Biomarkers of Inta coal deposit, isolation and analysis of chemical structure of hypercoals

We studied the possibility of production of ashless coals (hypercoals) from raw of Intinskaya mine. To study the formation conditions of the initial coals by gas chromatography and gas chromatography-mass spectrometry we studied the composition of biomarkers hydrocarbons of saturated fraction of bitumen. The presence of high concentrations of C29 steranes, C27-C29 n- alkanes indicates a significant contribution of terrigenous vegetation in the initial biomass composition; for a number of samples the presence of high concentrations of C23-C25 n- alkanes can be an attribute of the contribution of aquatic vegetation in the initial biomass composition. To produce hypercoals the initial coal concentrates were extracted with N-methylpyrrolidone at boiling. To characterize the product, obtained after distillation of the solvent, we used solid state NMR spectroscopy. The analysis of CP/MAS spectra, and also the results of the editing of the spectra showed that the obtained hypercoals are little different from the initial coals by their organic matter structure. At that they are characterized by an insignificant increase of aliphatic component and presence of amido groups conditioned by the interaction with the solvent.