Changes in Sub-fractions Properties during Hydrotreating of Residue

摘要

One atmosphere residue was hydrotreated (HDT) in a pilot plant at constant conditions. The properties of the HDT products from a series of reactors and their sub-fractions were characterized by H/C, sulfur, nitrogen, carbon residue, nickel, vanadium, and VPO apparent molecular weight. The removal levels of sulfur, nitrogen, carbon residue, nickel, and vanadium were 84.9 m percent, 51.4 m percent, 62.8 m percent, 84.8 m percent, and 94.0 m percent, respectively. The removal increment of contaminants in reactors was very different during HDT. The ranking of sulfur and nitrogen contents in sub-fractions was asphaltene > resin > aromatic saturate; however, the distribution of sulfur in sub-fractions was aromatic > resin asphaltene > saturate, while that of nitrogen was resin aromatic > asphaltene. Average carbon residue was removed in reactors. Nickel and vanadium were removed mainly in hydrodemetalization reactors.