Analysis of the composition of thermolysis products of ash-free concentrates obtained on the basis of oil shale of the Ayuvinskoye deposit (Komi Republic)

The treatment with N-methylpyrrolidone of sedimentary rocks of the Ayuvinskoye deposit allowed obtaining ash-free concentrates with different yields, depending on the Corg content in the rock. The structure of the resulting concentrates was studied by elemental analysis, thermogravimetry, and pyrolysis, followed by analysis of the products by gas chromatography-mass spectrometry. The TGA curves indicated similar structural features of the organic matter of the rocks and the concentrates obtained from them. The composition of the thermolysis products of the concentrate indicated the preferential extraction of aliphatic structures, represented by n-alkyl chains, relative to aromatic fragments, which was associated with the specific structure of the initial organic matter of solid fossil fuels.