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 |
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.
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