction yields have an increasing tendency with the increase of the damage extent of coal body structure. For series of coal samples, the majorities of soluble parts can be dissolved out of coal under the twice extraction of each solvent. The extraction power of NMP solvent is highest, followed by that of THF and then that of benzene. With the increases of the deformed extent of coal body structural, the content saturated hydrocarbon and asphaltene of the extraction has the decreasing trend, but the relative content of the aromatic hydrocarbons and non-hydrocarbon shows the increasing tendency. Further study shows the the hydrocarbon content comparatively decreases, but the content of aromatics and asphalt to increase as a whole bituminous and non-hydrocarbons content present the change rule of overall increase. The study concludes the content of group compositions extracted from coal is not only influenced by the damage extent of coal body structure, but also concerned with the solvent properties.