Processes for recovering hydrocarbons from a drag stream from a slurry hydrocracker
First Claim
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1. A process for recovering hydrocarbons from a hydrocracking zone, the process comprising:
- cracking a feed stock in a hydrocracking zone to produce a converted hydrocarbon stream, the hydrocracking zone comprising a slurry hydrocracker;
withdrawing an effluent stream from the slurry hydrocracker in the hydrocracking zone;
passing the effluent stream to a high pressure separator;
removing a drag stream taken from a bottom half of the slurry hydrocracker in the hydrocracking zone, the drag stream comprising a mixture of catalyst, coke, converted hydrocarbons, and unconverted hydrocarbons;
separating the drag stream into a vapor portion and a liquid portion, the vapor portion of the drag stream comprising converted hydrocarbons; and
,separating HVGO from the liquid portion of the drag stream with a solvent in a deashing zone.
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Abstract
A process for recovering hydrocarbons from a slurry hydrocracking reactor. The hydrocarbons are recovered by taking a drag stream of the slurry in the reactor. After separating lighter hydrocarbons in a separation zone, the heavier hydrocarbons can be processed in a deashing zone, with a vacuum column bottoms from a separation of the effluent stream recovered from the reactor. The deashing zone can recover the heavier hydrocarbons in a deashed pitch. Additionally, a VGO rich stream from the deashing zone may be recycled back to the reactor.
12 Citations
19 Claims
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1. A process for recovering hydrocarbons from a hydrocracking zone, the process comprising:
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cracking a feed stock in a hydrocracking zone to produce a converted hydrocarbon stream, the hydrocracking zone comprising a slurry hydrocracker; withdrawing an effluent stream from the slurry hydrocracker in the hydrocracking zone; passing the effluent stream to a high pressure separator; removing a drag stream taken from a bottom half of the slurry hydrocracker in the hydrocracking zone, the drag stream comprising a mixture of catalyst, coke, converted hydrocarbons, and unconverted hydrocarbons; separating the drag stream into a vapor portion and a liquid portion, the vapor portion of the drag stream comprising converted hydrocarbons; and
,separating HVGO from the liquid portion of the drag stream with a solvent in a deashing zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A process for recovering hydrocarbons from a hydrocracking zone, the process comprising:
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removing a drag stream taken from a bottom half of a slurry hydrocracker in a hydrocracking zone; passing the drag stream to a first separation zone, the drag stream comprising a mixture of catalyst, coke, converted hydrocarbons, and unconverted hydrocarbons; separating the drag stream in the first separation zone into a vapor portion and a liquid portion, the vapor portion of the drag stream comprising converted hydrocarbons; separating the liquid portion of the drag stream in a second separation zone into an HVGO stream and a pitch stream; withdrawing an effluent stream from the slurry hydrocracker in a hydrocracking zone; and passing the effluent stream to a third separation zone having a high pressure separator, the third separation zone being different from the first separation zone and the second separation zone. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A process for recovering hydrocarbons from a hydrocracking zone, the process comprising:
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removing a drag stream taken from a bottom half of a slurry hydrocracker; separating the drag stream in a first separation zone into a vapor portion and a liquid portion, the drag stream comprising a mixture of catalyst, coke, converted hydrocarbons, and unconverted hydrocarbons, and wherein at least a portion of the vapor portion of the drag stream comprises converted hydrocarbons; withdrawing an effluent stream from the slurry hydrocracker; separating the vapor portion of the drag stream and a portion of an effluent stream from the slurry hydrocracker into a C4−
hydrocarbon stream and a C5+ hydrocarbon stream, the effluent stream being different than the drag stream;recycling a portion of the C5+ hydrocarbon stream back to the slurry hydrocracker; deashing the liquid portion of the drag stream with a solvent in a deashing zone to provide a dried solids, a deashed pitch and an HVGO stream; and
,recycling the HVGO stream back to the slurry hydrocracker.
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Specification