HYDROPROCESSING FOR DISTILLATE PRODUCTION

摘要

Methods are provided for hydrotreating a feed to generate a product with a reduced or minimized aromatics content and/or an increased distillate product yield. A distillate boiling range feed having an elevated content of sulfur and/or nitrogen can be hydrotreated using at least two hydrotreating stages with intermediate separation to produce a hydrotreated distillate boiling range product with a reduced or minimized aromatics content. Additionally or alternately, a mixed metal catalyst formed from a suitable precursor can be used during the hydrotreating. A mixed metal catalyst formed from a suitable precursor can provide an unexpectedly superior activity for aromatic saturation. A still further unexpected benefic can be achieved by combining a multi-stage hydrotreating process with intermediate separation with hydrotreating in the presence of a mixed metal catalyst formed from a suitable precursor.

主权项

1. A hydrotreating process comprising:
reacting a feedstream having a sulfur content of at least about 3000 wppm and a T90 boiling point of about 900° F. (482° C.) or less in a first hydrotreating stage in the presence of a hydrogen-containing treat gas and in the presence of at least one first stage hydrotreating catalyst, the first hydrotreating stage being operated at first stage hydrotreating conditions, to produce a first liquid effluent having a sulfur content of about 5000 wppm or less, the sulfur content of the first liquid effluent being less than the sulfur content of the feedstream; separating the first liquid effluent to produce a first vapor phase stream and a first liquid product stream; reacting at least a portion of the first liquid product stream in a second hydrotreating stage in the presence of a hydrogen-containing treat gas and a second hydrotreating catalyst, the second hydrotreating stage being operated at second stage hydrotreating conditions to produce a second liquid effluent; and separating the second liquid effluent to produce a second vapor phase stream and a second liquid product stream having a sulfur content of about 500 wppm or less, wherein about 15 wt % or less of the feedstream is converted relative to a conversion temperature of 350° F. (177° C.) during the reacting in the first hydrotreating stage and the second hydrotreating stage.