US 11,859,142 B2
Hydrocracking process for maximization of naphtha
Yoga Ramamurthi Ayar, Buffalo Grove, IL (US); Rajesh Sivadasan, Nootdorp (NL); Richard Hoehn, Mount Prospect, IL (US); and Donald A. Eizenga, Elk Grove Village, IL (US)
Assigned to UOP LLC, Des Plaines, IL (US)
Filed by UOP LLC, Des Plaines, IL (US)
Filed on Apr. 30, 2021, as Appl. No. 17/245,269.
Prior Publication US 2022/0348832 A1, Nov. 3, 2022
Int. Cl. C10G 65/10 (2006.01); C10G 67/06 (2006.01); C10G 65/12 (2006.01); C10G 65/14 (2006.01)
CPC C10G 67/06 (2013.01) [C10G 65/10 (2013.01); C10G 65/12 (2013.01); C10G 65/14 (2013.01); C10G 2300/4081 (2013.01); C10G 2400/04 (2013.01); C10G 2400/06 (2013.01); C10G 2400/10 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A hydrocracking process for maximization of naphtha while producing base oil comprising:
hydrocracking a hydrocarbon feed stream in a first stage hydrocracking reactor in the presence of a hydrogen stream and a hydrocracking catalyst to produce a first hydrocracked effluent stream;
separating the first hydrocracked effluent stream in a separator to provide a vapor hydrocracked stream and a liquid hydrocracked stream;
fractionating the liquid hydrocracked stream in a first stage fractionation column to provide a naphtha stream, a kerosene stream, a diesel stream and a first unconverted oil stream;
recycling a recycle stream comprising one, two or all of a portion of the kerosene stream, a portion of the diesel stream, and a portion of the first unconverted oil stream to a second stage hydrocracking reactor to provide a second hydrocracked effluent stream;
fractionating the second hydrocracked effluent stream in a second stage fractionation column to provide a second unconverted oil stream;
withdrawing a remaining portion of the first unconverted oil stream for base oil production; and
withdrawing a UCO drag stream comprising about 0.1 wt % to about 5 wt % of said hydrocarbon feed stream from said second unconverted oil stream.