To obtain a deep understanding of the pyrolysis mechanism of oil shale kerogen, critical organic intermediate——thermal bitumen was firstly prepared by heating Fushun oil shale up to the critical temperature point (450℃), and then extracted by IL(BmimCl) which was mixed with NMP. Scanning electron microscope, X-ray diffraction, Fourier transform infrared spectrophotometry and flash pyrolysis-gas chromatography-mass spectrometry were employed to investigate the physical and chemical transformation in oil shale pyrolysis and extraction processes. Results showed that thermal bitumen was mainly composed of aliphatic structures. In the thermolysis and extraction courses, aliphatic structures have poor stability by comparison of peak intensities. Thermal bitumen mainly comprised short and middle-chain alkanes/alkenes in the range from C4 to C26.
Keywords oil shale, Ionic liquid, thermal bitumen, structure