Patent ID: 11859142
Assignee: UOP LLC
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 12:
13. 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 first hydrogen stream and a distillate selective catalyst to produce a first hydrocracked effluent stream;
separating the first hydrocracked effluent stream in a first stage fractionation column to provide a vapor hydrocracked stream and a liquid hydrocracked stream;
fractionating the liquid hydrocracked stream to provide a naphtha stream, a kerosene stream, a diesel stream and a first unconverted oil stream;
recycling 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;
hydrocracking a second unconverted oil stream and a recycle stream comprising the portion of the kerosene stream, the portion of the diesel stream, and the portion of the first unconverted oil stream in the second stage hydrocracking reactor in the presence of the naphtha selective catalyst and a second hydrogen stream to produce a second hydrocracked effluent stream;
separating the second hydrocracked effluent stream in a second stage fractionation column to provide the 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 2 wt % of said hydrocarbon feed stream from said second unconverted oil stream.