中文摘要：

通过对不同变质程度的两种煤所进行的CS2／NMP混合溶剂萃取，发现该过程并不是单纯的可溶物的溶解，其间有一部分萃取物依靠浮力作用悬浮在溶剂中，在离心分离条件下并不能沉降到萃取残渣中，因此所得的CS2／NMP混合溶剂对某些煤的高萃取率并不是全部由分子意义上的溶解所得．通过向CS2／NMP混合溶剂萃取液中添加反苹取剂的反萃取过程，可以将2种类型的悬浮物高度富集形成固体形态的精煤和黏结组分．提出了煤的嵌布结构理论模型及其概念，认为煤是以大分子组分、中型分子组分（包括中Ⅰ型和中Ⅱ型）、较小分子组分和小分子组分共同组成的混合物，这5种族组分之间主要以镶嵌的分布方式相连接，可以通过CS2／NMP混合溶剂为主的萃取反萃取使其彼此分离．应用该模型可以对萃取过程及现象进行合理解释．

英文摘要：

Two different rank coals were extracted with carbon disulfide and N-melthy-2-pyrolidinone （CS2/NMP） mixed solvent. It was found that the extraction process is not only dissolution of the soluble fraction, but also there is suspension effect, for extraction fraction in the mixed solvent, which couldn＇t deposit in the residue under centrifugal conditions. The high extraction yield of coals with the CS2/NMP mixed solvent is not obtained entirely from the dissolution of molecular scale. By adding back-extractant into the extraction solution, two suspended substances are highly enriched to form two solids： ultra-pure coal and caking components. The coal inbuilt state model and its conception are proposed. Coal is a mixture com posed of five group components： macromolecular components, meso-molecular components （meso-molecular components Ⅰ and meso-molecular components Ⅱ ）, sub meso-molecular components and micro-molecular components. The five group components are connected by the means of inbuilt state distribution and can be separated by CS2/NMP solvent during the extraction and back-extraction process. Finally, the extraction process is rationally explained using the coal inbuilt state structural model.