超临界萃取法对渣油加氢前后金属含量分析研究

Study on Analysis of Metal Content in Residual Oil by SFEF

以高硫劣质渣油为原料,在渣油加氢处理反应器上对减压渣油进行加氢处理,得到渣油加氢生成油。对原料渣油和渣油加氢生成油分别进行超临界流体萃取分离,按质量收率10%分割成几个不同的组分,研究反应前后各个组分中金属含量的变化。减压渣油经过超临界流体萃取分馏后,大部分金属都集中在残渣中,说明超临界流体萃取分馏对金属有较好的选择性。减压渣油在所确定的工艺条件下经过加氢处理,所得渣油加氢生成油进行超临界流体萃取分馏。结果表明,残渣中金属所占的比例增加,相当于金属进一步在残渣中"浓缩"。随着加氢的进行,金属脱除,渣油中很难脱除的Ni和V在各个组分间的分布发生变化,馏分油中的金属所占的比例减少,而残渣中的金属所占的比例增加,未能脱除的金属主要浓缩在残渣中,这部分浓缩于残渣中的金属很难脱除。

The inferior high-sulfur residue was hydrotreated in the reactor. The vacuum residue and the output were respectively separated into several fractions by the yield of 10%（mass） in the supercritical fluid extraction and fractionation（SFEF）. The metal content of each fraction was studied. The vacuum residue was separated into several fractions by the SFEF. Most of metal was concentrated in the residue fraction, which can indicate that SFEF has good selectivity of the metal. Under the optimum conditions, the vacuum residue was hydrotreated in the reactor, and the output was separated into several fractions by the SFEE The results show that the proportion of metal in the residue fraction increases, so as that the metal is further concentrated in the residual fraction. After hydrotreating, the distribution of metal in every fraction is changed. The proportion of the metal in the distillate fractions reduces, while the proportion of the metal in the residual fraction increases. The metal left mainly exists in the residual fraction, and the removal of it is difficult.