Abstract: Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) was used to analyze and characterize the atmospheric residue obtained from the atmospheric distillation of a blended mixture of Basra light crude oil and Oman crude oil in a volume ratio of 55:45, its slurry bed hydrogenation product, and fixed bed hydrogenation product. The distribution, structure, and hydrogenation conversion laws of nitrogen compounds in the hydrogenation products under the two hydrogenation processes were investigated. The results showed that the non-basic N₁ compounds were the main species during the residue hydrogenation of slurry bed and fixed bed. The side chains breaking effect on nitrogen compounds in the atmospheric residue of the slurry bed hydrogenation process is superior to that of the fixed bed hydrogenation process. The hydrogenation saturation effect on nitrogen compounds in the atmospheric residue of fixed bed hydrogenation process is superior to that of slurry bed hydrogenation process, and it has better removal effect on multi-heteroatom compounds.

Key words: residue, fixed bed hydrogenation, slurry bed hydrogenation, distribution of nitrogen compounds, structure of nitrogen compounds, conversion laws