LIQUID-FULL HYDROTREATING AND SELECTIVE RING OPENING PROCESSES

摘要

This disclosure relates to liquid-full processes for hydroprocessing a light cycle oil (LCO). The processes involve hydrotreatment followed by selective ring opening in the presence of hydrotreating catalyst and selective ring opening catalyst respectively. The selective ring opening catalyst can be either zeolite ring opening catalyst or amorphous ring opening catalyst. In aspects of zeolite ring opening catalyst, the volume ratio of the total amount of the zeolite ring opening catalyst to the total amount of the hydrotreating catalyst is from about 0.2 to about 1.5. In aspects of amorphous ring opening catalyst, the volume ratio of the total amount of the amorphous ring opening catalyst to the total amount of the hydrotreating catalyst is from about 0.2 to about 3.

主权项

1. A liquid-full process for hydroprocessing a hydrocarbon feed, comprising:
(a) contacting the hydrocarbon feed with (i) a diluent and (ii) hydrogen, to produce a feed/diluent/hydrogen mixture, wherein the hydrogen is dissolved in the mixture to provide a liquid feed, and wherein the hydrocarbon feed is a light cycle oil (LCO) having a polyaromatic content greater than 25% by weight, a nitrogen content greater than 300 parts per million by weight (wppm), and a density greater than 890 kg/m3 at 15.6° C.; (b) contacting the feed/diluent/hydrogen mixture with a first catalyst in a first liquid-full reaction zone, to produce a first product effluent; (c) contacting the first product effluent with a second catalyst in a second liquid-full reaction zone, to produce a second product effluent; and (d) recycling a portion of the second product effluent as a recycle product stream for use in the diluent in step (a)(i) at a recycle ratio of from about 1 to about 10; wherein the first catalyst is a hydrotreating catalyst and the second catalyst is a zeolite ring opening catalyst, the total amount of hydrogen fed to the process is greater than 100 normal liters of hydrogen per liter of the hydrocarbon feed, and the volume ratio of the total amount of the second catalyst to the total amount of the first catalyst is from about 0.2 to about 1.5.