Process for hydrocracking a feed stream

Abstract

A process of hydrocracking a feed stream is provided. The hydrocracking process comprises hydrocracking a feed stream in a hydrocracking reactor over a hydrocracking catalyst in the presence of a hydrocracking hydrogen stream at hydrocracking conditions to open at least 95 vol % of all rings present in the feed stream to produce a hydrocracked effluent stream that is aliphatic. The feed stream to the hydrocracking process may comprise more than one feedstock. The feed stream to the hydrocracking process may comprise a petroleum origin feed or a bio-based feed or a combination of both.

1 . A process of hydrocracking a feed stream, comprising:
 hydrocracking a feed stream in a hydrocracking reactor over a hydrocracking catalyst in the presence of a hydrocracking hydrogen stream at hydrocracking conditions to open at least 95 vol % of all rings present in said feed stream to produce a net hydrocracked effluent stream that is aliphatic.   
     
     
         2 . The process of  claim 1  wherein said rings comprise naphthene rings and aromatics rings. 
     
     
         3 . The process of  claim 1  further comprising:
 fractionating said hydrocracked effluent stream to produce an overhead stream and a bottoms stream comprising heavy naphtha; and 
 recycling said bottoms stream. 
 
     
     
         4 . The process of  claim 3 , wherein said bottoms stream has a T90 temperature of about 176° C. to about 260° C. 
     
     
         5 . The process of  claim 3 , wherein said bottoms stream comprises at least 0.01 wt % HPNA. 
     
     
         6 . The process of  claim 3 , wherein the hydrocracking reactor is a two-stage hydrocracking reactor comprising a first stage hydrocracking reactor upstream of fractionation and a second stage hydrocracking reactor downstream of fractionation. 
     
     
         7 . The process of  claim 6  further comprising charging said bottoms stream to the second stage hydrocracking reactor, wherein said bottoms stream comprises less than about 30 wt % aromatics. 
     
     
         8 . The process of  claim 1 , wherein said hydrocracking conditions comprise an LHSV of about 0.3 to about 1.0 hr −1 . 
     
     
         9 . The process of  claim 1 , wherein said net products in the hydrocracked effluent stream is at least 98 vol % aliphatic. 
     
     
         10 . The process of  claim 1 , wherein a hydrocracked stream is passed through an interstage separation step before passing to a downstream hydrocracking reactor bed. 
     
     
         11 . The process of  claim 6  further comprising:
 separating said hydrocracked effluent stream into a first vapor stream and a first liquid stream; 
 fractionating the first liquid stream to provide said bottoms stream; and 
 passing said bottoms stream to the second stage hydrocracking reactor. 
 
     
     
         12 . A process of hydrocracking a feed stream, comprising:
 hydrocracking a feed stream comprising one or more of a naphtha stream, a kerosene stream, a diesel stream, a gas oil stream, deasphalted oil stream, a pyrolysis oil stream, and a pyrolysis gasoline stream, in a hydrocracking reactor over a hydrocracking catalyst in the presence of a hydrocracking hydrogen stream to open at least 95 vol % of all rings present in said feed stream and produce a hydrocracked effluent stream;   fractionating said hydrocracked effluent stream to produce an overhead stream and a bottoms stream comprising heavy naphtha; and   hydrocracking said bottoms stream.   
     
     
         13 . The process of  claim 12  wherein said rings comprise naphthene rings and aromatics rings. 
     
     
         14 . The process of  claim 12  wherein said bottoms stream is hydrocracked in a separate hydrocracking reactor than the feed stream. 
     
     
         15 . The process of  claim 12 , wherein the hydrocracking reactor is a two-stage hydrocracking reactor comprising a first stage hydrocracking reactor upstream of fractionation and a second stage hydrocracking reactor downstream of fractionation. 
     
     
         16 . The process of  claim 15  further comprising recycling said bottoms stream to the second stage hydrocracking reactor, wherein said bottoms comprises less than about 30 wt % aromatics. 
     
     
         17 . The process of  claim 12 , wherein said hydrocracked effluent stream is at least 98 vol % aliphatic. 
     
     
         18 . A process of hydrocracking a feed stream, comprising:
 hydrocracking a first feed stream comprising one or more of a kerosene stream, a diesel stream, a gas oil stream, a deasphalted oil stream, pyrolysis gasoline stream, and a pyrolysis oil stream and a second feed stream comprising a naphtha stream or a butane stream in a hydrocracking reactor over a hydrocracking catalyst in the presence of a hydrocracking hydrogen stream to produce a hydrocracked effluent stream.   
     
     
         19 . The process of  claim 18 , wherein the hydrocracking reactor is a two-stage hydrocracking reactor comprising a first stage hydrocracking reactor and a second stage hydrocracking reactor, and wherein a first stage hydrocracked effluent stream is passed without separation to the second stage hydrocracking reactor. 
     
     
         20 . The process of  claim 18  wherein at least 95 vol % of all rings present in said first feed stream and said second feed stream are opened to produce said hydrocracked effluent stream.