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孤岛减压渣油加氢脱硫后所得残渣油（＞５００℃）的化学组成与原料渣油明显不同，饱和分、轻芳烃、中芳烃显著增加，饱和分与芳烃占８３％，而原料渣油中这两个组分仅占４１％。加氢残渣油的硫含量远低于原料的硫含量，残余硫主要集中在重胶质和沥青质中，且主要是硫醚硫，其中脂硫醚硫约占一半，说明在高压加氢条件下，渣油中噻吩类化合物的主要脱硫途径是先加氢生成相应的硫醚，然后进一步氢解脱硫。
The chemical composition of residue oil (> 500 ℃) obtained after the hydrodesulfurization of island vacuum oil residue is obviously different from that of the raw material residue. The content of saturated, light aromatic and mid-aromatic hydrocarbons increases significantly, while the content of saturated and aromatic hydrocarbons accounts for 83% The two components accounted for only 41%. The content of sulfur in the hydrogenation residue oil is far lower than the sulfur content of the raw materials. The residual sulfur mainly concentrates in the heavy gum and asphaltene, and is mainly thioether sulfur, of which the content of the sulfur is about half, indicating that under high pressure hydrogenation conditions , The main desulfurization method of thiophene compounds in the residue is to hydrogenate the corresponding thioether and further to hydrogenolysis desulfurization.