关键词: 阿曼减压渣油, 柱色谱分离, 烃类组成, 结构参数, 溶解度参数

Abstract: Oman vacuum residues were separated into saturation, light aromatics, middle aromatics, heavy aromatics, light resins, middle resins, heavy resins, and asphaltene by liquid-solid chromatography method, and the hydrocarbon compositions and the molecular structure of each fraction were characterized. Meanwhile, solubility parameters were calculated by the group contribution method and the relation between properties and solubility parameter was correlated. The results indicated that the sulfur distribution of aromatic and resin fractions was relatively uniform, while the vast majority of N(85.05%), CCR(91.95%) and metal(99.85%) were mainly enriched in heavy aromatics, resins and asphaltene; the removal rate of metal(Ni and V) and CCR decreased markedly at the total component yield of 53.8% and 43.8%, respectively, which was important to guide solvent deasphalting process. From saturate to asphaltene, the density (ρ_i), molar volume(Vi) and solubility parameter(δi) increased. In addition, the δ_VR of Oman residue was 17.29 MPa^1/2, between light aromatics and middle aromatics. Compared to S, N, CCR, H/C ratio, density, f_A and R_T, excellent linearity between δ and lnM was shown and the correlation equation was δ=4.7282lnM-14.639.

Key words: Oman vacuum residue, chromatography separation, hydrocarbon composition, structure parameter, solubility parameter