Retardation effect of nitrogen compounds and condensed aromatics on shale oil catalytic cracking processing and their characterization

摘要

Untreated shale oil, shale oil treated with HC1 aqueous solution and shale oil treated with HC1 and furfural were used to do comparative experiments in fixed bed reactors. Nitrogen compounds and condensed aromatics extracted by HC1 and furfural were characterized by elec-trospray ionization Fourier transform cyclotron resonance mass spectrometry and gas chromatography and mass spectrometry, respectively. Compared with untreated shale oil, the conversion and yield of liquid products increased considerably after removing basic nitrogen compounds by HC1 extraction. Furthermore, after removing nitrogen compounds and condensed aromatics by both HC1 and furfural, the conversion and yield of liquid products further increased. In addition, N1 class species are predominant in both basic and non-basic nitrogen compounds, and they are probably indole, carbazole, cycloalkyl-carbazole, pyridine and cycloalkyl-pyridine. As for the condensed aromatics, most of them possess aromatic rings with two to three rings and zero to four carbon atom.