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基于黔西—滇东5套镜煤及其CS2抽余物的等温吸附实验和傅里叶变换红外光谱(FTIR)结果,对比分析了原煤及抽余物的吸附特征和结构官能团特征,探讨了CS2抽提对煤吸附性改造的地球化学机理.结果表明:CS2的抽提作用改变了煤吸附性特征,其改变方向和幅度受煤化作用程度高低控制;抽提作用减小了煤中产烃相关结构官能团和含氧官能团等2类结构官能团含量,其减小幅度同样取决于煤化作用程度高低.发现第2次煤化作用跃变对镜煤抽余物吸附性改变及其结构官能团含量改变起关键作用,镜煤抽余物的吸附性改变和其2类结构官能团含量改变差值之间具有同步响应.认为具有产烃相关结构官能团特征的烷烃及芳烃等非极性分子的溶出增强了煤抽余物吸附性,具有含氧结构官能团特征的非烃和沥青质等极性分子的溶出减弱了煤抽余物的吸附性,煤化作用程度控制下CS2抽提作用对煤中2类结构官能团含量的改变是其吸附性改变的根本原因.
Based on the isothermal adsorption experiments and Fourier transform infrared spectroscopy (FTIR) results of 5 sets of mirror coal and its CS2 leftover from Qianxi-East Yunnan, the adsorption characteristics and structural functional groups of raw coal and raffinate were analyzed comparatively CS2 extraction of coal adsorption reforming geochemical mechanism.The results show that: CS2 extraction changes the characteristics of coal adsorption, the direction and magnitude of its change is controlled by the degree of coalification; extraction to reduce the coal-related hydrocarbon production Structural functional groups and oxygen-containing functional groups and other two kinds of functional groups content, its reduction also depends on the extent of the degree of coalification. The second coalification transition was found to be the key to changes in the adsorption capacity of the coal residue and its structural functional group content changes , There is a synchronous response between the adsorption change of the mirror coal residue and the difference of the change of the content of the functional groups of the type 2. It is considered that the dissolution of nonpolar molecules such as alkanes and aromatic hydrocarbons having the characteristics of the hydrocarbon- Residue adsorbability, the dissolution of polar molecules such as non-hydrocarbons and asphaltenes having oxygen-containing functional groups, weaken the adsorbability of coal leachables. Under the control of coalification degree, CS2 pumping The change of functional group content of two kinds of structure in coal is the basic reason for the change of adsorption.