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选用褐煤、气煤和肥煤３个煤阶共５个煤种，着重从岩相角度研究了它们在二硫化碳－Ｎ－甲基－２－吡咯烷酮混合溶剂中的溶解特性．结果表明，在宏观煤岩组分方面，５种煤的溶解性均按亮煤＞暗亮煤＞亮暗煤＞暗煤＞丝炭的顺序减小，而镜煤在这一顺序中的位置则因是否含有壳质组分而不同；在显微煤岩组分方面，溶解性则是镜质组＞壳质组＞惰质组，镜质组中一般又以无结构镜质体溶解性最大，但随着煤变质程度的加深而逐渐与其它镜质组组分趋于一致．此外，矿物质对煤的溶解性也产生影响．
A total of 5 coal rankings, lignite, gas coal and fat coal, were selected. The dissolution characteristics of these coal co-solvents in carbon disulfide-N-methyl-2-pyrrolidone were studied emphatically. The results show that in terms of macroscopic coal and rock components, the solubility of five kinds of coal are reduced according to the sequence of bright coal> dark coal> bright dark coal> dark coal> filament coal, and the position of mirror coal in this sequence Due to whether it contains chitin components are different; in terms of micro-coal rock components, the solubility is vitrinite> chitin> inertinite group, the vitrinite group is generally non-structural vitrinolysis The largest, but with the deepening of coal metamorphism gradually with other vitrinite components tend to be consistent. In addition, the solubility of coal minerals also have an impact.