Influence of asphaltene content on yield and properties of hydrotreated residue

The influence of asphaltene contents on the yield and properties of hydrotreated residue was studied in an autoclave by using the residue of Tahe deasphalted oil (DAO) mixed with different contents of asphaltene. The results show that the yield of hydrotreated residue and the ratio of the asphaltene in hydrotreated residue plus coke to the asphaltene in feedstock decrease with the increasing of asphaltene content. The asphaltene can be converted to light oil more easily at the selected reaction conditions when the asphaltene content in feedstock is high. The molecular weight, the H/C mol ratio, the sulfur content, the aromatic fraction and the resin of the hydrotreated residue decrease. However, the density, the nitrogen content, the saturation fraction and the asphaltene increase for the hydrotreated residue. The removal rate of sulfur and nitrogen first increases and then decreases with the increasing of asphaltene content in feedstock.