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采用超临界流体萃取技术（ＳＣＦＥ），分别将ＶＲＤＳ过程的原料和产物中的减压渣油（＞４９０℃）分离为若干窄馏分，测定了渣油及其窄馏分的组成和性质。考察了孤岛减压渣油的组成和性质在ＶＲＤＳ过程中的变化。结果表明，孤岛减压渣油及其窄馏分的各项性质在ＶＲＤＳ过程中有了很大程度的改善，用改进的Ｂ—Ｌ法和密度法分别对它们的结构参数进行计算。从这些结构参数可以看出，在ＶＲＤＳ过程中，伴随着脱硫、脱氮和脱金属等反应，还发生芳环的加氢饱和、裂化反应和断侧链反应，从而使孤岛减压渣油的结构族组成发生较大的变化。ＶＲＤＳ作为渣油改质技术在重油改质加工中可以发挥重要作用
The vacuum residue (> 490 ℃) in the raw materials and products of VRDS was separated into several narrow fractions by supercritical fluid extraction (SCFE). The composition and properties of the residue and its narrow fractions were determined. The changes of composition and properties of island vacuum residue in the process of VRDS were investigated. The results show that the properties of the island vacuum residue and its narrow fractions have been greatly improved in the VRDS process, and their structural parameters have been calculated by the improved B-L method and the density method respectively. From these structural parameters, it can be seen that in the VRDS process, with the reaction of desulfurization, denitrification and demetallation, the aromatic ring hydrogenation and saturation, cracking reaction and side chain reaction also occur, so that the isolated vacuum residue Structural family composition has undergone major changes. VRDS as a residue reforming technology can play an important role in the reforming of heavy oil